JP2018183635A - Bioelectric signal acquisition system and bioelectric signal acquisition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bioelectric signal acquisition system using wearable electrodes capable of precisely detecting the R wave etc. of electro-cardiographic waveform over a long term.SOLUTION: A bioelectric signal acquisition system acquires bioelectric signals from electrodes which are installed at predetermined positions of a garment and detect the bioelectric signals of a living body when contacting with the living body wearing the garment. The system comprises an acceleration sensor which detects variation in the posture of the living body; an acquisition part which acquires the bioelectric signals by using a first electrode and plural second electrodes different from the first electrode; and a switch which selects one of the bioelectric signals acquired by using the first electrode and the second electrodes, when the acceleration sensor detects the variation in the posture of the living body.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a bioelectrode used for acquiring heartbeat and electrocardiogram waveforms on a daily basis, and a bioelectric signal acquisition system and method using the bioelectrode.

  In recent years, the importance of daily self-care has been pointed out. As one of such personal health management techniques, it has been proposed to record an electrocardiographic waveform over a long period of time. It is known that by analyzing the obtained waveform, disorder of autonomic nerves and signs of heart disease can be detected at an early stage, which is effective in preventive medicine.

  In particular, the fluctuation of the R wave emission time interval (RR interval) derived from the ventricular contraction movement reflects the function of the autonomic nerve, which is useful for grasping the stress state. Therefore, an electrocardiographic waveform recording apparatus is required to accurately measure the R wave.

  As an electrode configuration for acquiring an electrocardiographic waveform over a long period of time, attention has been focused on clothes (wearable electrodes) to which biological electrodes are attached (for example, see Non-Patent Document 1). In Non-Patent Document 1, an electrocardiographic waveform is measured by wearing a garment in which electrodes are embedded at a position where a measurement subject comes into contact with the left and right sides of the chest.

David M. D. Ribeiro, et. Al., "A Real time, Wearable ECG and Continous Blood Pressure Monitoring System for First Responders," 33rd Annual International Conference of the IEEE EMBS, pp. 6894-6898, 2011.

  However, in the conventional wearable electrode, as shown in FIG. 14, the bioelectrodes 51 and 52 are placed on the left and right sides of the chest at the height of the heart 20 in the garment 10 (near the center line of the left ventricle, near the nipple under the man). It is often installed and does not necessarily follow the cardiac electrical axis (QRS axis) 30 when an R wave is emitted from a healthy person. Therefore, an R wave PTP (Peak to Peak) is recorded in the recorded electrocardiographic waveform.・ Peak) There was a problem that the height was low and the detection accuracy deteriorated.

  In addition, when an axial deviation occurs in the cardiac electrical axis of the person being measured, the installation position of the electrode must be changed according to the cardiac electrical axis of each person being measured, and a general-purpose wearable electrode There was also a problem that it was difficult to provide.

  Furthermore, when electrodes are installed at two positions on the left and right sides of the chest as shown in FIG. 14, there may be a difference between the electrodes and the human body when the posture of the human body changes. Therefore, there is a problem that the stress on the human body is large in order to measure an electrocardiographic waveform on a daily basis.

  The present invention has been made to solve the above problems, and bioelectricity using a wearable electrode capable of accurately detecting a bioelectric signal such as an R wave of an electrocardiographic waveform over a long period of time. An object is to provide a signal acquisition system.

  In order to achieve the above object, a bioelectric signal acquisition system according to the present invention includes an electrode that is installed at a predetermined position on clothes and detects a bioelectric signal of the living body when it comes into contact with a living body wearing the clothes. A bioelectric signal acquisition system that acquires a bioelectric signal, using an acceleration sensor that detects a change in posture of the living body, and a plurality of second electrodes different from the first electrode and the first electrode The bioelectricity acquired using any one of the first electrode and the plurality of second electrodes when the acquisition unit for acquiring a bioelectric signal and the acceleration sensor detect a change in posture of the living body. And a switch for selecting one bioelectric signal among the signals.

  The switch may select the bioelectric signal having the highest R wave detection accuracy of the electrocardiogram signal.

  The switch may select the bioelectric signal having the highest peak-to-peak height of the R wave of the electrocardiogram signal.

  At least one of the plurality of second electrodes may be disposed at a position where it can come into contact with at least a shoulder portion and a part of the scapula portion of the living body.

