TWI781375B - The method of standing bioimpedance detection of grip strength - Google Patents

Abstract

A method for measuring grip strength by standing bio-impedance, which mainly uses a bio-impedance measuring device to obtain the sex, weight, age and height of a subject, and the subject is in a standing posture and touches the first The electrode group and the second electrode group, the bio-impedance measuring device inputs a measurement current to one of the first electrode group or the second electrode group, and the other one of the first electrode group or the second electrode group receives the measurement The electric current is used to calculate the resistance value and reactance value of the tested part of the subject, and then the grip strength of the subject is calculated by a calculation formula, so as to evaluate the quality of the muscle and serve as an indicator of human health.

Description

A method of measuring grip strength by standing bioimpedance

The invention is related to bio-impedance detection technology, in particular to a method for standing-type bio-impedance detection of grip strength.

A study surveyed nearly 140,000 patients in more than ten countries and found that for every 5 kg decrease in the handgrip strength (HGS) of the human body, the patient's death rate increased by 16%, and the possibility of heart attack increased by 7%. The risk of stroke increases by 9%; HGS can be used to assess the health and development status of children and adolescents, and the average test results in different groups of subjects can also be used as an important reference for patients after hand surgery. Another study indicated that HGS showed parameters of nutritional deprivation and nutritional repletion earlier than other body parameters, and the ratio of HGS to protein loss was related to the ratio of muscle function. When a patient was diagnosed with malnutrition In some cases, HGS is one of the main reference data, and when nutritional therapy is performed on malnourished patients, the prognosis can be improved by improving the parameters of HGS. Other studies have pointed out that the HGS of inpatients at admission can predict the length of hospitalization and the survival rate of inpatients. When the HGS is larger, the hospitalization time is shorter and the survival rate is higher.

From the above, it can be seen that since HGS can provide information about overall muscle strength, it can be used for clinical reference, such as: reflecting the impact of aging on the physical function of the elderly, as well as the strength and function of the whole body muscles. Therefore, HGS parameters can provide information for evaluating human muscle strength. The quality of food can be used as an indicator of human health.

At present, HGS technologies commonly used to measure the human body mainly include hand-held dynamometer (dynamometer), bioelectrical impedance analysis (bioelectrical impedance analysis, BIA), etc.

With regard to the hand-held dynamometer, the subject can directly press the dynamometer with the grip force to obtain the grip force parameters, which has the advantages of low cost, easy to carry, and simple operation; however, the test results are easily affected by the test instrument and the test environment. , The subject's physical condition, posture, psychology and many other factors, the measured grip strength parameters are prone to errors.

Regarding the existing BIA technology, the subject is lying on his back, and then a safe AC current is input to the subject through the electrodes pasted on the skin surface, as shown in Figure 1, and the corresponding resistance (Resistance) is measured through the AC current. , R) and reactance (Reactance, Xc), and then further calculate the phase angle (Phase angle, PhA) (φ shown in Figure 1) according to the measurement results; because BIA technology is safe, non-invasive, convenient and Low cost and other advantages have been used to estimate body composition in medical treatment and research; however, in terms of research and practical application of BIA in estimating grip strength, there are currently only two related studies on supine BIA for estimating grip strength ( 1. Norman, K.; Pirlich, M.; Sorensen, J.; Christensen, P.; Kemps, M.; Schütz, T.; Lochs, H.; Kondrup, J. Bioimpedance vector analysis as a measure of muscle function . Clin. Nutr. 2009, 28: 78-82.; 2. Rodríguez-Rodríguez, F.; Cristi-Montero, C.; González-Ruíz, K.; Correa-Bautista, J.E.; Impedance Vector Analysis and Muscular Fitness in Healthy Men. Nutrients. 2016, 8(7): 407.); Among them, the supine BIA measurement requires a test bed that can lie flat and has an insulating surface, as well as an operator It assists the sticking and operation of the electrodes, and can only measure the resistance and reactance of the right half of the whole body. It cannot be used more accurately for the grip strength assessment of the upper limbs, and it is still inconvenient in actual use.

The main purpose of the present invention is to provide a method of standing bio-impedance detection of grip strength, which is to perform BIA measurement with the subject in a standing posture, which directly analyzes the bioelectric properties of human tissue, and the calculated HGS parameters , which can provide an assessment of the quality of human muscle as an indicator of human health.

