Thermographic observations of the skin related with the arm exercise / 体力科学

ABSTRACT

To visualize skin temperatures during the dynamic and static arm exercises, a monochromatic thermograph was used.<BR>The thermoviewer JTG system presented a 5-monochromatic step-thermal display in centaral temperatures of 34.5 or 34.0°C and a temperature range of 2°C. The temperature resolving power of the system was 0.2°C. A 35 mm camera was used to take a synchronous thermogram of 2 sec scanning time.<BR>The experiments were carried out in August in an experimental room with an air temperature of 27.3±0.6°C, and a relative humidity of 50.5±4.3%.<BR>The skin temperatures of the forearm, upper arm and chest for five male subjects (18-25 yr) were observed before, during and after 5 min exercise on an arm ergometer at work intensities of 0, 2, 3 and 4 kg (dynamic exercise a rate of 40 contractions/min as timed with a metoronome) .<BR>The following results were obtained.<BR>1) Changes in skin temperatures were observed in detail and over a wide area during the dynamic and static exercises.<BR>2) The upper arm skin temperature increased as soon as that of the shoulder fell immediately after the beginning of dynamic exercise.<BR>3) The decrease in skin temperatures on the chest, shoulder and upper arm appeared with static exercise.<BR>4) The fall in skin temperature increased and spread from forearm toward chest with the incresse in static work intensity.