Key result
Accumulated 10-minute walking bouts reduce BP in prehypertensive men regardless of intensity.
Why the study?
Does accumulated physical activity at varying intensities reduce blood pressure in prehypertensive young male adults?
RCT (n=40)
Single-blind
Unbalanced randomization (3:1) using random number table
No
Does accumulated physical activity at varying intensities reduce blood pressure in prehypertensive young male adults?
p-value: p=<0.001
Accumulated physical activity in 10-minute sessions effectively reduces diastolic blood pressure in prehypertensive young men, though this does not appear to be mediated by autonomic modulation.
Supports recommending accumulated 10-min walking bouts for BP control in prehypertensive men; extends evidence on intensity-independent effects.
Context: Accumulated moderate physical activity (PA) for 30 min in a day is the only recommended treatment of prehypertension. Objective: We investigated autonomic modulation as a possible mechanism for the decrease in blood pressure (BP) during the rest periods in each 10 min session of PA. Design, Setting, and Participants: We conducted a single-blind randomized multi-arm control trial on 40 prehypertensive (pre-HT) young male adults. Methods: Participants were randomly divided by using random number table into four groups. Control (no intervention); Group 1 (walking at 50% of predicted VO2 peak); Group 2 (walking at 60% of predicted VO2 peak); Group 3 (walking at 70% of predicted VO2 peak). BP, heart rate variability (HRV), and heart rate recovery 1 min (HRR 1 min) were measured at baseline and during the rest period after each session of 10 min over 30 min of accumulated physical activity (PAcumm). Results: Significant diastolic BP (DBP) reduction (P < 0.001) was observed during the rest period after each session of PAcumm in intervention groups. An average reduction in DBP was more in pre-HT undertaking PAcumm at 70% of predicted VO2 Peak. Decrease in the mean value of low-frequency (LF) and LF/high-frequency ratio was observed following PAcumm in all intervention groups irrespective of the intensity of PA. No significant association of reduction of BP with HRV and HRR 1 s was observed. Conclusion: Reduction in BP was observed during the rest period after each 10 min session of PAcumm irrespective of the intensity of PA. Autonomic modulation does not seem to be the possible mechanism for the reduction in BP during the sessions.
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Saxena et al. (2016) conducted an RCT in Prehypertension (n=40). Accumulated physical activity (walking) vs. No intervention was evaluated on Diastolic blood pressure reduction during the rest period after each session (p=<0.001). Accumulated physical activity in 10-minute bouts significantly reduced systolic and diastolic blood pressure in prehypertensive men, irrespective of the walking intensity (P < 0.001).
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