title: Blood pressure reduction following accumulated physical activity in prehypertensive.
abstract: BACKGROUND
  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.
  
  
  METHODS
  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 VO2peak); Group 2 (walking at 60% of predicted VO2peak); Group 3 (walking at 70% of predicted VO2peak). 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 VO2Peak. 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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Physiology, HIMS, SRH University, Dehradun, Uttarakhand, India.
authors.forename: Yogesh
authors.initials: Y
authors.lastname: Saxena
authors.affiliation: Department of Physiology, HIMS, SRH University, Dehradun, Uttarakhand, India.
authors.forename: Rani
authors.initials: R
authors.lastname: Gupta
authors.affiliation: Department of Physiology, NIMS University, Jaipur, Rajasthan, India.
authors.forename: Arsalan
authors.initials: A
authors.lastname: Moinuddin
authors.affiliation: Department of PMR, BPS Government Medical College for Women, Sonipat, Haryana, India.
authors.forename: Ravinder
authors.initials: R
authors.lastname: Narwal
keywords: Accumulated physical activity; blood pressure; prehypertensive