  In the bioelectric signal acquisition method of the present invention, the bioelectric signal is acquired from an electrode that is installed at a predetermined position of the clothes and detects the bioelectric signal of the living body when it contacts the living body wearing the clothes. A bioelectric signal acquisition method for detecting a change in posture of the living body using an acceleration sensor, and a bioelectric signal using a first electrode and a plurality of second electrodes different from the first electrode And when the acceleration sensor detects a change in posture of the living body, among the bioelectric signals acquired using any of the first electrode and the plurality of second electrodes, Selecting one bioelectric signal.

  As described above, the bioelectric signal acquisition system of the present invention is configured to select the bioelectric signal acquired from the electrode in accordance with the change in the posture of the living body wearing the clothes on which the electrode is installed. The bioelectric signal can be accurately detected over a long period of time.

FIG. 1 is a diagram illustrating an example of the installation position of a wearable electrode according to an embodiment of the present invention. FIG. 2 is a diagram illustrating another example of the installation position of the wearable electrode according to the embodiment of the present invention. FIG. 3 is a diagram illustrating another example of the installation position of the wearable electrode according to the embodiment of the present invention. FIG. 4 is a diagram showing a configuration example of the bioelectric signal acquisition system according to the embodiment of the present invention. FIG. 5 is a diagram showing a measurement example of the peak-to-peak height of the R wave when electrodes are placed on the right chest, upper left back, and upper right back. FIG. 6 is a diagram showing another configuration example of the bioelectric signal acquisition system according to the embodiment of the present invention. FIG. 7 is a diagram showing a configuration example of an electrode according to the embodiment of the present invention. FIG. 8 is a diagram illustrating a configuration example of the bioelectric signal acquisition system according to the first embodiment of the present invention. FIG. 9 is a configuration example of the bioelectric signal acquisition apparatus according to the first embodiment of the present invention. FIG. 10 is a flowchart of the bioelectric signal acquisition method according to the first embodiment of the present invention. FIG. 11 is a diagram showing a configuration example of a bioelectric signal acquisition system according to the second embodiment of the present invention. FIG. 12 is a configuration example of a bioelectric signal acquisition apparatus according to the second embodiment of the present invention. FIG. 13 is a flowchart of the bioelectric signal acquisition method according to the second embodiment of the present invention. FIG. 14 is a diagram illustrating a configuration example of a conventional wearable electrode.

  Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, in the drawings used in the following embodiments, it is described that the electrode to be installed is installed on the outside of the clothing, but in practice the clothing can be in contact with the human body surface. It is installed inside. The same applies to other embodiments.

[Wearable electrode installation position]
FIG. 1 is a diagram illustrating an example of the installation position of a wearable electrode according to an embodiment of the present invention. In the example of the installation position of FIG. 1, since electrodes are installed on the left chest 41 and upper back 43 near the heart 20, the recorded electrocardiographic waveform has a higher R wave PTP height than when placed on the right chest. Can be detected. Furthermore, if an electrode is placed in a region including a position along the cardiac electrical axis (QRS axis) 30 when a healthy human R wave is emitted, the P wave height of the R wave is increased and the detection accuracy of the R wave is improved. be able to.

  Another example of the installation position of the wearable electrode according to the embodiment of the present invention is shown in FIG. In the example of the installation position in FIG. 2, at least one electrode is provided on each of the upper left back 45 and the upper right back 44. As a result, the electrode contacts the upper back 44 or 45 in either the right-side or left-side posture, and the electrode does not deviate from the human body surface due to a change in posture or the like, and it extends over a long period of time. R wave can be detected. Further, a combination of electrodes having a higher R wave PTP height is selected from the combination of the electrodes of the left chest 41 and the upper left back 45 and the electrodes of the left chest 41 and the upper right back 44. Accordingly, it is possible to select an electrode combination installed in a region including a position along the cardiac electrical axis (QRS axis) 30 of a healthy person.

  Another example of the installation position of the wearable electrode according to the embodiment of the present invention is shown in FIG. In the configuration example of FIG. 3, at least one electrode is provided on each of the upper left back 45, the upper right back 44, the right chest 42, the right abdomen 46, and the left abdomen 47, so It is possible to select a combination of electrodes having a higher R-wave PTP height from among the electrode combinations installed in 1. In addition, even in a measurement subject having a cardiac axis deviation, an electrode combination installed in a region including a position along the cardiac electrical axis (QRS axis) 30 when the R wave is emitted can be selected. In the recorded electrocardiographic waveform, the PTP height of the R wave is increased, and the detection accuracy of the R wave can be improved.

