Document Detail

Correlation between inflection of heart rate/work performance curve and myocardial function in exhausting cycle ergometer exercise.
MedLine Citation:
PMID:  8299609     Owner:  NLM     Status:  MEDLINE    
The heart rate/work performance (fc/W) curve is usually S-shaped but a flattening at the top is not always seen. By means of radionuclide ventricular scintigraphy, the left ventricular ejection fraction (LVEF) of 15 sports students was investigated. The behaviour of the fc/W curve during cycle ergometry with increasing exercise intensities was examined. During exercise, the LVEF showed a distinct initial increase reaching roughly constant values at stress levels below-maximum, and sometimes even falling again. The inflections of the fc/W curve and left ventricular ejection fraction/performance curve (LVEFPC) were calculated from a second degree polynomial fit. From this function, the slopes of the tangents at the points of aerobic threshold and maximum performance were calculated together with the differences of the angles as a measure of the fc/W curve and LVEFPC inflections. It follows that the fc/W curve inflection became less pronounced or was even absent altogether when the decrease in LVEF towards the end of the ergometer exercise became more distinct. A significant negative correlation was found between the existence and extent of the fc/W curve inflection and the stress-dependent myocardial function, expressed as the inflection of the LVEFPC (P < 0.01, r = 0.673). Thus, it would seem that the absence of a fc/W curve inflection was related to a diminished stress-dependent myocardial function.
R Pokan; P Hofmann; K Preidler; H Leitner; J Dusleag; B Eber; G Schwaberger; G F Füger; W Klein
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  67     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1993  
Date Detail:
Created Date:  1994-03-10     Completed Date:  1994-03-10     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:  385-8     Citation Subset:  IM    
Department of Internal Medicine, Karl Franzens University, Graz, Austria.
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MeSH Terms
Exercise Test
Heart / physiology*
Heart Rate / physiology*
Heart Ventricles / radionuclide imaging
Linear Models
Physical Exertion / physiology*
Time Factors
Ventricular Function, Left / physiology

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