A Comparative Study on the Physiological Responses to Prolonged Exercise Between Swimming at Three Different Temperatures and Treadmill Walking

本研究考察了在三种不同水温下长时间游泳和在温和环境下室内行走的生理反应。研究结果总结如下：1。在33ºC的水中，直肠温度（Tre）在开始游泳后30分钟逐渐升高，之后保持在一个近似稳定的状态，直到游泳结束。混乱关系在水中23゚摄氏28゚逐渐减少,直到大约30分钟后开始游泳,然后,略微下降到游泳。在步行过程中，Tre逐渐增加，直到步行开始后60分钟，之后一直保持在一个近似稳定的状态，直到步行结束。在3种不同水温下，步行时的tre3明显高于游泳时的tre3。33ºC水中的平均皮肤温度（T^^-sk）在开始游泳后15分钟左右逐渐升高，之后一直保持在一个近似稳定的状态，直到游泳结束。23 C和28 C水的T^^-sk在游泳开始后迅速下降，之后分别保持在一个近似稳定的状态，直到游泳结束。2 .在房间行走过程中，T^^-sk逐渐升高，直到开始行走30分钟后，T^^-sk一直保持在一个近似稳定的状态，直到行走结束。23 C水和房间行走的吸氧量高于28 C和33 C水。在室内行走时的心率（HR）高于在三种不同温度的水中行走时的心率（HR）。3 . 23、33 C水的HR比28 C水的HR高。23 C水的血乳酸浓度高于28 C和33 C水。去甲肾上腺素浓度在23 C水和房间行走中高于28 C和33 C水。这些结果表明，当长时间游泳或其他低强度的水中运动时，相对温暖的水（高于28 C和低于33 C）可能是理想的。

This study was to examine the physiological responses to prolonged swimming at three different water temperatures and room walking in a temperate environment.The results are summarized as follows :1.Rectal temperature (Tre) in water of 33ﾟC increased gradually until 30 minutes after the start of swimming, and afterward, kept at an approximate steady state to the end of swimming. Tre in water of 23ﾟC and 28ﾟC decreased gradually until about 30 minutes after the start of swimming, and afterward, dropped slightly until the end of swimming. Tre during room walking increased gradually until 60 minutes after the start of walking, and afterward, kept at an approximate steady state to the end of walking. Tre during walking increased significantly compared with Tre in swimming at three different water temperature.2.Mean skin temperature (T^^-sk) in water 33ﾟC increased gradually until about 15 minutes after the start of swimming, and afterward, stayd at an approximate steady state to the end of swimming. T^^-sk in water of 23ﾟC and 28ﾟC dropped rapidly after the start of swimming, and afterward, stayd at an approximate steady state until the end of swimming, respectively. T^^-sk during room walking increased gradually until 30 minutes after the start of walking, and afterward, kept at an approximate steady state to the end of walking.3.Oxygen uptake in water of 23ﾟC and room walking were higher than in water of 28ﾟC and 33ﾟC.Heart rate (HR) in room walking was higher than in water of three different temperatures. HR in water of 23ﾟC and 33ﾟC increased in comparison with that in the 28ﾟC water.4.Blood lactate concentrations was higher in the 23ﾟC water than in water of 28ﾟC and 33ﾟC,and room walking. Noradrenaline concentrations was higher in the 23ﾟC water and room walking than in water of 28ﾟC and 33ﾟC.These results suggest that a relative warm water, above 28ﾟC and under 33ﾟC,may be desirable when prolonged swimming or other water exercise is performed at low intensity.