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Post‐exercise hypotension: The effect of water drinking during exercise
Author(s) -
Fukuba Yoshiyuki,
Kajimoto Chie,
Yamada Masako,
Koga Shunsaku,
Endo Masako Y
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.24.1_supplement.804.3
Subject(s) - supine position , heart rate , medicine , dehydration , mean arterial pressure , blood pressure , cycle ergometer , physical exercise , anesthesia , cardiology , physical therapy , chemistry , biochemistry
There is commonly a sustained reduction in mean arterial blood pressure (MAP) after a prolonged exercise, even in normotensive individuals, i.e., post‐exercise hypotension (PEH). Since the lowered pre‐load is supposed to be one of the potential causes of PEH, due to the decreased plasma volume (PV) via dehydration during exercise, we aimed to explore the effect of water drinking to PEH. Nine male subjects undertook 60‐min leg cycle ergometer exercise at work rate of 60 % of heart rate (HR) reserve without (C protocol) or with (W protocol) oral water intake, followed by 30‐min of supine rest. Subjects remained at supine rest for a further 60‐min. In the W protocol, the subjects were able to drink the water with an ad‐lib manner (~600 ml) during exercise to adjust the exercise‐induced reduction of body weight. The HR, MAP, and relative change (Δ) of PV were measured throughout the protocol. The MAP in C protocol was substantially reduced during recovery (~5 mmHg; p<0.05), compared to pre‐exercise level. In contrast, MAP in W protocol did not show the substantial reduction during recovery, and was significantly higher to those in C protocol. The ΔPV was not different during recovery between both protocols. These results indicate that PEH seems unlikely to be association to the factor related to the PV change, while oral water intake per se has an unsolved influence to post‐exercise MAP. (Support: JSPS‐KAKENHI, 20700526, 21370111)