Effect of Hydration States on Thermoregulatory Responses during Exercise in Rats.
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- KAWABATA Takashi
- Department of Physiology, Kyoto Prefectural University of Medicine
書誌事項
- タイトル別名
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- Effect of Hydration States on Thermoreg
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抄録
Thermoregulatory response during exercise was studied in rats with three hydration states: euhydration, hypohydration (−18% plasma volume by thermal dehydration), and hyperhydration (+24% plasma volume by 5% bovine serum albumin solution infusion). Rats exercised (12.5 m·min-1) for 30 min at an ambient temperature of 25°C. Abdominal temperature (Tab) and heart rate were continuously recorded by using a surgically implanted transmitter and telemetry system, and the tail skin temperature (Tts) was measured as an index of peripheral vasomotor tone. In the euhydration group, Tts showed an increase when Tab reached 37.6°C; an increase of Tts was observed at 37.9°C of Tab in the hypohydration group and at 37.4°C in the hyperhydration group. The slope of the Tts-Tab relationship was steeper in the hyperhydration group and less steep in the hypohydration group than in the euhydration group. These results indicate that hypohydration leads to an upward shift in the body temperature threshold for tail vasodilation and an increase in Tab during exercise. Hyperhydration, however, leads to a downward shift of the threshold and the maintenance of a lower Tab. An elevation of the threshold Tab for vasodilation was observed when plasma volume was reduced by more than 20%, and a decrease was observed when plasma volume increased more than 15%.
収録刊行物
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- The Japanese Journal of Physiology
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The Japanese Journal of Physiology 48 (1), 57-62, 1998
一般社団法人 日本生理学会
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詳細情報 詳細情報について
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- CRID
- 1390001205041522304
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- NII論文ID
- 130004435657
- 30015529514
- 10008304031
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- NII書誌ID
- AA00691224
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- COI
- 1:STN:280:DyaK1c3gslSqsQ%3D%3D
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- ISSN
- 18811396
- 0021521X
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- NDL書誌ID
- 4450311
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- PubMed
- 9538290
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可