Document Detail


Effect of work rate on cardiorespiratory response to rhythmic-static exercise.
MedLine Citation:
PMID:  7727799     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
R Grucza; Y Miyamoto; Y Nakazono
Related Documents :
2463559 - Relationship between heart rate and minute ventilation, tidal volume and respiratory ra...
10515399 - Noninvasive measurement of respiratory muscle performance after exhaustive endurance ex...
12385739 - Hyperventilation with he-o2 breathing is not decreased by superimposed external resista...
18996229 - Lateral parabrachial nucleus mediates shortening of expiration and increase of inspirat...
1185679 - Mean and breath-by-breath pattern of breathing in man during steady-state exercise.
9517599 - Low load inspiratory muscle training increases diaphragmatic fiber dimensions in rats.
21183409 - Effects of emotional excitement on heart rate and blood pressure dynamics in patients w...
9153969 - Exercise performance after ptmc in mitral stenosis: the relation with hemodynamics, ven...
16446179 - Mobility and perceived function after total knee arthroplasty.
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    
Affiliation:
Department of Applied Physiology, Polish Academy of Sciences, Warsaw.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Cardiac Output / physiology
Ergometry
Exercise / physiology*
Heart Rate / physiology
Hemodynamics / physiology*
Humans
Male
Oxygen Consumption / physiology
Respiratory Mechanics / physiology*
Stroke Volume / physiology
Tidal Volume / physiology

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


Previous Document:  Forms of physiological aliasing within the heart rate fluctuations by higher frequent respiratory mo...
Next Document:  Effect of compound 48/80 on the thalamic mast cells, serotonin level and corticosterone secretion in...