Document Detail

Kinetics of cardiorespiratory response to dynamic and rhythmic-static exercise in men.
MedLine Citation:
PMID:  2282906     Owner:  NLM     Status:  MEDLINE    
Kinetics of cardiorespiratory response to dynamic (DE) and then to rhythmic-static exercise (RSE) was compared in nine male subjects exercising in an upright position on a cycle ergometer at an intensity of about 50% VO2max and a mean pedalling frequency of 60 rpm over 5 min. Respiratory frequency (fR), tidal volume (VT), minute ventilation (VE), heart rate (fc), stroke volume (SV), and cardiac output (Qt) were measured continuously. The RSE caused a greater increase in fR than DE, whereas VT increased more during DE. The effect of reciprocal changes in fR and VT was that VE and its kinetics, expressed as a time constant (tau), did not differ between experimental situations. The ventilatory equivalent for O2 (VE: VO2) was greater for RSE (31.3) than for DE (23.0, P less than 0.01). Elevation of fc was similar for both types of exercise. The SV increased suddenly at the beginning of DE from 54 ml to 74 ml and then decreased to the end of exercise. At the onset of RSE only a moderate increase in SV was observed, from 56 ml to 62 ml, and then SV remained stable. The DE caused a greater and faster increase in Qt (4.20 l.min-1, for tau equal to 16.1 s) than RSE (3.25 l.min-1, for tau equal to 57.0 s, P less than 0.05 and P less than 0.002, respectively). Total peripheral resistance was almost 40% greater for RSE than for DE. No relationship was found between Qt and VE at the first 15 s of both types of exercise.(ABSTRACT TRUNCATED AT 250 WORDS)
R Grucza; Y Miyamoto; Y Nakazono
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  61     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1990  
Date Detail:
Created Date:  1991-03-15     Completed Date:  1991-03-15     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  230-6     Citation Subset:  IM; S    
Department of Applied Physiology, Polish Academy of Sciences, Warsaw.
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MeSH Terms
Blood Pressure
Cardiac Output
Cardiovascular Physiological Phenomena*
Exercise / physiology*
Heart Rate
Oxygen Consumption
Respiration / physiology*
Stroke Volume
Tidal Volume

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