Document Detail


Heart rate variability and exercise in aging women.
MedLine Citation:
PMID:  21967166     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Our group has shown a positive dose-response in maximal cardiorespiratory exercise capacity (VO(2max)) and heart rate variability (HRV) to 6 months of exercise training but no improvement in VO(2max) for women ≥60 years. Here, we examine the HRV response to exercise training in postmenopausal women younger and older than 60 years.
METHODS: We examined 365 sedentary, overweight, hypertensive, postmenopausal women randomly assigned to sedentary control or exercise groups exercising at 50% (4 kcal/kg/week, [KKW]), 100% (8 KKW) and 150% (12 KKW) of the National Institutes of Health (NIH) Consensus Development Panel physical activity guidelines. Primary outcomes included time and frequency domain indices of HRV.
RESULTS: Overall, our analysis demonstrated a significant improvement in parasympathetic tone (rMSSD and high frequency power) for both age strata at 8 KKW and 12 KKW. For rMSSD, the age-stratified responses were: control, <60 years, 0.20 ms, 95% confidence interval (CI)-2.40, 2.81; ≥60 years, 0.07 ms, 95% CI -3.64, 3.79; 4 KKW, <60 years, 3.67 ms, 95% CI 1.55, 5.79; ≥60 years, 1.20 ms, 95% CI -1.82, 4.22; 8-KKW, <60 years, 3.61 ms, 95% CI 0.88, 6.34; ≥60 years, 5.75 ms, 95% CI 1.89, 9.61; and 12-KKW, <60 years, 5.07 ms, 95% CI 2.53, 7.60; ≥60 years, 4.28 ms, 95% CI 0.42, 8.14.
CONCLUSIONS: VO(2max) and HRV are independent risk factors for cardiovascular disease (CVD) mortality. Despite no improvement in VO(2max), parasympathetic indices of HRV increased in women ≥60 years. This is clinically important, as HRV has important CVD risk and neurovisceral implications beyond cardiorespiratory function.
Authors:
Conrad P Earnest; Steven N Blair; Timothy S Church
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-10-03
Journal Detail:
Title:  Journal of women's health (2002)     Volume:  21     ISSN:  1931-843X     ISO Abbreviation:  J Womens Health (Larchmt)     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-03-08     Completed Date:  2012-10-01     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  101159262     Medline TA:  J Womens Health (Larchmt)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  334-9     Citation Subset:  IM    
Affiliation:
Pennington Biomedical Research Center, Preventive Medicine and Exercise Biology, Louisiana State University System, Baton Rouge, Louisiana 70808, USA. conrad.earnest@pbrc.edu
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MeSH Terms
Descriptor/Qualifier:
Aged
Aging / physiology*
Female
Heart Rate / physiology*
Humans
Grant Support
ID/Acronym/Agency:
HL66262/HL/NHLBI NIH HHS
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