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海水による温浴時の体温変動および心拍応答

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概要 The purpose of the present study was to compare the thermal responses of the body between bathing in warm sea water and fresh water, and also to further examine how the chemical components in sea wate...r affect the thermal responses of the body when bathing in warm sea water. The thermal responses were based on an examination of the rectal, skin and mean body temperatures at 0, 10 and 20 minutes of bathing as well as at l0, 20, 30 and 40 minutes in post-bathing recovery on land. Six healthy men were the subjects of this experiment, and they were on average 33.3±2.6 in age, 168.8±6.3cm in body height, 69.6±11.9kg in body weight, and had a body fat ratio of 16.3±4.5% on average. The subjects bathed in sea water and fresh water for 20 minutes and thereafter recovery on land for 40 minutes, respectively. The experiment was conducted under water at a temperature of 38.5℃ during the bathing. In all subjects, the rectal temperature increased during bathing and thereafter decreased gradually during recovery on land. Bathing in sea water showed significant increases in the rectal temperature at 20 minutes during bathing and at 10 minutes during recovery on land. The mean skin temperature showed a continuous increase during bathing and a rapid decrease during the first 10 minutes of recovery on land, followed by a gradual decrease thereafter. No significant differences were observed in the mean skin temperature between sea water and fresh water. The mean body temperature also showed a continuous increase during bathing and a rapid decrease during the first 10 minutes of recovery on land, and a gradual decrease thereafter. The mean body temperature in sea water showed significant increase compared with that in freash water during the examined time from the first 10 minutes after bathing to 40 minutes after recovery on land. From the above results it was proven that the thermal responses of the body were higher when bathing in sea water than when bathing in fresh water. This was indicated as a result of the tunicate effect of the chemical components of sea water. Moreover, the amount of sweating judged from body weight loss indicated that bathing in warm sea water also demonstrated a tendency to control hydromeiosis.
本研究は,海水に含まれる成分が温水浴時の体温調節反応に及ぼす影響を検討することを主たる目的とした。被験者は健康な成人男性6名であり,その平均の年齢,身長,体重および体脂肪率はそれぞれ33.3±2.6歳,168.8±6.3cm,69.6±11.9kgおよび16.3±4.5%であった。実験は,水温38.5℃に設定された海水および淡水の条件下で20分問の入浴後,40分間の回復期とした。直腸温は,入浴直後から一過性に上昇傾向を示し,出浴時にはゆるやかな下降現象を示した。入浴20分および出浴10分において海水条件の方が淡水より有意に上昇した。平均皮膚温は,入浴直後から一過性に上昇傾向を示し,出浴10分以内に急速に下降傾向を示した。その後はゆるやかな低下を示したが,海水と淡水の問に有意差は認められなかった。平均体温は,入浴直後から一過性に上昇傾向を,また出浴直後には急速に下降傾向を示し,その後はゆるやかな低下を示した。入浴10分から出浴40分まで海水条件の方が淡水より有意に高かった。以上のように,体温反応に関して,海水条件の方が淡水条件より上昇傾向にあったことは,海水の含有成分による被膜効果を示唆する結果となった。また,実験前後の体重差から発汗量を推定した場合,海水による温浴は,淡水より発汗減少を抑制する傾向にあることが推察された。
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登録日 2009.09.10
更新日 2018.06.12