[Configuration of bioelectric signal acquisition system]
FIG. 4 is a diagram showing a configuration example of the bioelectric signal acquisition system according to the embodiment of the present invention. The bioelectric signal acquisition system shown in FIG. 4 includes a garment 10, a bioelectric signal acquisition device 60, electrodes 51 and 53 that are installed inside the garment 10 so as to be in contact with the body surface, and wiring 61. And 63. The wearable electrode includes an electrode 51 in contact with the left chest of the human body and an electrode 53 in contact with the upper right back. The electrode 51 is placed in the region 41 shown in FIG. 1, and the electrode 53 is in the region 43 shown in FIG. Is installed.

  In FIG. 4, the electrode 53 is installed at a position on the garment 10 that is almost the same height as the electrode 51, but at least a position that is the same height as the electrode 51 or a position that is higher than the position where the electrode 51 is installed. The electrodes can also be placed in a region that includes a position along the healthy human cardiac electrical axis (QRS axis).

  Further, the electrode 51 is connected to the positive electrode or the negative electrode of the bioelectric signal acquisition device 60 by the wiring 61, and the electrode 53 is connected to the negative electrode or the positive electrode of the bioelectric signal acquisition device 60 by the wiring 63. The electrodes 51 and 53 are configured so that the waveform of the R wave can be measured.

  Here, the materials of the electrodes 51 and 53 are not particularly limited, and a commercially available medical Ag / AgCl electrode with an electrolyte paste, a carbon filler mixed resin, an Ag cloth, a conductive polymer-impregnated cloth, or a cloth soaked with an electrolyte solution. Etc. can be used.

  In addition, the size and number of the electrodes 51 and 53 are not particularly limited as long as the size and number are included in the installed region. If an electrode of a size that includes a part that is in good contact with the human body surface, for example, both sides, a scapula, etc., is installed on the structure of the garment 10, contact between the electrode and the human body surface even if the measurement subject moves. It becomes easy to maintain the state, and an effect is obtained that a bioelectric signal can be obtained with high accuracy over a long period of time.

  If at least one electrode is placed in multiple positions on the clothes so that at least one electrode is always in contact with the human body surface, bioelectric signals can be stably acquired even when the subject moves. Is possible. The same applies to other embodiments described below.

  In addition, regarding the reference potential used at the time of biosignal acquisition, a separate reference electrode may be provided on the clothes 10 so as not to contact the electrodes 51 and 53 and connected to the bioelectric signal acquisition apparatus 60. Further, an intermediate potential obtained from signals received by the positive electrode and the negative electrode may be forcibly applied as a reference potential, or the potential of the circuit GND (Ground) of the bioelectric signal acquisition device 60 may be used.

  For the wirings 61 and 63, known wiring materials can be used without limitation. However, since the wirings 61 and 63 are installed on the clothes 10 that are deformed by the movement of a human, for example, the wiring materials themselves can be expanded and contracted like conductive rubber. It is more desirable to have a flexible structure or to have a stretchable structure / layout like a spring. Moreover, it is desirable to coat with an insulator so as not to acquire a signal from a human body or the like other than the electrode installation site.

  The bioelectric signal acquisition apparatus 60 includes at least a positive electrode and a negative electrode, and a known bioelectric signal acquisition apparatus that acquires an electrocardiographic waveform and detects an R wave can be used without any particular limitation.

  FIG. 5 shows the PTP height of the R wave of the electrocardiogram waveform obtained when the electrode 51 is placed on the left chest 41 and the electrode 53 is placed on the upper left back 45 or the upper right back 44, respectively. The result of the comparative measurement based on the case where it is placed on the chest is shown. Compared with the case where the electrode is placed on the right chest, when the electrode is placed on the upper back, an R wave PTP height of 1.5 times or more is obtained.

  In addition, if an electrode on the upper right back having a higher PTP height is selected, an electrode installed in a region including a position along a healthy human cardiac electrical axis (QRS axis) 30 can be selected. The detection accuracy can be further improved.

