Attempts to Noninvasive Measurement of Internal Muscle Temperature by Using Multiple Frequency Impedance
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.40 Vol.40】
ABSTRACT
In the human body, electric resistance varies depending on the temperature of themuscle tissue. In the present study, the effect of cooling on electric resistance wasinvestigated using multi-frequency impedance device while cooling the aorta in thepopliteal region in addition to local cooling from the skin surface of the triceps surae.Subjects were ten healthy male students （age: 21.1±1.5 years） of our university.Impedance was measured by the tetrapolar impedance method using a multi-frequencyimpedance device （MFBIA-07, Tanita） with a frequency at 50 kHz, 100 kHz and250 kHz. The current （I） electrodes and the sensing （V） electrodes were attachedlongitudinally to the calf. In order to measure impedance, the distance between the twosensing（ V） electrodes were placed at a distance of 15cm. The current electrodes wereset at 2cm, 3cm, and 4cm from the V electrode on the distal side. Measurements wereobtained following either cooling of the sural region only or cooling of the sural and the popliteal region. During cooling, impedance and skin temperature were measured every5 minutes for 30 minutes. Temperature was measured at 2cm, 3cm, and 4cm depthsfrom the skin surface of the triceps surae. Under both cooling conditions, a decrease intemperature was observed over time. In addition, the changes in cooling temperaturedecreased with increase in depth from the skin surface. The effect of cooling wasgreater while cooling the aorta in the popliteal region than while cooling the suralregion only. Therefore, the cooling effect could be enhanced by cooling the aorta on thecentral side with simultaneous local cooling.
DECENTE SPORTS SCIENCE Vol.40/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
In the human body, electric resistance varies depending on the temperature of themuscle tissue. In the present study, the effect of cooling on electric resistance wasinvestigated using multi-frequency impedance device while cooling the aorta in thepopliteal region in addition to local cooling from the skin surface of the triceps surae.Subjects were ten healthy male students （age: 21.1±1.5 years） of our university.Impedance was measured by the tetrapolar impedance method using a multi-frequencyimpedance device （MFBIA-07, Tanita） with a frequency at 50 kHz, 100 kHz and250 kHz. The current （I） electrodes and the sensing （V） electrodes were attachedlongitudinally to the calf. In order to measure impedance, the distance between the twosensing（ V） electrodes were placed at a distance of 15cm. The current electrodes wereset at 2cm, 3cm, and 4cm from the V electrode on the distal side. Measurements wereobtained following either cooling of the sural region only or cooling of the sural and the popliteal region. During cooling, impedance and skin temperature were measured every5 minutes for 30 minutes. Temperature was measured at 2cm, 3cm, and 4cm depthsfrom the skin surface of the triceps surae. Under both cooling conditions, a decrease intemperature was observed over time. In addition, the changes in cooling temperaturedecreased with increase in depth from the skin surface. The effect of cooling wasgreater while cooling the aorta in the popliteal region than while cooling the suralregion only. Therefore, the cooling effect could be enhanced by cooling the aorta on thecentral side with simultaneous local cooling.
DECENTE SPORTS SCIENCE Vol.40/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Hideaki Komiya*1, Naoyuki Kurokawa*2 |
|---|---|
| University or institution | *1Utsunomiya University, *2Miyagi University of Education |
Keywords
electrical impedance, internal muscle tamperature, non-invasive measurement, icing, human body