KR20090027390A - Methodology and apparatus for portable and wearable type exercise electrocardiography - Google Patents

Abstract

A method and a portable and wearable apparatus for measuring exercise electrocardiography are provided to monitor an exercising state and a health state by performing an exercise monitoring function of a subject. An exercise electrocardiography sensor unit(11) measures a pulse, oxygen saturation, and a blood pressure. The exercise electrocardiography sensor unit includes a red light source(12), a near infrared light source(13), and an optical sensor(14) for measuring the pulse and oxygen saturation, and an optical source(15) and an optical sensor(16) for measuring a pulse transmission speed. A signal processor(21) for processing a signal includes a central processing unit(22) for producing a measurement value of the subject based on the measured value. The signal processing unit includes a personal information input unit(23) for inputting personal information of the subject. The signal processing unit includes a display unit(24) displaying the measurement value of the subject produced by the central processing unit. The signal processing unit includes a memory unit(25) for storing the individual information and the produced measurement value.

Description

Portable and wearable exercise load measuring device and measuring method {Methodology and Apparatus for Portable and Wearable Type Exercise Electrocardiography}

The present invention relates to a portable measuring device that measures the pulse, blood oxygen concentration, blood pressure, etc. of the subject to instruct the subject to the most appropriate exercise amount, and allows the subject to adjust the exercise amount by the displayed exercise load. The purpose of the exercise is to display the exercise load to the person to help determine the appropriate amount of exercise.

People who are normally healthy are suddenly killed during sports and death. Most of these sudden deaths and sports deaths are thought to be caused by latent diseases (ischemic heart disease, angina pectoris, etc.), and these cases usually die within 24 to 48 hours. It is important to prevent these accidents by checking the exercise load test to determine the presence of latent diseases and to determine the extent of exercise.

To prevent unfortunate accidents caused by exercise, you need to exercise appropriately for your fitness. Exercise load measurement is a prerequisite for setting exercise limit and proper exercise amount of exercisers, especially during continuous exercise after 40s, by setting safety measures by measuring exercise load and measuring exercise load. And unfortunate accidents such as sports companies can be prevented.

How to measure the exercise load of the exerciser can be largely divided into two types. The first is to measure the isotonic exercise load by walking, running and cycling, which is the dynamic exercise, and the second is isometric exercise load which increases the tension without changing the length of the muscle. In general, isotonic exercise load is associated with heart rate and oxygen uptake, and blood pressure × heart rate, which is an indicator of myocardial oxygen demand, is involved. Except in special cases, the exercise load test uses a lot of isotonic exercise load tests.

In general, factors used to measure isotonic exercise load include heart rate, blood pressure, oxygen intake, ventilation rate, anaerobic threshold, respiratory exchange rate, resting metabolic rate, subjective exercise intensity, electrocardiogram, and target heart rate. Conventional exercise load measurement method mainly uses the ECG (Electrocardiogram; ECG) in the case of heart rate to measure the change in heart rate in exercise, oxygen intake is measured by wearing a mask to measure the respiratory volume during exercise.

However, heart rate can be measured easily by various methods including ECG.However, measurement of oxygen intake and respiratory exchange rate including blood pressure requires expensive equipment, and exercisers must wear a face mask and exercise. It is inconvenient for the measurer, and there is a disadvantage that easy measurement is difficult. In order to improve this, there is a method of calculating the oxygen intake according to the exercise amount of various exercise equipment including treadmill, but it is difficult to calculate the exact value for each individual by calculating the oxygen intake by statistical value rather than the actual measured value. .

Accordingly, the present invention has been made to solve the conventional problems as described above, and is not portable and relates to a portable and inexpensive exercise load measuring device instead of expensive exercise load measuring equipment. It is possible to monitor the exercise amount of the subject, and it is possible to adjust the amount of exercise by detecting the over exercise state of the subject using the exercise, and to exercise by inputting the personal information (weight, height, fat mass, age, etc.) of the subject It is possible to determine the calorie consumption and the amount of exercise according to the purpose, and to connect individual devices (PC, PDA, mobile phone) to monitor the individual long-term exercise and health status of the subject.

In addition, because of the characteristics of the device, it is possible to add an additional device, so that the operation of the above-mentioned object can be continuously connected to the central server using a wired / wireless communication network to continuously monitor the exercise state and the health state of the subject.

 The portable and wearable exercise load measuring device and measuring method are designed to use PPG (non-invasive measurement method using optical method to avoid the complicated, expensive, and impossible to carry. Heart rate and blood pressure were measured by Photo-Plethysmography, and blood oxygen saturation was calculated using Pulse Oximeter. In addition, it was designed to monitor the amount of exercise of the subject and determine the amount of exercise of the subject, and to control the amount of exercise and alarm of dangerous situations.

Heart rate, blood pressure, and blood oxygen saturation to measure exercise load are measured using the following method.

1. Heart rate measurement using PPG signal

The measurement of the PPG signal is defined by the Beer-Lambert law shown in Equation 1 for the intensity of the projected and transmitted light when it is projected at a given wavelength and passes through a homogeneous medium.

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In Equation 1, I ₀ is the projected light intensity, I is the light intensity transmitted and reflected in the tissue, Ext is the absorption coefficient in the tissue, c is the concentration of the tissue, d is the thickness of the tissue.

Measurement of the heart rate by the transmission and reflection of light to blood vessels and blood that are changed by the heartbeat as shown in FIG. 1 for tissues, blood vessels, blood, and bones according to Beer-Lambert law when light is applied to living tissues This is possible.

