Document Detail

Sex differences in linear and nonlinear heart rate variability during early recovery from supramaximal exercise.
MedLine Citation:
PMID:  20725109     Owner:  NLM     Status:  MEDLINE    
Women demonstrate greater RR interval variability than men of similar age. Enhanced parasympathetic input into cardiac regulation appears to be not only greater in women, but also protective during periods of cardiac stress. Even though women may have a more favorable autonomic profile after exercise, little research has been conducted on this issue. This study was designed to examine the cardiac autonomic response, in both male and female participants, during the early recovery from supramaximal exercise. Twenty-five individuals, aged 20 to 33 years (13 males and 12 females), performed a 30-s Wingate test. Beat-to-beat RR series were recorded before and 5 min after exercise, with the participants in the supine position and under paced breathing. Linear (spectral analysis) and nonlinear analyses (detrended fluctuation analysis (DFA)) were performed on the same RR series. At rest, women presented lower raw low frequency (LF) power and higher normalized high frequency (HF) power. Under these conditions, the LF/HF ratio of women was also lower than that of men (p<0.05), but there were no differences in the short-term scaling exponent (α1). Even though both sexes showed a significant modification in linear and nonlinear measures of heart rate variability (HRV) (p<0.05), women had a greater change in LF/HF ratio and α1 than men from rest to recovery. This study demonstrates that the cardiac autonomic function of women is more affected by supramaximal exercise than that of men. Additionally, DFA did not provide additional information about sexual dimorphisms, compared with conventional spectral HRV techniques.
Goncalo V Mendonca; Kevin S Heffernan; Lindy Rossow; Myriam Guerra; Fernando D Pereira; Bo Fernhall
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme     Volume:  35     ISSN:  1715-5312     ISO Abbreviation:  Appl Physiol Nutr Metab     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-20     Completed Date:  2010-10-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101264333     Medline TA:  Appl Physiol Nutr Metab     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  439-46     Citation Subset:  IM    
Department of Human Kinetics, Faculty of Human Kinetics, Technical University of Lisbon, Lisbon 1495-688, Portugal.
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MeSH Terms
Autonomic Nervous System / physiology*
Heart / innervation*
Heart Rate*
Linear Models*
Nonlinear Dynamics*
Recovery of Function
Sex Factors
Signal Processing, Computer-Assisted*
Time Factors
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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