Introduction: Human radiates heat generated by exercise by non-evaporative expansion of the skin blood vessel and evaporative sweat action to maintain body temperature. Meantime, this thermoregulatory sweating causes to loss in water and solute. Thus, many studies have examined how the fluid intake before and during exercise affects to sweating and exercise performance. Also, several studies have reported that there are changes in the sweating rates (SR) during exercises with different intensities. It has been shown that SR increase with increase in exercise intensity (Takano et al. 1996). However, little is known how changes in regional SR relate to body temperature changes in a relatively long period of exercise with moderate intensity. Purpose: This study examined how regional sweating was related to core and skin temperature during a relatively long period of aerobic exercise with moderate intensity. [Method] Eleven healthy young men (age, 22.1±2.9 years; mean±SD) exercised on a cycle ergometer at 55% VO2max for 40 minutes and sat a recovery for 40 minutes. Room temperature was set at 25 degrees. Before and after experiment, body mass (BM) was measured. SR was measured using a capsule with a small temperature-humidity sensor that measured the relative changes of humidity on the basis of the dry air by silica gel. SR and skin temperature was measured on the same 3 different regions; forehead, back and forearm. Tympanic membrane temperatures was measured as core temperature. Result: After the experiment, body mass was significantly lost about 0.45±0.15 kg. SR significantly increased in all 3 regions 10 min after the start of exercise and reached a peak value in the forehead at 15 min after the start of exercise, in the back at 20 min after the start of exercise, in the forearm at 30 min after the start of exercise. Skin temperature significantly increased in the forehead 10 min after the start of exercise and in the forearm 30 min after the start of exercise, whereas it significantly decreased in the back 20 min after exercise as compared to resting values. Core temperature significantly increased 15 minutes after the start of exercise until 15 minutes after exercise. During exercise and recovery, SR is correlated with changes in core and skin temperatures. Conclusion: This study suggests that changes in SR during and after exercise with moderate intensity are related to the core and skin temperature changes with some regional differences.
© Copyright 2014 19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. - 5. July 2014. Veröffentlicht von VU University Amsterdam. Alle Rechte vorbehalten.