The effect of fluid intake during exercise on post-exercise hypotension.
Cardiff Metropolitan University
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Many cardiovascular conditions can be treated and management by lifestyle changes including participation in exercise. Hypertension is one such condition, which general practitioners and other health care professionals encourage patients to increase the weekly amount of exercise they undertake. An acute decrease a blood pressure after the cessation of exercise, known as post-exercise hypotension, has been attributed to the reduction of an individuals resting blood pressure. Hydration during exercise has also been identified has having an effect on a person’s cardiovascular system (including blood pressure) during exercise. This study will aim to investigate the effect of fluid intake during exercise on post-exercise hypotension. Nine (male = 5, female =4) young healthy individuals attending three laboratory sessions; a VO 2 max test and two thirty minute high intensity interval sessions (HIIT) (4 x 4 minutes at 85% VO2 max interspersed 3 minutes recovery at 50% VO 2 max). Each HIIT was conducted with a different hydration status; mild dehydration (3 mL per kg body mass -1) and euhydration (9 mL per kg body mass -1). Hart rate and VO2 were measured throughout both exercise and recovery; blood pressure was measured every ten minutes during the sixty minute recovery period. Mean systolic blood pressure in HS1 and HS2 during recovery was not significantly different (P=0.614), however after HS2 blood pressure at the end of recovery was not significantly different from baseline compared to HS1 were blood pressure was significantly lower than the baseline measurement (P<0.05). There was no significant difference between the two hydration statuses in diastolic blood pressure (P= 0.535) and heart rate (P=0.492) during recovery. Heart rate under both conditions significantly reduce from on interval to the next during recovery (all P<0.05). In conclusion, fluid intake during exercise does not appear to have an effect of postexercise hypotension.
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