水中歩行時の心臓血管系応答および主観的運動強度に及ぼす水温の影響

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本研究は，水中歩行時における水温条件の違いが心臓血管系応答および主観的運動強度に及ばす影響を検討するために，25，30，35℃にそれぞれ設定された水温条件下で60分間，水中歩行運動の実験を行った。酸素摂取量は，歩行開始から終了時まで各水温間に有意差は認められなかった。心拍数は，歩行開始10分後から歩行終了まで35＞25＞30℃の順に高かった。血圧は，収縮期および拡張期血圧ともに25＞30＞35℃の順に高い傾向を示した。ダブルプロダクトは，水温25＞35＞30℃の順に値が高かった。主観的運動強度は，歩行開始10分後を除き，運動中全てにおいて25＞30＞35℃の順に高かった。本研究結果から，25℃以下の水温での水中歩行は心臓血管系機機能に大きな負担を招く可能性があることが示唆された。また本実験では，熟ストレスを高進しない温度帯（30℃）より高温（35℃）の方が，主観的運動強度が低下した。このことから中強度，長時間の水中歩行運動時での水温条件において，心臓血管系応答と主観的疲労感覚とは必ずしも一致しないことが示唆された。The purpose of the present study was to compare cardiovascular responses and perceived exertion on three different temperatures. Eight healthy men were the subjects in this experiment, and they were in average 19.0±0.7 in age, 168.2 ±3.7cms in height, 60.8±4.6kgs in weight, and 11.1±2.5% in percentage of body fat. After 30 min. rest on land, the subjects walked on the water treadmill, "Flowmill" (made by Japan Aquatec Co., Ltd.), for 60 minutes with water level set at xiphisternum for each subject under water temperature at 25, 30, and 35℃. All subjects were tested under the burden of 50% of V^^.O_2max, which was calculated from the treadmill walking on land. The results of the heart rate showed: Heart rate increased rapidly about 50-60 beats per minutes from the start till 10 minutes of exercise under all water temperatures; after then, it was kept stable. During heart rate became stable, it was constantly higher at 35 < 25 < 30℃. In comparison of different water temperatures, statistically significant difference were detected between 30℃ and 35℃ during 30 minutes till the end of exercise. The results of the oxygen intake showed: Oxygen intake under all water temperatures, it rapidly increased at 100 ml/min from the start till 10 minutes of exercise; after then it was kept stable. In comparison of different water temperatures, statistically significant differences were detected between 25℃ and 35℃ and between 25℃ and 30℃ at the start of exercise. There was no significant differences during exercise.

水中歩行時の心臓血管系応答および主観的運動強度に及ぼす水温の影響

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