CN116138763A

CN116138763A - Human body impedance measurement method and wearable device

Info

Publication number: CN116138763A
Application number: CN202310363500.0A
Authority: CN
Inventors: 刘云帆; 尤杰
Original assignee: Chipsea Technologies Shenzhen Co Ltd
Current assignee: Chipsea Technologies Shenzhen Co Ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-05-23

Abstract

The embodiment of the application provides a human body impedance measurement method and wearable equipment, wherein the method comprises the following steps: acquiring initial human body impedance by using a first electrode and a second electrode of the wearable device, wherein the first electrode and the second electrode are used for contacting different parts of a user; acquiring the current human body posture; and adjusting the initial human body impedance according to the current human body posture to obtain a target human body impedance. The first electrode and the second electrode of the wearable device are in contact with different parts of the user to obtain initial human body impedance, the current human body posture of the user can be obtained in consideration of the fact that the posture of the user during measurement is not necessarily standard, and the initial human body impedance is adjusted according to the current human body posture, so that adjusted target human body impedance is obtained, and the measurement result is more close to real human body impedance. The problem of inaccurate human body impedance measurement results caused by nonstandard gestures during measurement of a user is solved, and the accuracy of the measurement results is improved.

Description

Human body impedance measurement method and wearable device

Technical Field

The application relates to the technical field of electronics, in particular to a human body impedance measurement method and wearable equipment.

Background

Bioelectrical impedance (Bioelectrical Impedance Analysis, BIA) technology is a non-invasive detection technique that utilizes the electrical properties of biological tissues and organs to extract physiological information. Almost any organism can be analyzed for its constituent composition using BIA technology.

In the related art, the wearable device uses the BIA technology, and contacts both hands of a human body through electrodes on the wearable device to measure impedance of the human body, so as to perform analysis of human body components. However, the user may have various measurement postures at the time of measurement, thereby causing a problem of inaccurate measurement.

Disclosure of Invention

The embodiment of the application provides a human body impedance measurement method and wearable equipment, so as to solve the technical problems.

In a first aspect, embodiments of the present application provide a method for measuring impedance of a human body, which is applied to a wearable device, the method including:

acquiring initial body impedance with a first electrode and a second electrode of the wearable device, wherein the first electrode and the second electrode are used for contacting different parts of a user;

acquiring the current human body posture;

and adjusting the initial human body impedance according to the current human body posture to obtain a target human body impedance.

Optionally, the acquiring the current human body posture includes:

acquiring pre-stored gravity reference information of the wearable equipment;

acquiring gravity measurement information by using a gravity sensor of the wearable device;

and determining the current human body posture according to the gravity measurement information and the gravity reference information.

Optionally, the adjusting the initial human body impedance according to the current human body posture to obtain the target human body impedance includes:

and adjusting the initial human body impedance according to the ratio of the gravity measurement information and the gravity reference information so as to obtain target human body impedance.

Optionally, the acquiring the current human body posture includes:

acquiring distance information between the wearable device and the trunk of the user according to a distance sensor of the wearable device;

and determining the current human body posture according to the distance information, the gravity measurement information and the gravity reference information.

acquiring a pre-stored initial current path between the first electrode and the second electrode;

obtaining a current path according to the distance information, the gravity measurement information and the gravity reference information;

And adjusting the initial human body impedance according to the ratio of the initial current path to the current path so as to obtain target human body impedance.

Optionally, the acquiring the initial body impedance with the first electrode and the second electrode of the wearable device includes:

the first electrode and the second electrode of the wearable device are used for contacting different hands of a user so as to acquire initial human body impedance.

Optionally, the acquiring the current human body posture includes:

acquiring a first relative pose of a user's arms and torso and a second relative pose of a user's forearms and upper arms;

the adjusting the initial human body impedance according to the current human body posture to obtain a target human body impedance includes:

and adjusting the initial human body impedance according to the first relative posture and the second relative posture to obtain the target human body impedance.

In a second aspect, embodiments of the present application further provide a wearable device, including:

the first electrode and the second electrode are used for acquiring initial human body impedance, wherein the first electrode and the second electrode are used for contacting different parts of a user;

and the processor is connected with the first electrode and the second electrode, and is used for acquiring the current human body posture and adjusting the initial human body impedance according to the current human body posture so as to obtain the target human body impedance.

Optionally, the wearable device further comprises:

the gravity sensor is connected with the processor and used for acquiring gravity measurement information;

the processor is also used for acquiring preset gravity reference information and determining the current human body posture according to the gravity measurement information and the gravity reference information.

