BACKGROUND/OBJECTIVES: Post-exercise hypotension (PEH) is a sustained reduction in mean arterial blood pressure (MAP) after prolonged exercise. As water drinking is known to elicit a large acute pressor response, we aimed to explore the effect of drinking water during exercise on PEH. SUBJECTS/METHODS: Ten normotensive male volunteers performed the control protocol: 30 min supine rest, 60 min cycling exercise in moderate intensity, and 60 min supine rest recovery. In the water drinking protocol, the same procedure was followed but with water intake during exercise to compensate for exercise-induced body weight lost. Heart rate, MAP, cardiac output and blood flow in the brachial artery were measured pre-and post-exercise. The total vascular conductance (TVC) and the vascular conductance (VC) in the brachial artery were calculated pre-and post-exercise, and the relative change in plasma volume (DPV) was also measured. RESULTS: Body weight loss during exercise was 0.65±0.24 kg in the control. DPV was not different during recovery in either protocol. MAP in the control was significantly reduced during the latter half of the recovery compared with baseline. In contrast, MAP in the water drinking showed no reduction during recovery, and was significantly higher than in the control. TVC and VC in the brachial artery were lower in the water drinking, in which vasoconstriction was relatively exaggerated. CONCLUSIONS: Prevention of dehydration after exercise by oral water intake, or oral water intake per se has a role in maintaining post-exercise MAP and it may be related to reduction in TVC.
The carotid baroreflex (CBR) control of central and peripheral hemodynamics was investigated after exercise in both the presence and absence of postexercise hypotension (PEH). In individuals with no PEH, the responsiveness of CBR-mediated changes in all hemodynamics was augmented after exercise, particularly to high blood pressure; conversely, the CBR responsiveness remained unchanged in individuals with PEH. These findings provide insight into the mechanism of CBR control after exercise.
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)
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