  FIG. 6 is a diagram illustrating another configuration example of the bioelectric signal acquisition system according to the embodiment of the present invention. The bioelectric signal acquisition system shown in FIG. 6 includes a garment 10, a bioelectric signal acquisition device 60, electrodes 51 and 54 that are provided inside the garment 10 so as to be in contact with the body surface, and wiring 61. And 64. The wearable electrode includes an electrode 51 in contact with the left chest 41 of the human body and an electrode 54 in contact with the upper right back 44. The electrode 51 is installed in the region 41 shown in FIG. 1, and the electrode 54 is shown in FIG. It is installed in the area 44 shown.

  In the wearable electrode of FIG. 6, the electrode 54 is installed at a position including at least the shoulder and the scapula in the upper right back 44, thereby preventing the electrode and the body surface from being separated due to a change in posture or the like. According to this configuration, the electrode 54 can be placed on the upper right back regardless of the posture of the human body, without particularly adopting a configuration for increasing the degree of adhesion between the electrode and the human body, for example, a configuration in which the electrode portion is tightened with an elastic material. 44 can be contacted.

  FIG. 7 is a diagram showing a configuration example of the electrode according to the embodiment of the present invention, and is a diagram for more specifically explaining the configuration of the electrode according to the embodiment of the present invention. As is clear from this figure, regardless of the posture of the human body (standing position, sitting position, and prone position), the electrode 54 and the contact portion 80 that can contact at least part of the scapula portion from the shoulder portion on the surface of the human body are provided. Can do. This prevents the electrode and the human body from being separated from each other due to a change in the posture of the human body, can detect the R wave with high accuracy, and can detect the R wave over a long period of time.

[First Embodiment]
FIG. 8 is a diagram illustrating a configuration example of the bioelectric signal acquisition system according to the first embodiment of the present invention. In the bioelectric signal acquisition system shown in FIG. 8, in addition to the configuration described in FIG. 6, an electrode 55 installed on the upper left back 45 and a wiring 65 connecting the electrode 55 and the bioelectric signal acquisition device 60 are further provided. I have.

  FIG. 9 is a configuration example of the bioelectric signal acquisition apparatus according to the first embodiment of the present invention. The bioelectric signal acquisition device 60 of FIG. 9 includes a waveform recording unit 70, a PTP height comparison unit 71, and a changeover switch 72.

  In this configuration example, the positive electrode or the negative electrode is connected to the electrode 51, and the remaining negative electrode or the positive electrode is connected to the electrode 54 or the electrode 55 via the changeover switch 72. The bioelectric signal acquisition device 60 acquires a bioelectric signal for a predetermined time in each of the combination of the electrode 51 and the electrode 54 and the combination of the electrode 51 and the electrode 55, and acquires the biosignal acquired from the two electrode combinations. A combination of electrodes having a large PTP height is selected, and a biological signal is acquired with the selected combination of electrodes.

  According to this configuration example, as compared with the case of FIG. 6, wearable electrodes are first installed on both the upper left back 45 and the upper right back 44. In any posture, it is possible to always ensure contact of at least one of the electrodes on the upper left back and the upper right back with the upper back of the human body.

  Furthermore, by selecting the combination of the electrode having a higher R wave PTP from among the combination of the left chest electrode 51 and the upper left back electrode 55 and the left chest electrode 51 and the right upper back electrode 55 It is also possible to select an electrode combination installed in a region including a position along the cardiac electrical axis (QRS axis) 30 of a healthy person, and to detect an R wave with high detection accuracy.

  The waveform recording unit 70, the PTP height comparison unit 71, and the changeover switch 72 may be configured with existing circuit configurations and circuit components, respectively.

  FIG. 10 is a flowchart of the bioelectric signal acquisition method according to the first embodiment of the present invention. In the bioelectric signal acquisition method of the present invention, first, the switch 72 is set so that the waveform recording unit 70 and the electrode 54 are connected (S1-1), and the waveform of the bioelectric signal A is acquired from the electrode 54. (S1-2). Next, the switch is switched so that the waveform recording unit 70 and the electrode 55 are connected (S1-3), and the waveform of the bioelectric signal B is acquired from the electrode 55 (S1-4).

  Next, the PTP heights of the measured bioelectric signals A and B are compared (S1-5), and the switch 72 is set so as to be connected to the electrode having the higher PTP height (S1-6). ) To obtain the bioelectric signal A or B (S1-7).

  Here, step 1 (S1-1 to S1-4) and step 2 (S1-5 to S1-6) in FIG. 10 (hereinafter collectively referred to as “calibration step”) are the measurement steps (S1-7). However, the present invention is not limited to this, and the calibration step may be periodically performed every time the measurement step is performed. Thereby, the electrode which acquires a bioelectric signal can be switched regularly.

