title: Acute effect of oral water intake during exercise on post-exercise hypotension.
abstract: OBJECTIVE
  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.
  
  
  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 (ΔPV) was also measured.
  
  
  RESULTS
  Body weight loss during exercise was 0.65 ± 0.24 kg in the control. ΔPV 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.
authors.affiliation: Department of Exercise Science and Physiology, School of Health and Nutritional Sciences, Prefectural University of Hiroshima, Hiroshima, Japan.
authors.forename: M Y
authors.initials: MY
authors.lastname: Endo
authors.forename: C
authors.initials: C
authors.lastname: Kajimoto
authors.forename: M
authors.initials: M
authors.lastname: Yamada
authors.forename: A
authors.initials: A
authors.lastname: Miura
authors.forename: N
authors.initials: N
authors.lastname: Hayashi
authors.forename: S
authors.initials: S
authors.lastname: Koga
authors.forename: Y
authors.initials: Y
authors.lastname: Fukuba
mesh_terms: D000328:Adult; D062186:Arterial Pressure / Q000187:drug effects*; D001642:Bicycling / Q000502:physiology*; D001916:Brachial Artery / Q000187:drug effects; D003681:Dehydration / Q000503:physiopathology / Q000517:prevention & control*; D004326:Drinking; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D057774:Post-Exercise Hypotension / Q000503:physiopathology / Q000517:prevention & control*; D012039:Regional Blood Flow / Q000502:physiology; D012146:Rest / Q000502:physiology; D014661:Vasoconstriction / Q000187:drug effects; D014867:Water / Q000494:pharmacology* / Q000502:physiology; D015431:Weight Loss; D055815:Young Adult
chemical_list: D014867:Water