Since people are having more spare times (pastimes) and getting interested in their health care, a main concern of not only exercise but also outdoor wear is rapidly increasing. To protect our body from outdoor environment, it is important to regulate the local skin temperature keeping body temperat...
Since people are having more spare times (pastimes) and getting interested in their health care, a main concern of not only exercise but also outdoor wear is rapidly increasing. To protect our body from outdoor environment, it is important to regulate the local skin temperature keeping body temperature in homeostasis. This study was investigated measure the evaluation of physiological responses on functional T-shirts manufactured with selected materials by temperature change and sweating of body parts. Seven healthy men in twenties were tested in a climate chamber of 27±0.5℃ and 50±1%RH. In the experiment, half pant, socks and sneakers were given on the basis, three kinds of long arm T-shirts which were selectively sectioned according to the distribution of sweating and temperature change were worn. Four functional materials were selected for the 'Developed' T-shirts and 100% polyester for the control named 'Poly'. Three kinds of T-shirts for the experiment were 'Developed 1(D1)' T-shirts consisting functional materials considering sweat and temperature of every distributions of body, 'Developed 2(D2)' T-shirts with partially developed on necessarily body parts and 'Poly' T-shirts only consisting polyester. In an experiment of 90 minutes, which consisted of Rest, twice of Exercise and twice of Recovery periods, the sebjects were administered at 60% of VO2max with treadmill exercise. The temperature of rectal, chest skin and microclimate temperature with heart rate was measured every one minute. Entire and local sweat rate, and surface temperature of skin and clothing were measured using infrared thermography camera. From the analysis of rectal temperature, an immediate response did not show in the period of exercise, however, a rapid increase revealed after few minutes' exercise that continuous increase were kept showing even during the rest after excise. In the period of recovery, rectal temperature was slightly increased then decreased. 'Poly' T-shirts showed a distribution of high rectal temperature in general, whereas the 'D1' T-shirts showed that the lower rectal temperature was kept, it was supposed that the 'D1' T-shirts took less thermal stress than other T-shirts. Skin temperature showd a short decrease during early in exercise, but showed gradual increase. Increased skin temperature should work to inhibit the increase of core temperature by exercise. In recovery period, skin temperature demonstrated the lowest in 'D1' T-shirts with p<0.001 level that 'D1' T-shirts can radiate the sweat effectively to general areas after climbing or other exercise. In the microclimate temperature, no increase during exercise and decrease during recovery period were shown in 'D1' T-shirt'. With these in mind, 'D1' T-shirts could helps to keep the chest and back temperature low in the inner temperature of clothing by releasing suitable body heat loss From skin surface thermography when undressing after exercise, 'D1' T-shirts showed the slowest decrease in temperature of the chest and abdomen. 'D1' T-shirts seems to protect the decrease on abdomen after exercise by using quick absorbing/drying materials on those body parts. By considering the lowest temperature difference on 'D1' T-shirts from the analysis between surface and microclimate temperature, heat exchange from outside may activates the highest body heat lose. In sweat rate, 'D1' T-shirts quickly absorbed sweat and released it into atmosphere which showed lower amount of sweat rate and high effective sweat rate, whereas 'Poly' T-shirt which did not release the sweat into atmosphere showed high amount of sweat rate with low effective sweat rate. From the local amount of sweat, less remained sweats were found by the excellent absorptiveness of 'D1' T-shirts, whereas 'Poly' T-shirt with poor absorptiveness showed much remained sweats on the skin which caused high skin temperature. In the heart rate, 'D1' T-shirts showed the lowest increase than 2 other T-shirts, it may help the heart to have less pressure and better recovery after exercise. By analyzing the physiological responses, 'D1' T-shirts manufactured by combining four materials of quick absorbing/drying showed high maintenance in homeostasis of temperature rather than other T-shirts. By assuming the quick absorbing/drying T-shirts displaying its function as the exercise goes on the second half, it will be more effective for long hours exercise such as climbing rather than short hours exercise.
Since people are having more spare times (pastimes) and getting interested in their health care, a main concern of not only exercise but also outdoor wear is rapidly increasing. To protect our body from outdoor environment, it is important to regulate the local skin temperature keeping body temperature in homeostasis. This study was investigated measure the evaluation of physiological responses on functional T-shirts manufactured with selected materials by temperature change and sweating of body parts. Seven healthy men in twenties were tested in a climate chamber of 27±0.5℃ and 50±1%RH. In the experiment, half pant, socks and sneakers were given on the basis, three kinds of long arm T-shirts which were selectively sectioned according to the distribution of sweating and temperature change were worn. Four functional materials were selected for the 'Developed' T-shirts and 100% polyester for the control named 'Poly'. Three kinds of T-shirts for the experiment were 'Developed 1(D1)' T-shirts consisting functional materials considering sweat and temperature of every distributions of body, 'Developed 2(D2)' T-shirts with partially developed on necessarily body parts and 'Poly' T-shirts only consisting polyester. In an experiment of 90 minutes, which consisted of Rest, twice of Exercise and twice of Recovery periods, the sebjects were administered at 60% of VO2max with treadmill exercise. The temperature of rectal, chest skin and microclimate temperature with heart rate was measured every one minute. Entire and local sweat rate, and surface temperature of skin and clothing were measured using infrared thermography camera. From the analysis of rectal temperature, an immediate response did not show in the period of exercise, however, a rapid increase revealed after few minutes' exercise that continuous increase were kept showing even during the rest after excise. In the period of recovery, rectal temperature was slightly increased then decreased. 'Poly' T-shirts showed a distribution of high rectal temperature in general, whereas the 'D1' T-shirts showed that the lower rectal temperature was kept, it was supposed that the 'D1' T-shirts took less thermal stress than other T-shirts. Skin temperature showd a short decrease during early in exercise, but showed gradual increase. Increased skin temperature should work to inhibit the increase of core temperature by exercise. In recovery period, skin temperature demonstrated the lowest in 'D1' T-shirts with p<0.001 level that 'D1' T-shirts can radiate the sweat effectively to general areas after climbing or other exercise. In the microclimate temperature, no increase during exercise and decrease during recovery period were shown in 'D1' T-shirt'. With these in mind, 'D1' T-shirts could helps to keep the chest and back temperature low in the inner temperature of clothing by releasing suitable body heat loss From skin surface thermography when undressing after exercise, 'D1' T-shirts showed the slowest decrease in temperature of the chest and abdomen. 'D1' T-shirts seems to protect the decrease on abdomen after exercise by using quick absorbing/drying materials on those body parts. By considering the lowest temperature difference on 'D1' T-shirts from the analysis between surface and microclimate temperature, heat exchange from outside may activates the highest body heat lose. In sweat rate, 'D1' T-shirts quickly absorbed sweat and released it into atmosphere which showed lower amount of sweat rate and high effective sweat rate, whereas 'Poly' T-shirt which did not release the sweat into atmosphere showed high amount of sweat rate with low effective sweat rate. From the local amount of sweat, less remained sweats were found by the excellent absorptiveness of 'D1' T-shirts, whereas 'Poly' T-shirt with poor absorptiveness showed much remained sweats on the skin which caused high skin temperature. In the heart rate, 'D1' T-shirts showed the lowest increase than 2 other T-shirts, it may help the heart to have less pressure and better recovery after exercise. By analyzing the physiological responses, 'D1' T-shirts manufactured by combining four materials of quick absorbing/drying showed high maintenance in homeostasis of temperature rather than other T-shirts. By assuming the quick absorbing/drying T-shirts displaying its function as the exercise goes on the second half, it will be more effective for long hours exercise such as climbing rather than short hours exercise.
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