Optionally, the wearable device further comprises:

a distance sensor for acquiring distance information between the wearable device and the trunk of the user, wherein the distance sensor is connected with the processor;

the processor is further configured to determine a current human posture based on the distance information, the gravity measurement information, and the gravity reference information.

In the embodiment of the application, the first electrode and the second electrode of the wearable device are in contact with different parts of the user to obtain the initial human body impedance, the current human body posture of the user can be obtained in consideration of the fact that the posture of the user during measurement is not necessarily a standard posture, and the initial human body impedance is adjusted according to the current human body posture, so that the adjusted target human body impedance is obtained, and the measurement result is more close to the real human body impedance. The problem of inaccurate human body impedance measurement results caused by nonstandard gestures during measurement of a user is solved, and the accuracy of the measurement results is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

Fig. 1 is a first flowchart of a method for measuring impedance of a human body according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a measurement of human body impedance according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a human body posture non-standard in a human body impedance measurement according to an embodiment of the present application.

Fig. 4 is another schematic diagram of a human body posture non-standard in the human body impedance measurement according to the embodiment of the present application.

Fig. 5 is a second flowchart of a method for measuring impedance of a human body according to an embodiment of the present application.

Fig. 6 is a third flowchart of a method for measuring impedance of a human body according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a wearable device according to an embodiment of the present application.

Fig. 8 is a first schematic diagram of functional modules in the wearable device shown in fig. 7.

Fig. 9 is a schematic diagram of measurement of a wearable device according to an embodiment of the present application.

Fig. 10 is a second schematic diagram of functional modules in the wearable device shown in fig. 7.

Fig. 11 is a third schematic diagram of functional modules in the wearable device shown in fig. 7.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments herein.

In the embodiment of the application, at least one refers to one or more; plural means two or more. In the description of the present application, the words "first," "second," "third," and the like are used solely for the purpose of distinguishing between descriptions and not necessarily for the purpose of indicating or implying a relative importance or order.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, the terms "comprising," "including," "having," and variations thereof herein mean "including but not limited to," unless expressly specified otherwise.

It should be noted that, in the embodiment of the present application, "and/or" describe the association relationship of the association object, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/", unless otherwise specified, generally indicates that the associated object is an "or" relationship.

It should be noted that in the embodiments of the present application, "connected" is understood to mean electrically connected, and two electrical components may be connected directly or indirectly between two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.

The embodiment of the application provides a human body impedance measurement method, which is applied to wearable equipment, wherein the wearable equipment can comprise equipment such as an intelligent watch, an intelligent bracelet, an intelligent arm ring, an intelligent foot ring, an intelligent ear nail, an intelligent ring, intelligent glasses and headphones, and the wearable equipment is taken as an intelligent watch for illustration. Referring to fig. 1, fig. 1 is a first flowchart of a method for measuring impedance of a human body according to an embodiment of the present application. The human body impedance measurement method specifically comprises the following steps:

101, acquiring initial body impedance by using a first electrode and a second electrode of the wearable device, wherein the first electrode and the second electrode are used for contacting different parts of a user.

The wearable device comprises a first electrode and a second electrode which are arranged at intervals, wherein the first electrode and the second electrode are used for contacting different parts of a user, and the first electrode and the second electrode can be used for measuring the human body impedance of the user so as to obtain initial human body impedance.

In some examples, please refer to fig. 2, fig. 2 is a schematic diagram of a measurement of human body impedance according to an embodiment of the present application. The first electrode (VSI, ISI) can contact the left hand of the user, the second electrode (VSO, ISO) contacts the right hand of the user, and if the user is in a standard gesture during measurement, namely the upper arm of the user is lifted relative to the trunk and the upper arm and the forearm are spread, the measurement paths of the first electrode and the second electrode are the complete arm spread of the user, and the measured result is the standard human body impedance. For example, if Z1 represents the impedance of the simplified upper left body of the user and Z2 represents the impedance of the simplified upper right body of the user, z1+z2 may represent the actual measured body impedance. The impedance of Z1+Z2 can be measured by inputting a sine wave current through the I terminal (ISO, ISI) and sampling through the V (VSO, VSI) terminal.

In some examples, the first electrode and the second electrode each comprise a set of electrode pairs, each set comprising two sub-electrodes, one of which is for transmitting a current signal to the hand and the other of which is for measuring a voltage signal generated by the current signal through the human body. And calculating the corresponding human body impedance according to the transmitted current signal and the measured voltage signal.