In order to achieve the above-mentioned purpose, the present invention provides a method for measuring grip strength by standing bioimpedance, comprising the following steps: (a) obtaining a subject's sex, weight, age and height with a bioimpedance measuring device; The bio-impedance measurement device has at least one first electrode set and at least one second electrode set. The subject is in a standing posture and touches the at least one first electrode set and the at least one second electrode with at least two of his limbs respectively. set; the bio-impedance measurement device inputs a measurement current to one of the at least one first electrode set or the at least one second electrode set, and the at least one first electrode set or the at least one second electrode set The other one receives the measurement current to calculate the resistance value and reactance value of the tested part of the subject; and the grip strength of the subject is calculated by the following calculation formula: HGS=a+bSex+cWeight+ dAge+eHt+fXc _i /Ht+g R/Ht, where a, b, c, d, e, f and g are weight coefficients, and the weight coefficients are based on the height, weight, age, gender, and weight of a group of subjects. The resistance and reactance of the limbs and the corresponding grip strength measurement, the collected grip strength is the dependent variable, the height, weight, age, gender, the resistance and reactance of different limbs are the independent variables, and the regression analysis is used to obtain different measurement modes The grip strength will generate weight coefficients in each measurement mode, so as to obtain specific calculation formulas in each measurement mode. In the formula, Sex is the sex of the subject, the coefficient is 0 if the sex is female, and the coefficient is 1 if the sex is male; Weight is the weight of the subject; Age is the age of the subject; Ht is the The height of the subject; Xc is the reactance of the subject; R is the measured resistance of the subject.

Thereby, the present invention provides a method for detecting grip strength by standing bioimpedance, which is to perform BIA measurement with the subject in a standing posture, which is to directly analyze the bioelectric properties of human tissue, and the calculated HGS parameters, It can be used to evaluate the quality of human muscle as an indicator of human health.

The first preferred embodiment of the method 10 of the standing bioimpedance test grip strength of the present invention is shown in Figure 2-9, which includes the following steps:

(a) Obtain the gender, weight, age and height of a subject with a bio-impedance measuring device 20; in this preferred embodiment, the sex, age and height of the subject are input by the subject provided, and the body weight of the subject is measured by the bio-impedance measuring device 20, but it is not limited thereto in other preferred embodiments.

(b) The bio-impedance measurement device 20 has a first electrode set 21 and a second electrode set 23. The subject is in a standing posture and touches the first electrode set 21 and the second electrode set 21 with at least two of his limbs respectively. Two electrode groups 23 .

(c) The bio-impedance measurement device 20 inputs a measurement current to one of the first electrode set 21 or the second electrode set 23, and the other electrode set 21 or the second electrode set 23 One accepts the measurement current to calculate the resistance value and reactance value of the measured part of the subject; wherein the frequency of the measurement current is 50KHz, but not limited thereto, the frequency of the measurement current is between 5KHz -200KHz can be used as implementation.

(d) The subject's grip strength is calculated by the following formula: DHGS=a+bSex+cWeight+dAge+eHt+fXc/Ht+g R/Ht, where DHGS (dominant handgrip strength, HGS) is the Grip strength; a, b, c, d, e, f and g are weight coefficients, and the weight coefficients are based on the measurement of height, weight, age, gender, resistance, reactance and corresponding grip strength of a group of subjects. The collected grip strength is the dependent variable, height, weight, age, gender, resistance and reactance of different limbs are independent variables, and regression analysis is used to obtain the grip strength estimation formula and corresponding weight coefficient of different measurement modes; among them, Sex is the sex of the subject (the coefficient is 0 if the sex is female, and 1 if the sex is male); Weight is the weight of the subject; Age is the age of the subject; Ht is the subject Xc is the reactance of the subject; R is the measured resistance of the subject. According to different measurement modes in the present invention, weight coefficients in each measurement mode will be generated.

In terms of hand-to-hand measurement, as shown in FIGS. 3 and 4 , the subject holds the first and second electrode sets 21 and 23 with both hands in a standing posture, and the bioimpedance measurement device 20 The measurement current is input to the first electrode group 21, and the measurement current is received by the second electrode group 23 to calculate the resistance value and reactance value of the hands of the subject, and use the test subject's Grip strength calculation formula calculates the subject's grip strength. Of course, the bio-impedance measurement device 20 can also input the measurement current to the second electrode group 23, and the first electrode group 21 receives the measurement current, and can also calculate the resistance value and the resistance value of the hands of the subject. The reactance value can also be calculated to obtain the grip strength of the subject.

In terms of foot-to-foot measurement, as shown in Figures 3 and 5, the subject is in a standing posture and touches the first and second electrode groups 21, 23 with the soles of both feet, and the bioimpedance measurement The device 20 inputs the measurement current to the first electrode set 21, and receives the measurement current from the second electrode set 23 to calculate the resistance value and reactance value of the feet of the subject, and use the measured current The grip strength calculation formula of the subject is used to calculate the grip strength of the subject.

