Document Detail

Effect of work rate on cardiorespiratory response to rhythmic-static exercise.
MedLine Citation:
PMID:  7727799     Owner:  NLM     Status:  MEDLINE    
Influence of work rate (30 and 30 rpm) on exercise hyperpnoea, respiratory entrainment and cardiovascular system was studied in 9 healthy men performing rhythmic-static exercise (RSE). Respiratory frequency (f), tidal volume (VT), minute ventilation (VE), heart rate (HR), stroke volume (SV), and cardiac output (Q) were continuously measured. RSE was performed in upright position on a special motor-driven cycloergometer with an intensity of 40% VO2max for 5 min. The subjects opposed the flywheel movement by pressing the pedal alternately with left and right leg. It was found that in both work rates respiratory frequency followed the rhythm of exercise. The increases in f (28v35 breaths/min. p < 0.05) were associated with decreased VT (1.3v1.0L, p < 0.05) but they did not influence VE which was 33 and 36 1/min (NS). Accelerations of f and VE were faster for 30 than 60 rpm reaching respective values of 2.70v0.75 breaths/min/s (p < 0.05), and 0.59v0.31 1/min/s (p < 0.05). Cardiac response and its kinetics were found to be similar for both exercise rhythms. It is concluded that breathing entrainment does not affect either ventilation or the cardiac response during the RSE exercise. Since changes in acceleration of ventilation were not accompanied by appropriate changes in cardiac output acceleration the cardiodynamic hypothesis of exercise hyperpnoea does not seem to be valid for rhythmic-static exercise.
R Grucza; Y Miyamoto; Y Nakazono
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of physiology and pharmacology : an official journal of the Polish Physiological Society     Volume:  45     ISSN:  0867-5910     ISO Abbreviation:  J. Physiol. Pharmacol.     Publication Date:  1994 Dec 
Date Detail:
Created Date:  1995-06-01     Completed Date:  1995-06-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9114501     Medline TA:  J Physiol Pharmacol     Country:  POLAND    
Other Details:
Languages:  eng     Pagination:  573-81     Citation Subset:  IM; S    
Department of Applied Physiology, Polish Academy of Sciences, Warsaw.
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MeSH Terms
Cardiac Output / physiology
Exercise / physiology*
Heart Rate / physiology
Hemodynamics / physiology*
Oxygen Consumption / physiology
Respiratory Mechanics / physiology*
Stroke Volume / physiology
Tidal Volume / physiology

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