If the posture is not standard during the measurement of the user, as shown in fig. 3 and fig. 4, fig. 3 is a schematic diagram of the human posture is not standard during the measurement of the human impedance provided in the embodiment of the present application, and fig. 4 is another schematic diagram of the human posture is not standard during the measurement of the human impedance provided in the embodiment of the present application. I.e. the upper arm and forearm are not spread apart and/or the shoulder is not fully raised relative to the torso, the measuring path of the first and second electrodes is not the user's complete arm spread and is shorter than the complete arm spread. It can be understood that the measured impedance value and the length of the current path show a proportional relationship, that is, if the posture is not standard when the user measures, the measured initial human body impedance is smaller than the standard human body impedance, wherein the measurement path can be a path through which the current flows, that is, the measurement path is equivalent to the current path. As shown in fig. 3, D1 is a current path corresponding to a standard posture, D2 is a current path corresponding to an irregular posture in which the upper arm and the forearm are not spread, D2 is significantly smaller than D1, and as shown in fig. 4, D3 is a current path corresponding to a standard posture, D4 is a current path corresponding to an irregular posture in which the upper arm and the forearm are not spread, and D4 is significantly smaller than D3.

It will be appreciated that if the upper arm and forearm of the user are not spread apart, or the shoulder is not fully raised relative to the torso, the measurement path between the first electrode and the second electrode is shorter than the full arm, and the measured initial body resistance is less than the standard body resistance. If the upper arm and the forearm of the user are not spread, and the shoulder is not lifted completely relative to the trunk, the measuring path between the first electrode and the second electrode is shorter, and the measured initial human body resistance is farther from the standard human body impedance difference.

In some embodiments, the first electrode and the second electrode of the wearable device are utilized to contact different hands of the user to obtain an initial body impedance. The wearable device is characterized in that one part of electrodes such as a first electrode are arranged at the bottom of the wearable device and contact with the wrist of one hand of a user, the other part of electrodes such as a second electrode are arranged on a surface frame of the wearable device and can contact with the fingers of the other hand of the user, and when the two hands contact with the electrodes, the measurement of human body impedance can be performed. The path between the current from one hand of the user to the other hand is a current path for measuring the impedance of the human body by the wearable equipment, and the longer the current path is, the larger the value of the measurement sample can be provided, the subsequent effective evaluation of the health degree of the human body is facilitated, and the measurement fluctuation caused by small fluctuation is reduced.

102, acquiring the current human body posture.

The sensor is arranged in the wearable device, the sensor of the wearable device can be used for detecting and acquiring parameters, and the current human body posture is obtained by using the parameters.

In some examples, the wearable device may include a gravity sensor, which may acquire gravity information. The wearable device can rotate along with the hand of a user, the rotation angle, the rotation direction and the like of the wearable device and the hand wearing the wearable device can be obtained through gravity information acquired by the gravity sensor, and the current human body posture can be determined according to the rotation angle and the rotation direction.

103, adjusting the initial human body impedance according to the current human body posture to obtain a target human body impedance.

After the current human body posture is obtained, the initial human body impedance is adjusted according to the current human body posture, so that the adjusted target human body impedance is obtained. For example, the corresponding adjustment parameters are found according to the current human body posture table lookup, and then the target human body impedance is obtained according to the adjustment parameters and the initial human body impedance, so that the measurement result is more similar to the real human body impedance. The problem of inaccurate human body impedance measurement results caused by nonstandard gestures during measurement of a user is solved, and the accuracy of the measurement results is improved.

In some embodiments, the adjustment parameters may be obtained by the current human posture, and then the initial human impedance may be adjusted by the adjustment parameters to obtain the target human impedance. For example, a first comparison table of the human body posture and the adjustment parameters may be set in advance, and after the current human body posture is obtained, the corresponding adjustment parameters may be obtained by looking up a table based on the first comparison table. The first look-up table may be calculated from big data or calculated from AI algorithm based on a very large amount of user information.

In some examples, the first lookup table includes a human body pose and adjustment parameters that are mapped to the human body pose. The human body posture in the first comparison table may include a standard human body posture and an nonstandard human body posture, and the greater the difference between the nonstandard human body posture and the standard human body posture is, the greater the corresponding adjustment parameter is. Similarly, the smaller the difference between the nonstandard human body posture and the standard human body posture is, the smaller the corresponding adjustment parameters are.