For the hand-to-foot measurement method, as shown in Figures 3, 6 and 7, the subject is in a standing posture and uses the subject's right hand and right foot (Figure 6) or left hand and left foot (Figure 6). 7) Contacting the first electrode group 21 and the second electrode group 23 respectively, inputting the measurement current to the first electrode group 21 from the bio-impedance measuring device 20, and receiving the measurement current by the second electrode group 23 current to calculate the resistance and reactance values of the subject's right hand and right foot, or the subject's left hand and left foot, and calculate the subject's grip strength using the subject's grip strength calculation formula. As shown in Figures 3, 8 and 9, the subject is in a standing posture and touches the first electrode set 21 and the first electrode set 21 with the subject's right hand and left foot (Fig. For the second electrode group 23, the measurement current is input to the first electrode group 21 by the bio-impedance measurement device 20, and the measurement current is received by the second electrode group 23 to calculate the right hand and The resistance value and reactance value of the left foot, or the testee's left hand and right foot, and the testee's grip strength calculation formula is used to calculate the testee's grip strength.

Thereby, the present invention provides a method for detecting grip strength by standing bioimpedance, which is to perform BIA measurement with the subject in a standing posture, which is to directly analyze the bioelectric properties of human tissue, and the calculated HGS parameters, It can be used to evaluate the quality of human muscle as an indicator of human health.

The main steps and achieved effects of the second preferred embodiment of the method 10 of standing bioimpedance detection of grip strength of the present invention are generally the same as those of the first preferred embodiment, except that:

As shown in Figures 3, 10 and 11, the bio-impedance measuring device has two first electrode groups 21 and a second electrode group 23. Feet touch one of the first electrode sets 21 respectively, the left hand of the subject contacts the second electrode set 23 (Fig. 10) or the left hand and left foot touch the first electrode set 21 respectively, and the subject's right hand The second electrode group 23 (FIG. 11); the measurement current is input to the first electrode group 21 by the bio-impedance measuring device 20, and the measurement current is received by the second electrode group 23 to calculate the measured current. The resistance value and reactance value of the right or left hand of the testee, and the grip strength of the testee is calculated according to the grip strength calculation formula of the testee.

As shown in Figures 3, 12 and 13, the bio-impedance measurement device has two first electrode sets 21 and one second electrode set 23, and the subject's right hand and right foot are respectively in contact with one of the first electrode sets 21. The left foot of the subject is in contact with the second electrode set 23 (Fig. 12), or the left hand and foot of the subject are in contact with the first electrode set 21 respectively, and the right foot of the subject is in contact with the first electrode set 21. The second electrode group (Figure 13); the measurement current is input to the first electrode group 21 by the bio-impedance measuring device 20, and the measurement current is received by the second electrode group 23 to calculate the subject's The resistance value and reactance value of the right or left foot, and the grip strength of the subject is calculated according to the grip strength calculation formula of the subject.

The main steps and achieved effects of the third preferred embodiment of the method of standing bio-impedance detection of grip strength of the present invention are generally the same as those of the first preferred embodiment, except that:

As shown in Figures 3 and 14, the bio-impedance measurement device has two first electrode groups 21 and two second electrode groups 23, and the subject's right hand and right foot are respectively in contact with one of the first electrode groups 21, The subject's left hand and left foot are respectively in contact with a second electrode group 23; the measurement current is input to a first electrode group 21 by the bio-impedance measuring device 20, and is received by a second electrode group 23. The measured current is used to calculate the resistance value and reactance value of the subject's torso, and the subject's grip strength is calculated using the subject's grip strength calculation formula.

The main steps and achieved effects of the fourth preferred embodiment of the method of standing bio-impedance detection of grip strength of the present invention are generally the same as those of the first preferred embodiment, except that:

Please refer to FIGS. 3 and 15, the bio-impedance measuring device has two first electrode sets 21 and two second electrode sets 23, and the subject's hands touch one of the first electrode sets 21 respectively, The feet of the subject are in contact with the second electrode set 23 respectively; the measurement current is input to the first electrode set 21 by the bio-impedance measurement device 20, and the measurement current is received by the second electrode set 23 , to calculate the resistance value and reactance value of the subject's whole body, and calculate the subject's grip strength with the subject's grip strength calculation formula.

To sum up, the present invention provides a method for measuring grip strength by standing bioimpedance. The BIA measurement site is not limited to the hands of the subject, but the BIA measurement results of multiple limbs or different limbs. , can be further calculated to obtain HGS parameters to provide an assessment of the quality of human muscle as an indicator of human health.

