| Keywords |
Cold water immersion ; Varied dietary composition ; Body temperature ; Cardiopulmonary respiratory ability |
| Abstract |
The purpose of this study was to find out how the change of dietary composition would affect body temperature and cardiopulmonary respiratory when exercised in cold water immersion. The eight healthy who had no medical problems underwent three tests such as treadmill exercise in the air, ergometer exercise in the air and ergometer exercise in water, so that the maximal exercise power could be measured. In addition, during six weeks they took high carbohydrate, high fat, and high protein diet in random order for two weeks each. After each dietary maneuver, the subjects performed ergometer exercise for 60 minutes in 20oC water. During the exercise, core temperature was measured by a thermocouple from the anus. No differences were found in rectal temperature during exercise in 20oC water among three conditions of the varied dietary composition. Exercise performance indicated by the changes of HR, VO2, and RER were not different among three conditions. In conclusion, the three dietary compositional conditions of macronutrients did not modify the body temperature and exercise performance during exercise of moderate intensity in 20oC water. It appeared that both thermic effects of each nutrient and exercise may resulted in these responses, and the body maintained homeostasis even with varied dietary composition. The sustained thermoregulatory responses seemed to contribute to an appropriate exercise function. |