The embodiment of the application also provides a method for measuring the impedance of the human body, referring to fig. 5, fig. 5 is a second flowchart of the method for measuring the impedance of the human body provided in the embodiment of the application. The body impedance measurement method may further include:

An initial body impedance is obtained 201 using a first electrode and a second electrode of a wearable device, wherein the first electrode and the second electrode are configured to contact different parts of a user.

The wearable device comprises a first electrode and a second electrode which are arranged at intervals, wherein the first electrode and the second electrode are used for contacting different parts of a user, and the first electrode and the second electrode can be used for measuring the human body impedance of the user so as to obtain initial human body impedance. The step of obtaining the initial body impedance may be specifically referred to the above embodiments, and will not be described herein.

202, acquiring pre-stored gravity reference information of the wearable device.

The gravity reference information is the gravity information of the wearable device in the standard posture when the user performs measurement in the standard posture. That is, the gravity reference information may be gravity information measured by a gravity sensor of the wearable device when the wearable device is in a horizontal state.

It will be appreciated that the gravity reference information may be a gravity sensor of the wearable device, the gravity information being tested when the user is in a standard posture for measurement. The gravity reference information may also be gravity information that the manufacturer stores in advance in the wearable device.

203, acquiring gravity measurement information by using a gravity sensor of the wearable device.

The sensor arranged in the wearable device can comprise a gravity sensor, and the gravity sensor can acquire the gravity information of the current wearable device in real time. The gravity measurement information is obtained by measuring a gravity sensor of the wearable equipment in real time.

204, determining the current human posture according to the gravity measurement information and the gravity reference information.

The wearable device can rotate along with the arm of a user, gravity information acquired through the gravity sensor and gravity reference information are used as reference standards, the rotation angle, the rotation direction and the like of the wearable device can be obtained, and the current human body posture can be determined according to the rotation angle and the rotation direction.

In some examples, a second comparison table of the gravity reference information, the gravity measurement information and the human body posture may be set in advance, and after the gravity measurement information and the gravity reference information are obtained, the corresponding current human body posture may be obtained by a table look-up method based on the second comparison table. The second look-up table may be calculated from big data or by an AI algorithm (e.g. neural network algorithm) based on a very large amount of user information.

In some embodiments, the gravity reference information corresponds to a standard human body posture, the gravity measurement information corresponds to a current human body posture, after the gravity measurement information and the gravity reference information are obtained, the values of the gravity measurement information and the gravity reference information can be compared in advance, if the values are consistent, the current human body posture is consistent with the standard human body posture, the initial human body impedance is not required to be adjusted, and if the values are inconsistent, the current human body posture is determined according to the gravity measurement information and the gravity reference information.

In some examples, the rotation angle of the current human body posture relative to the standard human body posture may be obtained from the offset of the gravity measurement information and the gravity reference information, thereby obtaining the current human body posture.

In some examples, the second lookup table includes an offset of the gravity measurement information and the gravity reference information, a human posture mapped to the offset. The larger the offset of the gravity measurement information and the gravity reference information is, the larger the difference between the current human body posture and the standard human body posture is, and similarly, the smaller the offset of the gravity measurement information and the gravity reference information is, the smaller the difference between the current human body posture and the standard human body posture is.

205, adjusting the initial human body impedance according to the current human body posture to obtain a target human body impedance.

After the current human body posture is obtained, the initial human body impedance is adjusted according to the current human body posture, so that the adjusted target human body impedance is obtained, and the measurement result is more similar to the real human body impedance. The problem of inaccurate human body impedance measurement results caused by nonstandard gestures during measurement of a user is solved, and the accuracy of the measurement results is improved.

In some embodiments, the initial body impedance may be adjusted based on the ratio of the gravity measurement information and the gravity reference information to obtain the target body impedance.

Specifically, under the condition of standard posture measurement, the whole arm of the user can be unfolded, the wearable device can keep a horizontal posture on the arm, the gravity sensor outputs gravity reference information W of the current device, and at the moment, the measured human body impedance data is the impedance data closest to a true value, and additional compensation is not needed.

Under other posture measurement conditions, such as that the hands are close to the chest, the joints of the arms are close to each other, and meanwhile, the wearable device cannot be horizontally kept on the wrist and has a certain inclination, so that gravity measurement information W ' measured by the gravity sensor is different from the gravity measurement information W ' in a horizontal state, and therefore, the compensation coefficient can be beta=w/W '. In the case of the current measured impedance, the measured initial body impedance is Zb ', which is the measured impedance in the shorter measurement path, partially different from the actual impedance, so that the actual upper body impedance of the body, i.e., the target body impedance zb=zb' ×β.

