Document Detail

Early development of EMG localized muscle fatigue in hand muscles of patients with chronic heart failure.
MedLine Citation:
PMID:  9440416     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Patients with chronic heart failure (CHF) frequently complain of fatigue and exercise intolerance that are not directly related to the severity of cardiac failure. A not well-defined muscle function impairment is generally considered the cause of such symptoms. The frequency compression of electromyographic (EMG) signal power spectrum during isometric contractions is commonly accepted as an index of the fatigue occurring in the muscle (localized muscle fatigue). PURPOSE AND METHODS: The purpose of the study was to evaluate muscle fatigue development in a selected group of CHF patients by studying the compression of the EMG signal power spectrum. The first dorsal interosseus of the right, dominant hand was investigated at two levels of contraction: 40% and 80% of the maximal voluntary contraction (MVC). RESULTS: In CHF patients there was early development of localized muscle fatigue during the high level of contraction (80% of MVC). CONCLUSION: This study demonstrates the presence of an early development of localized muscle fatigue in CHF patients and confirms the possibility of an increased glycolytic metabolism. Moreover, the changes seem to show that muscle impairment is not limited to large muscles, but also occurs in small muscles of the hands, frequently used during daily activities. Finally, this study confirms the validity of EMG spectral analysis techniques in evaluating muscle fatigue of CHF patients, suggesting a possible use in the rehabilitation of such patients when the technique is correctly used.
M Buonocore; C Opasich; R Casale
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  79     ISSN:  0003-9993     ISO Abbreviation:  Arch Phys Med Rehabil     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-02-05     Completed Date:  1998-02-05     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  41-5     Citation Subset:  AIM; IM; S    
Department of Clinical Neurophysiology, Consiglio Nazionale Della Richerche, Salvatore Maugeri Foundation, IRCCS, Rehabilitation Institute of Montescano, Italy.
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MeSH Terms
Case-Control Studies
Chronic Disease
Exercise Tolerance*
Hand Strength*
Heart Failure / complications*
Isometric Contraction
Middle Aged
Muscle Fibers, Fast-Twitch / pathology
Muscle Weakness / diagnosis*,  etiology*,  metabolism,  physiopathology
Signal Processing, Computer-Assisted
Time Factors

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

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