Seven men, ages 19 to 33, served as subjects for the investigation of the thermophysiological effects of a triathlon performance in a warm humid environment. Each of the well-trained, acclimatized male triathletes performed a triathlon consisting of a 25 min swim, 75 min cycle ergometer ride and 40 min run. The cycle ride and run were performed in an environmental chamber at an intensity which produced 60-65% VO2 max in a neutral environment. Four environmental conditions were examined. The temperature and humidity for the neutral-dry condition (ND) was 21$\sp\circ$C/45%, the neutral-humid condition (NH) was 21$\sp\circ$C/83%, the warm-dry condition (WD) was 29$\sp\circ$C/45% and the warm-humid condition (WH) was 29$\sp\circ$C/45%. The environmental conditions were chosen to simulate environments typical of summer months in the southeastern and southwestern United States. A three-factor analysis of variance was used to analyze each dependent variable. Two of the main effects, temperature and humidity, were repeated over the third factor of time for each dependent variable. Significance was set at the 0.05 level. A Neuman-Keuls test was used to compare all significant pairs of means. Results showed significant interactions of heat with humidity resulting in higher heart rates, oxygen consumption, overall dehydrative weight loss and skin temperature in the WH condition. Ratings of perceived exertion for the WH triathlon demonstrated the same pattern when the results of the only Ironman Triathlete were not included. There was also an overall bronchodilation during triathlon performance in the WH environment. It is concluded that both skin and core temperature tend to rise with triathlon performance in the WH condition suggesting an escape from thermoregulatory control. It is important to note that although the instrumentation attests to quite a physiological / challenge with triathlon performance in the WH environment not all subjects will report the same perceived efforts. This could be a severe problem for medical supervision of triathlon events in such areas where conditions are usually warm and humid during the competition. / Source: Dissertation Abstracts International, Volume: 49-06, Section: A, page: 1401. / Major Professor: Emily M. Haymes. / Thesis (Ph.D.)--The Florida State University, 1988.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_76290 |
| Contributors | Cigna, Joseph Arnold., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 227 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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