Articles : The Effects of Exercise Intensity on Thermophysiological Responses

Journal of Exercise Nutrition & Biochemistry 2003;7(1):41-48.

Abstract

I
n order to find the effects of exercise intensity on thermophysiological responses depending on the exercise time and grade of intensity, 7 healthy made students enrolled in the W University who have similar physical constitutions were selected as modal group. They underwent the tests to determine the change and difference of physical conditions depending on the exercising intensities divided by 30% V O_(２)max, ventilation threshold intensity and 75% V O_(２)max for each span on the exercising intensities divided by 30% V O_(２)max, ventilation threshold intensity and 75% V O_(２)max for each span of time divided by 5min, and 10min, 15min and 20min, during the stable perduring the restoring period, respectively. The outcomes of the tests are summed up as follows; 1. The temperature of the rectum (or the temperature inside the body) remains unchanged or slightly goes down at the beginning or exercise. The exercise group of 75% V O_(２)max only shows a significant difference (P<.01) depending on the span of time gut there are no significant differences depending on the intensity. 2. The temperature for body parts remains stable on falls slightly at the beginning of exercise for each grade of intensity. But at the exercise intensity lower than of ventilation threshold, the skin temperature of the exercising body parts falls below that of stable period except for the instep of both feet. In the exercise group of 75% V,O_(２)max, the skin temperature of the thighs, lower legs, trunk and feet seems to rise. From the above conclusions, it can be said that the thermophysiological response during and after exercise is a kind of fundamental defense mechanism of our body to maintain the homeostasis. It is thus thought that the heavier exercise that the intensity level of ventilation threshold makes our body react more actively to the thermophyiological responses because the thermophysiological responses depending on the exercise intensity , as tested in this study, show statistically significant difference in the ecercise group of ventilation threshold.

Key Words: skin temperature, exercise intensity, treadmill