Document Detail


Blood pressure responses to acute and chronic exercise are related in prehypertension.
MedLine Citation:
PMID:  22899388     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
PURPOSE: Aerobic exercise is recommended as a way to prevent hypertension. However, about 25% of individuals receive minimal antihypertensive benefits associated with chronic exercise training. Thus, we attempt to identify those "nonresponders" to chronic exercise on the basis of their blood pressure (BP) responses to acute exercise (single session). Our primary objective was to correlate the magnitude of BP decrease after acute exercise to the magnitude of BP reduction after chronic exercise. Our secondary objective was to examine the correlates of BP reduction after acute and chronic exercise.
METHODS: Seventeen prehypertensive (120 to 139/80 to 89 mm Hg) males and females (45-60 yr old) underwent acute exercise assessments before an 8-wk walking/jogging program (four times per week, 30 min per session, 65% maximum oxygen consumption). BP, hemodynamics, HR variability, and baroreflex sensitivity were assessed before and after acute exercise and chronic training.
RESULTS: BP was significantly reduced -7.2 ± 1.2/-4.2 ± 1.0 and -7.0 ± 1.4/-5.2 ± 1.2 mm Hg relative to baseline after acute (30 min at 65% maximum oxygen consumption) and chronic exercise, respectively (P < 0.01). The magnitude of change in systolic BP after acute exercise was strongly correlated with change in resting systolic BP after chronic training, r = 0.89, P < 0.01. A similar correlation was observed with diastolic BP, r = 0.75, P < 0.01. After acute exercise, significant reductions in total power (ms) and baroreflex sensitivity were observed in both sexes (P < 0.01). However, after chronic exercise, only men demonstrated a significant reduction in the low-frequency-to-high-frequency ratio (-36%), P < 0.01.
CONCLUSIONS: The magnitude of the acute BP-lowering with exercise may predict the extent of BP lowering after chronic training interventions in prehypertensive individuals.
Authors:
Sam Liu; Jack Goodman; Robert Nolan; Shawn Lacombe; Scott G Thomas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  44     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-08-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1644-52     Citation Subset:  IM; S    
Affiliation:
1Graduate Department of Exercise Sciences, Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, Ontario, CANADA; and 2Behavioral Cardiology Research Unit, University Health Network, Toronto, Ontario, CANADA.
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