  Further, a calibration start button may be further provided on the wearable electrode, and the calibration step may be started by pressing the calibration start button at a timing desired by the measurement subject. The calibration step may be automatically started each time the posture of the person to be measured changes.

  At this time, a reference electrode for applying a reference potential to the bioelectric signal acquisition device 60 is further provided, and the electrode 54 or the electrode 55 that is not connected to the positive electrode or the negative electrode of the bioelectric signal acquisition device 60 in each step is It is good also as a structure connected to the said reference electrode.

  As described above, according to the present embodiment, by disposing at least one of the electrodes on the upper left back and the upper right back on the upper back, the difference between the electrode and the body surface due to a change in posture or the like. Can be prevented. It is also possible to select an electrode combination at a position along the cardiac electrical axis 30 by selecting an electrode combination having a higher R wave PTP from among the two electrode combinations, and to detect the R wave with high accuracy. It is possible to detect R waves over a long period of time.

[Second Embodiment]
FIG. 11 is a diagram showing a configuration example of a bioelectric signal acquisition system according to the second embodiment of the present invention.

  The bioelectric signal acquisition system shown in FIG. 11 includes an electrode 52 on the right chest, an electrode 56 on the right abdomen, and an electrode 57 on the left abdomen in addition to the configuration shown in FIG. , A wiring 66 that connects the electrode 56 and the bioelectric signal acquisition device 60, and a wiring 67 that connects the electrode 57 and the bioelectric signal acquisition device 60.

  Although FIG. 11 shows an example of a configuration in which electrodes are provided on the right chest, right abdomen, and left abdomen, it is not necessary to install electrodes at all positions, and the location of the electrodes to be installed can be selected as appropriate. That's fine. For example, electrodes may be installed on the left chest, right chest, upper right back, and upper left back.

  The bioelectric signal acquisition device 60 of the present invention shown in FIG. 12 includes a waveform recording unit 70, a PTP height comparison unit 71, and a changeover switch 72. The positive electrode or the negative electrode is connected to the electrode 51, and the remaining negative electrode Alternatively, the positive electrode is connected to any one of the electrode 52, the electrode 54, the electrode 55, the electrode 56, and the electrode 57 through the changeover switch 72.

  In the present configuration example, a combination of the electrode 51 and the electrode 52, the combination of the electrode 51 and the electrode 54, the combination of the electrode 51 and the electrode 55, the combination of the electrode 51 and the electrode 56, and the combination of the electrode 51 and the electrode 57 are respectively In the meantime, a bioelectric signal is acquired, and a combination of electrodes having the largest PTP height of the acquired biosignal is selected from among the combinations of the five electrodes, and a biosignal is acquired with the selected combination of electrodes.

  Also in this configuration example, the waveform recording unit 70, the PTP height comparison unit 71, and the changeover switch 72 may be configured by existing circuit configurations and circuit components, respectively.

  FIG. 13 is a flowchart of the bioelectric signal acquisition method according to the second embodiment of the present invention. In the bioelectric signal acquisition method of the present invention, as in FIG. 10, first, the switch 72 is set so that the waveform recording unit 70 and the electrodes 52, 54, 55, 56, 57 are sequentially connected (S2- 1) The waveform (AE) of a bioelectric signal is acquired from each electrode (S2-2).

  Next, the PTP heights of the measured bioelectric signals (A to E) are compared (S2-3), and the switch 72 is set so as to be connected to the electrode having the highest PTP height (S2- 4) One of the bioelectric signals (A to E) is acquired (S2-5).

  Here, as in FIG. 10, the “calibration step” of step 1 (S2-1, S2-2) and step 2 (S2-3, S2-4) in FIG. 13 is the measurement step (S2-5). However, the present invention is not limited to this, and it may be performed periodically each time a predetermined time measurement step is performed to switch the electrode for obtaining the bioelectric signal.

  Further, a calibration start button may be further provided on the wearable electrode, and the calibration step may be started by pressing the calibration start button at a timing desired by the measurement subject. A sensor may be provided so that the calibration step is automatically started every time the posture of the person to be measured changes.

