Article

Time of day (TOD) for exercise may influence blood pressure ( BP) reduction in hypertension because of the diurnal variation of BP and the duration of BP reduction following a single bout of exercise. The purpose of this study was to observe the effects of TOD for exercise on ambulatory blood pressure reduction in dipping ( n = 5) and nondipping ( n = 9) hypertension ( <10% drop in nighttime BP (BPnight)). Hypotheses: ( 1) evening exercise (PMex) would exhibit a greater BPnight reduction in Non-Dippers than Dippers, ( 2) morning exercise (AM(ex)) would exhibit similar daytime BP (BPday) reduction in Dippers and Non-Dippers, ( 3) AM(ex) would exhibit greater 24 h BP (BP24 h) reduction than PMex in Dippers, and ( 4) AM(ex) and PMex would exhibit similar BP24 h reduction in NonDippers. BP responses to AM(ex) (0600 - 0800 h; 30 min at 50% VO2peak) and PMex ( 1700 - 1900 h) were compared to each control day in a randomized design. Systolic ( S) and diastolic (D) BP were averaged for BP24 h, BPday, and BP(nigh)t. A two-way ANOVA (dipping X time of exercise) using BP reduction with repeated measures were performed at P<0.05. Findings: ( 1) Non-Dippers respond to exercise despite of TOD for exercise, (2) PMex exhibited a greater SBPnight reduction in Non-Dippers than Dippers, ( 3) AM(ex) exhibited similar SBPday reductions in Dippers and Non-Dippers, and (4) AM(ex) and PMex exhibited similar SBP24 h reduction in Dippers and Non-Dippers. Dippers and Non-Dippers respond differently to TOD for exercise. The duration of the BP reduction persists up to 24 h after exercise.

Langue : ANGLAIS

Tiré à part : OUI