THE EFFECTS OF HYDRATION STATUS ON POST-EXERCISE HYPOTENSION
Cardiff Metropolitan University
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Introduction Exercise can help prevent and manage numerous chronic conditions including hypertension and hydration status influences the acute responses to exercise. A normal response to acute exercise is a prolonged decrease in blood pressure (BP), known as post-exercise hypotension (PEH). Objective To determine whether hydration status influences PEH. Method 9 healthy normotensives (4 female, 5 male) completed four exercise tests: a VÝ O 2max test; a 30 minute continuous exercise bout at 50% VÝ O 2max (control; C); and two interval exercise bouts (4 x (4 minutes at 85% VÝ O 2max, 3 minutes recovery at 50% VÝ O 2max)). Interval bouts were completed at different hydration states (I3 and I9; drank 3 and 9 mL·(kg of body mass)-1 of water, respectively). BP, heart rate, lactate, VÝ O 2 and plasma volume (PV) were measured before exercise sessions (baseline) through to 1 hour post-exercise. Statistical significance was determined using 2-way repeated-measures ANOVA. Results Mean heart rate was lowest in C throughout (P≤0.001) and similar between interval sessions (P=0.525). During exercise, mean systolic BP (SBP) was lowest in C (157 ± 23 mmHg; P≤0.001), similar in I3 (174 ± 18 mmHg) and I9 (168 ± 20 mmHg; P = 0.105), and at 12 minutes, there was a trend for 8 mmHg lower SBP in I3 (186 ± 17 mmHg) compared to I9 (178 ± 20 mmHg; P=0.070). iii SBP during recovery was 5 mmHg lower in I3 (104 ± 10 mmHg) than C (110 ± 11 mmHg; P=0.016), there was a trend for 3 mmHg lower SBP in I9 (107 ± 11 mmHg) compared to C (P=0.052) and no difference between interval sessions (P=0.854). PV (P=0.760) and postexercise diastolic BP (P=0.468) were similar between sessions. Conclusion Hydration status influences the acute responses to exercise; furthermore, our findings suggest that decreased hydration might increase SBP during exercise, however PEH is unaffected
DEGREE OF BACHELOR OF SCIENCE (HONOURS) INTERCALATED SPORT AND EXERCISE SCIENCE
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