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Effects of isometric handgrip training on blood pressure (resting and 24 h ambulatory) and heart rate variability in medicated hypertensive patients.
MedLine Citation:
PMID:  22322195     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: Isometric handgrip (IHG) training (four, 2-min sustained contractions at 30% of maximal voluntary contraction, three times per week for 8-10 weeks) lowers resting arterial blood pressure (BP) in hypertensive patients, including those receiving pharmacotherapy, although the mechanisms remain elusive. Ambulatory BP measurements are more efficacious in predicting cardiovascular disease-related events, yet the effects of IHG training on ambulatory BP are unknown. The objective of the current investigation was to test the hypotheses that 8 weeks of IHG training lowers resting and 24 h ambulatory BP concomitantly in medicated hypertensive patients, and may be the result of improved vagal modulation. METHODS: BP was assessed using brachial artery oscillometry, and coarse-graining spectral analysis was used to determine spectral power. Resting and 24 h ambulatory BP and heart rate variability (HRV) were measured pretraining, midtraining, and post-training in 11 medicated hypertensive patients (mean±SD, resting BP: 113.9±12.7/60.7±11.6 mmHg), and in nine medicated hypertensive controls (resting BP: 117.8±14.3/67.5±4.2 mmHg). RESULTS: Indices of BP and HRV were not significantly altered with IHG training (all P>0.05). CONCLUSION: IHG training does not lower resting or ambulatory BP in hypertensive patients successfully treated with pharmacotherapy to within the normal range (≤120/80 mmHg), nor does it improve HRV. Future studies should examine alternative IHG training protocols in well-managed hypertensive patients and/or target poorly controlled medicated hypertensive patients.
Authors:
Cassandra Stiller-Moldovan; Kenji Kenno; Cheri L McGowan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-9
Journal Detail:
Title:  Blood pressure monitoring     Volume:  -     ISSN:  1473-5725     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9606438     Medline TA:  Blood Press Monit     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Kinesiology, University of Windsor, Windsor, Ontario, Canada.
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