Referring to fig. 6, fig. 6 is a third flowchart of the human body impedance measurement method provided in the embodiment of the present application, where the human body impedance measurement method may further include:

301, an initial body impedance is obtained using a first electrode and a second electrode of a wearable device, wherein the first electrode and the second electrode are configured to contact different portions of a user.

302, acquiring pre-stored gravity reference information of the wearable device.

303, acquiring gravity measurement information by using a gravity sensor of the wearable device.

304, obtaining distance information between the wearable device and the torso of the user according to the distance sensor of the wearable device.

The sensors provided in the wearable device may further include a distance sensor that may acquire distance information between the wearable device and the torso of the user.

305, determining the current human posture according to the distance information, the gravity measurement information and the gravity reference information.

The wearable device can rotate along with the arm of a user, and the angle, the direction and the like of the rotation of the wearable device can be obtained by taking the gravity information acquired by the gravity sensor and the gravity reference information as reference standards. The current human body posture can be determined according to the rotation angle and direction and the distance information of the wearable device and the body.

In some embodiments, a third comparison table of the gravity reference information, the gravity measurement information, the distance information and the human body posture may be set in advance in the wearable device, and after the gravity measurement information, the gravity reference information and the distance information are obtained, the corresponding current human body posture may be obtained by a table look-up method based on the third comparison table. The third look-up table may be calculated from big data or by an AI algorithm (e.g. neural network algorithm) based on a very large amount of user information.

In some examples, the gravity reference information corresponds to a standard human body posture, the gravity measurement information corresponds to a current human body posture, the distance information corresponds to a distance between the wearable device and the trunk of the user, and the offset of the gravity measurement information and the gravity reference information, the mapping relationship between the distance information and the human body posture can be obtained in advance through big data calculation. For example, ten thousand sets of mapping relations of the offset, the distance information and the human body posture are counted, and then a third comparison table is formed according to the counted data.

In some embodiments, the distance sensor may measure distance information in one direction, such as perpendicular to the wearable device bottom direction. In combination with the gravity measurement information, the distance between the wearable device and the torso, such as the chest, of the user can be calculated.

In some examples, the wearable device may calculate a first human body posture of the user according to the offset of the gravity measurement information and the gravity reference information, and then correct the first human body posture according to the distance information to determine the current human body posture. The method for calculating the first human body posture of the user according to the offset of the gravity measurement information and the gravity reference information may refer to the above embodiment, and will not be described herein. In some examples, the relative pose between the user's forearm and upper arm, and the relative pose between the user's arm, such as upper arm, and torso, may be corrected based on the distance information. It can be appreciated that there is a distance reference information between the wearable device and the torso of the user that does not affect the impedance measurement, and when the distance information is smaller than the distance reference information, the larger the difference between the distance information and the distance reference information, the larger the correction amplitude of the first human body posture. Wherein the distance information may have a greater correction weight for the relative pose between the forearm and upper arm of the user than for the relative pose between the arm and torso. In other examples, only the relative pose between the user's forearm and upper arm may be corrected based on distance information.

In some embodiments, the distance sensor may measure distance information in multiple directions. For example, the distance sensor can measure the distance towards the chest of the user and the distance towards the upper arm of the user, and then calculate the distance information between the wearable device and the chest of the user and the distance information between the wearable device and the upper arm of the user through the gravity measurement information, and meanwhile, the current human body posture of the user can be calculated by combining the gravity reference information and the gravity measurement information, namely combining the rotation angle and/or the rotation direction of the wearable device.

In some examples, the wearable device may calculate a first human body posture of the user according to the offset of the gravity measurement information and the gravity reference information, and then correct the first human body posture according to the distance information to determine the current human body posture. The method for calculating the first human body posture of the user according to the offset of the gravity measurement information and the gravity reference information may refer to the above embodiment, and will not be described herein. In some examples, the wearable device may obtain distance information between the wearable device and the torso, upper arm, etc. through a plurality of distance sensors, and the wearable device may correct a relative posture between the forearm and the upper arm of the user and a relative posture between the upper arm and the torso of the user according to the distance information. It can be appreciated that there is a distance reference information between the wearable device and the torso of the user that does not affect the impedance measurement, and when the distance information is smaller than the distance reference information, the larger the difference between the distance information and the distance reference information, the larger the correction amplitude of the first human body posture.