10: Standing bioimpedance test method for grip strength 20: Bio-impedance measurement device `` `` 21: The first electrode group `` `` 23: The second electrode group

Figure 1 is a Cole-Cloe Plot of resistance and reactance. Figure 2 is a flow chart of the method of the present invention. Figure 3 is a block diagram of the method of the present invention. Fig. 4 is a schematic diagram of the first preferred embodiment of the present invention, showing the measurement of both hands of the subject. Fig. 5 is a schematic diagram of the first preferred embodiment of the present invention, showing the measurement of both feet of the subject. Fig. 6 is a schematic diagram of the first preferred embodiment of the present invention, showing the measurement of the right hand and right foot of the subject. Fig. 7 is a schematic diagram of the first preferred embodiment of the present invention, showing the measurement of the left hand and left foot of the subject. Fig. 8 is a schematic diagram of the first preferred embodiment of the present invention, showing the measurement of the right hand and left foot of the subject. Fig. 9 is a schematic diagram of the first preferred embodiment of the present invention, showing the measurement of the left hand and right foot of the subject. Fig. 10 is a schematic diagram of the second preferred embodiment of the present invention, showing the measurement of the subject's right hand. Fig. 11 is a schematic diagram of the second preferred embodiment of the present invention, showing the measurement of the subject's left hand. Fig. 12 is a schematic diagram of the second preferred embodiment of the present invention, showing the measurement of the subject's right foot. Fig. 13 is a schematic diagram of the second preferred embodiment of the present invention, showing the left foot of the subject being measured. Fig. 14 is a schematic diagram of the third preferred embodiment of the present invention, showing the measurement of the torso of the subject. Fig. 15 is a schematic diagram of the fourth preferred embodiment of the present invention, showing the measurement of the whole body of the subject.

10: Standing bioimpedance test method for grip strength

Claims (9)

A method for standing bio-impedance detection of grip strength, comprising the following steps: (a) Obtain a subject's sex, weight, age and height with a bioimpedance measuring device; (b) The bio-impedance measurement device has at least one first electrode set and at least one second electrode set. The subject is in a standing posture and touches the at least one first electrode set and the at least one electrode set with at least two of his limbs respectively. a second electrode set; (c) The bio-impedance measurement device inputs a measurement current to one of the at least one first electrode set or the at least one second electrode set, and the at least one first electrode set or the at least one second electrode set The other one of the set receives the measured current to calculate the resistance value and reactance value of the tested part of the subject; and (d) The subject's grip strength is calculated by the following formula: HGS=a+bSex+cWeight+dAge+eHt+fXc/Ht+g R/Ht, where a, b, c, d, e, f and g is the weight coefficient; Sex is the sex of the subject, the coefficient is 0 if the sex is female, and the coefficient is 1 if the sex is male; Weight is the weight of the subject; Age is the age of the subject; Ht is the height of the subject; Xc is the reactance of the subject; R is the measured resistance of the subject. According to the method for detecting grip strength by standing bioimpedance according to item 1 of the scope of the patent application, wherein: in the step (b), both hands of the subject are in contact with the first and second electrode sets respectively. According to the method for detecting grip strength by standing bioimpedance according to item 1 of the scope of the patent application, wherein: in step (b), both feet of the subject contact the first and second electrode sets respectively. According to the method for detecting grip strength by standing bioimpedance according to item 1 of the scope of patent application, wherein: one of the hands of the subject in step (b) touches the first electrode set, and one of the feet touches the second electrode set. electrode set. According to the method of standing bio-impedance detection of grip strength according to item 1 of the scope of patent application, wherein: the bio-impedance measurement device has two of the first electrode set and a second electrode set, and one of the hands of the subject is One of the feet is in contact with the first electrode set, and the other hand of the subject is in contact with the second electrode set. According to the method of standing bio-impedance detection of grip strength according to item 1 of the scope of patent application, wherein: the bio-impedance measurement device has two of the first electrode set and a second electrode set, and one of the hands of the subject is One of the feet is respectively in contact with the first electrode set, and only the other foot of the subject is in contact with the second electrode set. According to the method of standing bio-impedance detection of grip strength according to item 1 of the scope of patent application, wherein: the bio-impedance measurement device has two of the first electrode set and two of the second electrode sets, and one of the hands of the subject is and one of the feet is respectively in contact with the first electrode group, and the other hand and the other foot of the subject are respectively in contact with the second electrode group. According to the method of standing bio-impedance detection of grip strength according to item 1 of the scope of patent application, wherein: the bio-impedance measurement device has two of the first electrode set and two of the second electrode sets, and the hands of the subject are respectively in contact with One of the first electrode sets, the two feet of the subject are respectively in contact with one of the second electrode sets. According to the method for measuring grip strength by standing bioimpedance according to item 1 of the scope of the patent application, wherein: the frequency of the measuring current is between 5KHz-200KHz.

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