Document Detail


Effects of exercise load and breathing frequency on heart rate and blood pressure variability during dynamic exercise.
MedLine Citation:
PMID:  10376479     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It is known that heart rate (HR) variability decreases with dynamic exercise, but there are only few studies on blood pressure (BP) variability with exercise loads and the effect of breathing pattern has never been investigated. Thus, we studied HR and systolic blood pressure (SBP) signals by spectral analysis (FFT), in 9 healthy subjects, at different breathing frequencies (0.15, 0.2, 0.3, 0.4, 0.5, 0.6 Hz), at rest and during 3 exercise loads (25, 50 and 75% VO2max). BP was measured with a non-invasive device (Finapres) and continuously recorded. The power spectrum of R-R period significantly decreased with exercise loads in the low frequency band (LF: 0.04-0.128 Hz) and in the high frequency band (HF: 0.128-0.65 Hz), but with breathing frequency only in the HF part of the spectrum. The power spectrum of SBP significantly increased with exercise loads in LF and HF bands, and decreased in HF band with increasing breathing frequency. R-R and SBP HF peaks were centered on breathing frequency peaks. Therefore, spectral analysis of HR and SBP confirm the withdrawal of vagal control during exercise, while mechanical effect of respiration on SBP persists. LF/HF ratio of R-R spectral components decreased with increasing load, whereas cardiovascular sympathetic activity is known to rise, suggesting that this ratio is not a good indicator of cardiovascular autonomic modulation during exercise.
Authors:
F Cottin; Y Papelier; P Escourrou
Related Documents :
7264239 - Age-related changes of cardiac control function in man. with special reference to heart...
6994699 - Multifactorial evaluation of hemofiltration therapy in comparison with conventional hem...
8490949 - Early and late effects of exercise and athletic training on neural mechanisms controlli...
16541379 - Heart rate variability and performance at two different altitudes in well-trained swimm...
10874279 - Effect of exercise training on heart rate variability in patients with new-onset left v...
8777829 - Respiratory sinus arrhythmia and central respiratory drive in humans.
20826629 - Nonprescribed physical activity energy expenditure is maintained with structured exerci...
8045849 - Effect of hypoxia and hyperoxia on human +gz duration tolerance.
16825419 - Time-frequency coherence analysis of phrenic and hypoglossal activity in the decerebrat...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sports medicine     Volume:  20     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1999 May 
Date Detail:
Created Date:  1999-08-30     Completed Date:  1999-08-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  232-8     Citation Subset:  IM; S    
Affiliation:
Laboratoire de physiologie, Faculté de médecine, Kremlin-Bicêtre, Hôpital Antoine Béclère, Clamart, France. cottin@critt-ccst.fr
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Blood Pressure / physiology*
Cardiovascular Physiological Phenomena
Exercise / physiology*
Heart Rate / physiology*
Humans
Male
Respiration
Sympathetic Nervous System / physiology

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


Previous Document:  Pre-exercise ingestion of carbohydrate and transient hypoglycemia during exercise.
Next Document:  Physiological effects of variations in spontaneously chosen crank rate during sub-maximal and supra-...