Acute effect of oral water intake during exercise on post-exercise hypotension

Abstract

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.

Water Intake Accelerates Parasympathetic Reactivation After High-Intensity Exercise

“…However, in a recent study, Endo et al (2012) showed that WI during exercise can prevent hypotension in the postexercise period. It seems likely, therefore, that the greater parasympathetic reactivation after WI may be a compensatory response to a raised blood pressure at this time.…”

Influence of population and exercise protocol characteristics on hemodynamic determinants of post-aerobic exercise hypotension

“…PAEH has been demonstrated as clinically relevant because it is significant in magnitude and is sustained for a prolonged period after exercise (3). Moreover, it has been reported in different populations, including individuals who are hypertensive (4-9), prehypertensive (10,11), and normotensive (5,12-30). …”

“…Some of them attribute PAEH to reduced cardiac output (CO) (6,9,12,15,19,21-24,30-34), while others report a peripheral vascular resistance (PVR) reduction (4,7,16-18,20-23,25-29,33-53). This controversy suggests that some other factors could influence these determinants.…”

Efeito da ingestão hídrica sobre a recuperação cardiovascular pós-exercício

“…On the other hand, there is a lack of studies investigating the influence of water intake on the postexercise pressure response. In a literature review, we found only one study conducted by Endo et al 8 that evaluated the effect of water intake on BP during the recovery period. The authors observed that ad libitum water intake during exercise prevented the reduction in postexercise SBP and DBP.…”

“…However, studies have shown that water intake promotes an increase in BP through sympathetic activation 7 , a response that may inhibit PEH. In this respect, Endo et al 8 investigated the effects of water intake on postexercise BP responses and observed the absence of PEH. However, the subjects were submitted to exercise of moderate intensity.…”