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    
Abstract/OtherAbstract:
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.
Authors:
R Pokan; P Hofmann; K Preidler; H Leitner; J Dusleag; B Eber; G Schwaberger; G F Füger; W Klein
Related Documents :
3308089 - Haemodynamics at rest and during isometric exercise under long-term treatment with capt...
6843909 - Antibodies in cerebrospinal fluid to white matter glycoproteins in multiple sclerosis p...
1535589 - Effects of amiodarone on erect and supine exercise haemodynamics and exercise capacity ...
6683069 - Resting and exercise left ventricular function in patients with hypertrophic cardiomyop...
2379969 - Fluid transport in peritoneal dialysis.
8491999 - Global and regional parameters of left ventricular performance in healthy subjects duri...
22755279 - Prognostic value of normal exercise tc-99m sestamibi myocardial perfusion imaging in ka...
913359 - Electrocardiographic abnormalities in hypothyroidism before and after exercise.
23029959 - Effect of short duration aerobic exercise training on reflection index, stiffness index...
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    
Affiliation:
Department of Internal Medicine, Karl Franzens University, Graz, Austria.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Exercise Test
Heart / physiology*
Heart Rate / physiology*
Heart Ventricles / radionuclide imaging
Humans
Linear Models
Physical Exertion / physiology*
Time Factors
Ventricular Function, Left / physiology

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


Previous Document:  Responses to whole body and finger cooling before and after an Antarctic expedition.
Next Document:  Myo-electric fatigue and force failure from submaximal static elbow flexion sustained to exhaustion.