June 5, 2015Clinical Physiology and Functional Imaging
The influence of water ingestion on postexercise hypotension and standing haemodynamics
Key result
Ingesting 500 ml of water before exercise elicited an overall increase in blood pressure compared to 50 ml (P<0.05), but did not affect the magnitude of postexercise hypotension.
Why the study?
Does ingestion of 500 ml of water before exercise decrease the magnitude of postexercise hypotension and improve standing haemodynamics in healthy adults?
Population
17 healthy adults (nine men; eight women, 21.2 ± 1.6 years)
Comparison
Ingestion of 500 ml of water before completing… vs Ingestion of 50 ml of water before completing…
Design
RCT, In a randomized fashion
Follow-up
Immediate recovery period including 5 min of active standing
Authors
Discussion
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Implication
Alerts clinicians to pre-exercise BP elevation risk; hypothesis-generating and should not yet change practice.
Study Design
Type
RCT (n=17)
Randomization
randomized
Structured PICO
Does ingestion of 500 ml of water before exercise decrease the magnitude of postexercise hypotension and improve standing haemodynamics in healthy adults?
P
Population
17 healthy young adults (mean age 21.2 years, 47% female) who completed resting, cycle ergometer, and recovery protocols on two separate days.
I
Intervention
Ingestion of 500 ml of water before completing resting, cycle ergometer and recovery protocols
C
Comparator
Ingestion of 50 ml of water before completing resting, cycle ergometer and recovery protocols
O
Outcome
Magnitude of postexercise hypotension (PEH) and haemodynamic reaction (arterial blood pressure, heart rate, and spectral heart rate variability) to 5 min of active standing postmaximal exercisesurrogate
Main Result
p-value: p=<0.05
Ingesting 500 ml of water before maximal exercise increases overall blood pressure but does not affect the magnitude of postexercise hypotension or standing haemodynamics.
Cite This Study
Mendonça et al. (2015) conducted an RCT in Healthy adults (n=17). Water ingestion vs. 50 ml of water was evaluated on Magnitude of postexercise hypotension (PEH) and blood pressure (p=<0.05). Ingesting 500 ml of water before exercise elicited an overall increase in blood pressure compared to 50 ml (P<0.05), but did not affect the magnitude of postexercise hypotension.