2. Measurement of blood pressure using PPG signal

Blood pressure measurement using PPG is measured using the pulse wave propagation time. To measure the pulse wave propagation time, we measure the PPG signal between two points and calculate the pulse wave propagation time using each measurement value. Here, the relation between the blood pressure and the pulse wave propagation time uses an equation regarding pressure and volume, which is expressed as in Equation 2.

Where v is the velocity of the pulse wave, ρ is the density of blood, V is the volume of blood, ΔV is the volume of blood, and ΔP is the change of blood pressure. Assuming that the density of blood is constant, Equation 2 can be expressed simply as in Equation 3, which can estimate blood pressure from the pulse wave velocity and the blood volume change.

3. Measurement of Oxygen Saturation in Blood Using PPG Signal

The PPG signal is measured using the difference in absorption coefficient of light between Oxyhemogrobin and Reduced Hemoglobin, depending on the wavelength of light at the heart rate. Figure 2 shows the absorbance of hemoglobin in the blood according to the wavelength, the main wavelength used for the measurement of PPG uses red light and infrared light whose absorption characteristics change depending on the wavelength of hemoglobin oxide and hemoglobin. In the case of the red light, the center wavelength of the light source is mainly used, the light having the center wavelength of 650 ~ 670nm, and in the case of the infrared light, the light having the center wavelength of 890 ~ 940nm.

Oxygen saturation can be obtained by using Equation 4 for the measured PPG signal.

Oxygen saturation obtained by Equation 4 is a percentage value of oxidized hemoglobin to the sum of oxidized hemoglobin and hemoglobin in the blood, and generally has a value close to 100% in a healthy person.

Specific details for the implementation of the exercise load measuring method presented in the above-mentioned problem solving means will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram showing a system of the exercise load measuring device that can be carried and worn according to the present invention. The exercise load sensor unit 11 for measuring pulse, oxygen saturation, and blood pressure (hereinafter, referred to as a measurement value) includes a red light source 12, a near-infrared light source 13, and an optical sensor 14 for measuring pulse and oxygen saturation. It consists of a light source 15 and an optical sensor 16 for measuring the pulse wave transmission speed. The signal processor 21 for signal processing the measured value includes a central processing unit 22 for calculating the measured value of the subject on the basis of the measured value, and a personal information input unit 23 for inputting the personal information of the subject. ), A display device 24 for displaying the measured value of the subject measured by the central processing unit, and a memory device 25 for storing personal information of the subject and the calculated measured value. The configuration can be configured independently and utilized as a dedicated measurement device, or additionally use other existing devices. In the case of adding and using another device as described above, it can be used as a means configured in the above-described motion load sensor unit and signal processing unit.

4 is a flow chart of the measurement value according to the present invention, as shown in step 110, the personal information of the subject, such as sex, age, height, weight, etc. of the subject is input through the personal information input unit of the subject; Measuring the pulse, which is a measuring element 111 through the exercise load sensor unit configured in the measuring device, measuring oxygen saturation 112, measuring blood pressure through pulse wave transmission time 113, measured value and blood Calculating the exercise load by using the physical characteristics of the measurer (114); displaying the calculated measurement value on the display device (115); alarm 116 and calculating when the calculated measurement value is in an over-exercise state; Storing the measured values 117.

FIG. 5 is an example in which the configuration shown in FIG. 4 according to the present invention is applied to a personal information terminal (PC, PDA, mobile phone, etc.) and a communication network. The exercise load measuring device 211 according to the present invention includes various wired and wireless communication devices. In addition, it is possible to store data through communication with the personal information terminal 212, and to facilitate the analysis and reading of various data through communication with the DB server 213. In addition, with the consent of the subject, the health center 214, the hospital 215, the welfare center 216 through the linkages with public institutions, such as the analysis of the amount of exercise, potential diseases and other health related records can be viewed and analyzed.

As described above, the portable and wearable exercise load measuring technology of the present invention is simple in configuration and simple to operate, and is widely applied to various wired, wireless communication and wired and wireless communication networks to the independent exercise load measuring device and the independent exercise load measuring device. This is possible.

According to the present invention having the above object and configuration, it is possible to accurately evaluate the individual's exercise ability through the measurement of heart rate, blood pressure, oxygen saturation during exercise, and based on this, the optimal exercise intensity, exercise time, number of exercise It can provide a back, to prevent accidental accidents during exercise, and can reduce the risk of accidents by informing the dangerous state in case of emergency. In addition, it is possible to provide the exercise load, the recording of the exercise amount, DBization and exercise prescription using a communication network through the modification and addition of the present device.

1 is a conceptual diagram of a change in the output of tissue incident light to blood vessels and blood

2 shows the absorption of blood components according to wavelength

3 is a block diagram of a mobile load measurement system that can be worn and worn

4 is a flow chart of the control device for portable and wearable exercise load

5 is an application example of the communication network of the mobile load measurement device that can be carried and worn

Claims (3)

In the method of measuring the exercise amount of the exerciser, the subject was measured using a biosignal measured by non-invasive PPG using light, blood pressure measurement using PTT, and oxygen saturation measurement using Pulse-Oximeter. Exercise load measurement method, characterized in that for measuring the exercise load. A portable and wearable exercise load measuring device comprising a sensor unit for measuring a biosignal, a signal processor for processing a biosignal, a central processing unit and a display unit for calculating an exercise load, and the biosignal measuring sensor unit is configured to display visible and near infrared light. Portable and wearable exercise load measuring device, characterized in that consisting of a light source and a photo detector used. According to claim 3, Portable and characterized in that the input and storage of the physical specific elements of the subject, the data storage unit capable of storing the amount of exercise and exercise load and the transmission, reception and storage of data using wired and wireless communication devices Wearable exercise load measuring device

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