In some examples, the wearable device may obtain distance information between the wearable device and the torso, upper arm, etc. through a plurality of distance sensors, and the wearable device may determine the current human posture from the offset of the gravity measurement information and the gravity reference information, and the distance information. In some examples, the distance between the forearm and the upper arm, the distance between the forearm and the torso may be obtained from the distance information to obtain a relative pose between the forearm and the upper arm, and then the relative pose between the upper arm and the torso may be obtained in combination with the offset of the gravity measurement information and the gravity reference information to obtain the current body pose. For example, the distance between the forearm and the trunk, the distance between the forearm and the upper arm, and the relative posture between the forearm and the trunk can be determined by the distance information, and then the relative posture between the upper arm and the trunk is obtained by combining the gravity measurement information and the offset of the gravity reference information, and finally the current human posture is obtained. In other examples, the wearable device may also correct the relative posture between the forearm and the upper arm based on the offset of the gravity measurement information and the gravity reference information before the current posture of the human body is obtained.

306, adjusting the initial human body impedance according to the current human body posture to obtain a target human body impedance.

After the current human body posture is obtained, the initial human body impedance is adjusted according to the current human body posture, so that the adjusted target human body impedance is obtained, the measurement result is more similar to the real human body impedance, the problem that the measurement result of the human body impedance is inaccurate due to the fact that the posture is not standard when a user measures is solved, the more accurate human body impedance is obtained, and the accuracy of the measurement result is improved.

In some embodiments, adjusting the initial body impedance to obtain the target body impedance according to the current body posture may include:

acquiring an initial current path between a pre-stored first electrode and a pre-stored second electrode;

and adjusting the initial human body impedance according to the ratio of the initial current path to the current path so as to obtain the target human body impedance.

Specifically, if the human body is regarded as an impedance model, the measured impedance value and the length of the current path show a proportional relationship, so that under the condition of normal posture measurement, the arm is fully unfolded, the measurement path is the whole arm span L of the human body, and the measured impedance is the required real impedance, namely the target human body impedance Zb. When the measured pose is not sufficiently normative, the measurement path L 'is smaller than the normal arm span, in which case the measured impedance, i.e. the initial body impedance, is Zb'. The actual impedance required should therefore be zb=zb '(L/L').

Normally, the ratio of the normal arm span to the height of the human body is 1:1, so that the arm span L of the human body can be calculated under the condition that the wearable device has the height information of the human body. The wearable equipment can acquire the height of a human body through modes such as user input, bluetooth transmission, wifi transmission and the like. Of course, the wearable device may also directly acquire the arm span L, such as user input or other device wireless transmission arm span L.

The distance sensor installed on the wearable device may measure the distance L2 between the current wearable device and the torso, such as the chest, and the compensation coefficient β (β may be obtained by using the gravity sensor and the foregoing embodiment and will not be described herein in detail) may be known, and the deflection degree of the arm in the current posture may be obtained by combining the distance information and the compensation coefficient, and the current measurement path L' =l2×βk+b, where k is a converted scaling coefficient, and b is a compensation coefficient, where the scaling coefficient k and the compensation coefficient b may be obtained by a large amount of data calculation, such as calculation by a big data calculation or an AI algorithm (such as a neural network algorithm).

Therefore, the true impedance, i.e., the target human body impedance, can be obtained:

Zb＝Zb’(L/(L2*β*k+b))；

wherein Zb 'is the impedance in the current measurement state, L is the arm span, L2 is the distance from the wearable device to the trunk of the user output by the distance sensor, beta is W/W', namely the ratio of the horizontal gravity to the current gravity, k is the proportional coefficient of conversion, and b is the compensation coefficient.

It should be noted that, the above embodiment only exemplifies an algorithm for calculating the target human body impedance based on the initial human body impedance, the distance information, the gravity measurement information and the gravity reference information, and other algorithms may be used in the present application to calculate the target human body impedance.

In some embodiments, the body impedance measurement method may further include:

the initial body impedance is adjusted according to the first relative pose and the second relative pose to obtain a target body impedance.

The initial body impedance is adjusted by the first relative pose of the arms and torso, and the second relative pose of the forearm and upper arm, resulting in a target body impedance. In some examples, the first relative pose and the second relative pose may also be derived from gravity measurement information measured by a gravity sensor in combination with distance information measured by a distance sensor. In some examples, the first relative pose may be derived from gravity measurement information measured by a gravity sensor and the second relative pose may be derived from distance information measured by a distance sensor.