  At this time, a reference electrode for applying a reference potential to the bioelectric signal acquisition device 60 is further provided. Of each of the electrodes 52, 54, 55, 56, and 57, the bioelectric signal acquisition device 60 includes the reference electrode. A configuration in which either the electrode that is not connected to the positive electrode or the negative electrode, or all the electrodes that are not connected to the positive electrode or the negative electrode of the bioelectric signal acquisition device 60 are connected to each other via a resistance of 5 kΩ or more is connected to the reference electrode. Also good.

  As described above, according to the embodiment of the present invention, the region including the position along the cardiac electrical axis (QRS axis) of the person to be measured who measures the electrocardiogram (for example, a healthy person, near the heart By installing wearable electrodes on the left chest and upper back), the P wave height of the R wave is increased in the recorded electrocardiogram waveform, and the detection accuracy of the R wave can be improved.

  In addition, by placing the wearable electrode on the upper left back and upper right back, at least one of the electrodes on the upper left back and upper right back in both the right and left positions It is possible to always ensure contact with the upper back of the human body.

  Furthermore, by selecting a combination of an electrode having a higher R wave PTP height from among a combination of the left chest electrode and the upper left back electrode and a combination of the left chest electrode and the upper right back electrode, It is also possible to select an electrode combination installed in a region including a position along the cardiac electrical axis (QRS axis) 30 of a person, and it is possible to detect an R wave with high detection accuracy.

  Furthermore, wearable electrodes are placed on the upper left back, upper right back, right chest, right abdomen, and left abdomen, and the combination of the electrodes placed on the left chest and the electrodes placed at the five locations described above is more R If a combination of electrodes with a high wave PTP is selected, even in the measurement subject who has a cardiac axial deviation, a region including a position along the cardiac electrical axis (QRS axis) when the R wave is emitted Since it is possible to select the electrode combination installed in the R wave, the R wave PTP height is increased, and the detection accuracy of the R wave can be improved.

  INDUSTRIAL APPLICABILITY The present invention can be used for a bioelectrode used for acquiring heartbeat and electrocardiogram waveforms on a daily basis and a bioelectric signal acquisition system using the bioelectrode.

DESCRIPTION OF SYMBOLS 10 ... Clothes, 20 ... Heart, 30 ... Cardiac electrical axis, 41 ... Left chest, 42 ... Right chest, 43 ... Upper back, 44 ... Upper right back, 45 ... Upper left back, 46 ... Right abdomen, 47 ... Left abdomen 51 ... Left chest electrode, 52 ... Right chest electrode, 53 ... Upper back electrode, 54 ... Upper right back electrode, 55 ... Upper left back electrode, 56 ... Right abdominal electrode, 57 ... Left abdominal electrode, 60 ... Bioelectric signal Acquiring device, 61-67 ... wiring, 70 ... waveform recording part, 71 ... PTP height comparison part, 72 ... switch, 80 ... contact part.

Claims (5)

A bioelectric signal acquisition system for acquiring a bioelectric signal from an electrode for detecting a bioelectric signal of the living body when it is installed at a predetermined position of the clothes and contacts a living body wearing the clothes,
An acceleration sensor for detecting a change in posture of the living body;
An acquisition unit that acquires a bioelectric signal using a first electrode and a plurality of second electrodes different from the first electrode;
When the acceleration sensor detects a change in the posture of the living body, one bioelectric signal among bioelectric signals acquired using either the first electrode or the plurality of second electrodes is obtained. A bioelectric signal acquisition system comprising: a switch to be selected. The bioelectric signal acquisition system according to claim 1, wherein the switch selects the bioelectric signal having the highest R wave detection accuracy of an electrocardiogram signal. The bioelectric signal acquisition system according to claim 1, wherein the switch selects the bioelectric signal having the highest peak-to-peak height of the R wave of the electrocardiogram signal. 4. The device according to claim 1, wherein at least one of the plurality of second electrodes is disposed at a position that can contact at least a shoulder portion and a part of the scapula portion of the living body. The bioelectric signal acquisition system according to item. A bioelectric signal acquisition method for acquiring a bioelectric signal from an electrode that is installed at a predetermined position on clothes and detects a bioelectric signal of the living body when contacting a living body wearing the clothes,
Detecting a change in posture of the living body with an acceleration sensor;
Obtaining a bioelectric signal using a first electrode and a plurality of second electrodes different from the first electrode;
When the acceleration sensor detects a change in the posture of the living body, one bioelectric signal among bioelectric signals acquired using either the first electrode or the plurality of second electrodes is obtained. Selecting the bioelectric signal.

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