THERMAL RESPONSES TO SWIMMING : THE INFLUENCE OF LONG SWIMSUITS

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PURPOSE : The purpose of this study was to clarify the thermal effect of wearing the new long type swimsuits (BODYSUITS) during prolonged swimming. METHODS : We tried to measure the skin temperature during swimming using a new small temperature logger. The logger which has three functions (sensor, 2040 data point memory, built-in power : Temperature logger 3650, HIOKI, Japan). The subjects were 12 male college competitive swimmers aged 20.2±1.3 yr, height 174.0±6.4 cm, body weight 69.1±7.7 kg, %Fat 17.7±3.1 %. All the subjects trained regularly for 2-3 hours a day, 5-7 times a week. The subjects swam 1500 m at maximum effort in a front crawl stroke with two types of competitive swimsuits in water temperatures of 30.15℃ and 28.90℃. The temperature loggers were attached to the swimmer's calf, thigh, abdomen, chest, and forearm. Those skin temperatures were measured throughout the swim at one minute intervals. Body temperature (oral : Tb), rating of perceived exertion (RPE), and perceived thermal sensation of the head (TSH) and body (TSB) were measured on completion of the swim. RESULTS : There were no significant differences in Tb (37.4±0.2, 37.2±0.2℃) for the BODYSUITS and regular swimsuits, respectively. The mean skin temperatures during the swim for the BODYSUITS and regular swimsuits were 33.0±0.38 and 32.6±0.35℃, respectively (p<0.05). There were significant differences in TSB (6.5±0.8, 5.6±>0.2) and TSH (7.1±0.3, 5.9±0.6) for the long and regular swimsuits, respectively (p<0.05). The mean skin temperature during the swim for BODYSUIT were higher in the water temperature of 30.15℃. CONCLUSION : The thermal responses to swimming wearing the BODYSUITS were significantly higher than wearing the regular swimsuits in the water temperature high (around 30℃). Therefore, swimmers might be required to pay more attention to the consequences of wearing the BODYSUITS during prolonged/high intensity swimming in a warm water environment.