In some examples, the wearable device may obtain distance information between the wearable device and the torso, the upper arm, etc. through a plurality of distance sensors, and the distance between the forearm and the upper arm, the distance between the forearm and the torso may be obtained through the distance information, so as to obtain a second relative posture between the forearm and the upper arm, then obtain a second relative posture between the upper arm and the torso by combining the gravity measurement information and the offset of the gravity reference information, and then adjust the initial human body impedance according to the first relative posture and the second posture. For example, the larger the difference between the first relative posture and the standard posture, the larger the corresponding adjustment range, and similarly, the larger the difference between the second relative posture and the standard posture, the larger the corresponding adjustment range. For example, by means of the distance information, the distance between the forearm and the torso, the distance between the forearm and the upper arm, at which the wearable device is worn, may be determined, resulting in a second relative pose between the forearm and the upper arm, and a relative pose of the forearm and the torso, and then combining the gravity measurement information and the offset of the gravity reference information, resulting in a first relative pose between the upper arm and the torso. In other examples, the wearable device may also correct the second relative pose between the forearm and the upper arm based on the offset of the gravity measurement information and the gravity reference information before the current human pose is obtained.

It is understood that after the first relative posture and the second relative posture are obtained, the current human body posture may be obtained through the first relative posture and the second relative posture, and then the initial human body impedance may be adjusted according to the current human body posture, so as to obtain the target human body impedance.

It can be appreciated that in any of the above embodiments, after the target human body impedance is obtained, the target human body impedance may be combined with at least one of the height, age, weight, etc. of the human body to calculate the related data of the human body components, such as parameters of body fat rate or body moisture, etc., so as to effectively evaluate the health degree of the human body.

The embodiment of the application further provides a wearable device, please refer to fig. 7 and fig. 8, fig. 7 is a schematic structural diagram of the wearable device provided in the embodiment of the application, and fig. 8 is a first schematic diagram of functional modules in the wearable device shown in fig. 7. The wearable device 400 includes a first electrode 410, a second electrode 420, and a processor 430, where the first electrode 410 and the second electrode 420 are used to obtain an initial human body impedance, the first electrode 410 and the second electrode 420 are used to contact different parts of a user, the processor 430 is connected to the first electrode 410 and the second electrode 420, and the processor 430 is used to obtain a current human body posture, and adjust the initial human body impedance according to the current human body posture to obtain a target human body impedance.

In some examples, please refer to fig. 9, fig. 9 is a schematic diagram of a measurement of a wearable device provided in an embodiment of the present application, where a first electrode may contact one hand of a user, such as a left hand, and a second electrode may contact the other hand of the user, such as a right hand, and the first electrode and the second electrode respectively include a set of electrode pairs, each set of electrode pairs includes two sub-electrodes, where one sub-electrode is used to transmit a current signal to the hand, and the other sub-electrode is used to receive a voltage signal generated by the current signal passing through a human body. And calculating the corresponding human body impedance according to the transmitted current signal and the acquired voltage signal.

And adjusting the initial human body impedance according to the current human body posture, thereby obtaining the adjusted target human body impedance. For example, the corresponding adjustment parameters are found according to the current human body posture lookup table, and then the target human body impedance is obtained according to the adjustment parameters and the initial human body impedance. The problem of inaccurate measurement caused by nonstandard posture of a user during measurement can be solved, more accurate human body impedance is obtained, and accuracy of a measurement result is improved.

In some embodiments, please refer to fig. 10, fig. 10 is a second schematic diagram of functional modules in the wearable device shown in fig. 7. The wearable device 400 may further comprise a gravity sensor 440, the gravity sensor 440 may obtain gravity measurement information of the current wearable device 400, the gravity sensor 440 being connected to the processor 430. The processor 430 is further configured to acquire preset gravity reference information, and determine a current posture of the human body according to the gravity measurement information and the gravity reference information.

Under the condition of standard posture measurement, the whole arm of a user can be unfolded, the wearable device can keep a horizontal posture on the arm, the gravity sensor outputs gravity reference information W of the current device, and the measured human body impedance data is the impedance data closest to a true value at the moment, so that additional compensation is not needed.

In some embodiments, please refer to fig. 11, fig. 11 is a third schematic diagram of functional modules in the wearable device shown in fig. 7. The wearable device 400 may further include a distance sensor 450, the distance sensor 450 may obtain distance information between the wearable device 400 and the torso of the user, the distance sensor 450 being connected to the processor 430. The processor 430 is also used to determine the current human posture based on the distance information, the gravity measurement information, and the gravity reference information. A more accurate current human posture may be determined through the distance information, the gravity measurement information, and the gravity reference information in order to obtain a more accurate target human impedance.

In some embodiments, the processor may also obtain a pre-stored initial current path between the first electrode and the second electrode; obtaining a current path according to the distance information, the gravity measurement information and the gravity reference information; and adjusting the initial human body impedance according to the ratio of the initial current path to the current path so as to obtain the target human body impedance.

Specifically, if the human body is regarded as an impedance model, the measured impedance value and the length of the current path show a proportional relationship, so that under the condition of normal posture measurement, the arm is fully unfolded, the measurement path is the whole arm span L of the human body, and the measured impedance is the required real impedance, namely the target human body impedance Zb. When the measured pose is not sufficiently normative, the measurement path L 'is smaller than the normal arm span L, in which case the measured impedance, i.e. the initial body impedance, is Zb'. The actual impedance required should therefore be zb=zb '(L/L').

Zb＝Zb’(L/(L2*β*k+b))；

It will be appreciated that in any of the above embodiments, after the processor obtains the target human body impedance, the processor may calculate the related data of the human body components, such as parameters of body fat rate or body moisture, by combining the target human body impedance with at least one of height, age, weight, etc., so as to effectively evaluate the health degree of the human body.

The wearable device may include devices such as smart watches, smart bracelets, smart armrings, smart footrings, smart earstuds, smart rings, smart glasses, and headphones.

It should be noted that, the wearable device provided in the embodiment of the present application and the method for measuring human body impedance in the above embodiment belong to the same concept, and any method provided in the embodiment of the method for measuring human body impedance may be run on the wearable device, and detailed implementation processes of the method are shown in the embodiment of the method for measuring human body impedance, which is not repeated herein. For example, a processor in the wearable device may perform steps in the body impedance measurement method, and a wearable device gravity sensor, a distance sensor may implement functions in the body impedance measurement method. The embodiments, implementation manners and related technical features of the present application can be combined and replaced without conflict.

The present application also provides a storage medium storing a computer program which, when run on a computer, causes the computer to perform the method of any of the above embodiments, such as: acquiring initial human body impedance by using a first electrode and a second electrode of the wearable device, wherein the first electrode and the second electrode are used for contacting different parts of a user; acquiring the current human body posture; the initial human body impedance is adjusted according to the current human body posture to obtain the target human body impedance.

In the embodiment of the present application, the storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.

It should be noted that, for the body impedance measurement method according to the embodiment of the present application, it will be understood by those skilled in the art that all or part of the flow of implementing the body impedance measurement method according to the embodiment of the present application may be implemented by controlling related hardware through a computer program, where the computer program may be stored in a computer readable storage medium, such as a memory of an electronic device, and executed by at least one processor within the electronic device, and the execution may include the flow of the embodiment of the processing method, such as a tablet. The storage medium may be a magnetic disk, an optical disk, a read-only memory, a random access memory, etc.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The foregoing description is not intended to limit the preferred embodiments of the present application, but is not intended to limit the scope of the present application, and any such modifications, equivalents and adaptations of the embodiments described above in accordance with the principles of the present application should and are intended to be within the scope of the present application, as long as they do not depart from the scope of the present application.

Claims

1. A method of measuring body impedance for use with a wearable device, the method comprising:

acquiring the current human body posture;

2. The method of claim 1, wherein the obtaining the current human posture comprises:

acquiring pre-stored gravity reference information of the wearable equipment;

3. The method of claim 2, wherein adjusting the initial body impedance based on the current body posture to obtain a target body impedance comprises:

4. The method of claim 2, wherein the obtaining the current human posture comprises:

acquiring distance information between the wearable device and the trunk of a user according to a distance sensor of the wearable device;

5. The method of claim 4, wherein adjusting the initial body impedance based on the current body position to obtain a target body impedance comprises:

6. The method of any one of claims 1-5, wherein the obtaining an initial body impedance with the first electrode and the second electrode of the wearable device comprises:

7. The method of claim 6, wherein the obtaining the current body posture comprises:

8. A wearable device, comprising:

9. The wearable device of claim 8, wherein the wearable device comprises:

10. The wearable device of claim 9, wherein the wearable device comprises: