Document Detail

Effect of pulmonary rehabilitation on quadriceps fatiguability during exercise.
MedLine Citation:
PMID:  11282768     Owner:  NLM     Status:  MEDLINE    
We have recently shown that patients with chronic obstructive pulmonary disease (COPD) develop contractile fatigue of their quadriceps muscle following endurance exercise. Pulmonary rehabilitation can produce physiological adaptations in patients with COPD. We hypothesized that if pulmonary rehabilitation induces physiological adaptations in the exercising muscle, it should become more fatigue resistant. Twenty one patients with COPD, mean age 69.9 +/- 1.9 yr, FEV(1) 45 +/- 4% predicted, participated in an 8-wk outpatient, supervised pulmonary rehabilitation exercise program. Quadriceps contractile fatigue was detected by a fall in quadriceps twitch force postexercise. Twitch force was measured during magnetic stimulation of the femoral nerve. Because potentiated twitches may be more sensitive at detecting fatigue, both unpotentiated (TwQu) and potentiated (TwQp) twitches were obtained before and 10, 30, and 60 min after constant load cycle exercise. Prerehabilitation, during constant load exercise, patients exercised at 37 +/- 4 W for 11.2 +/- 1.8 min. Prerehabilitation, TwQu fell significantly postexercise down to a minimum value of 82.5 +/- 3.1% of the baseline preexercise value (p < 0.001). Similarly, prerehabilitation, TwQp fell significantly postexercise down to a minimum value of 73.9 +/- 3.9% of baseline (p < 0.001). Postrehabilitation, for the same intensity and duration of exercise, TwQu was not significantly different from baseline at any time postexercise. Postrehabilitation, TwQp fell significantly postexercise but the fall in TwQp with exercise was significantly less postrehabilitation compared with prerehabilitation (p < 0.001). In conclusion, pulmonary rehabilitation resulted in increased fatigue resistance of the quadriceps muscle in patients with COPD.
M J Mador; T J Kufel; L A Pineda; A Steinwald; A Aggarwal; A M Upadhyay; M A Khan
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of respiratory and critical care medicine     Volume:  163     ISSN:  1073-449X     ISO Abbreviation:  Am. J. Respir. Crit. Care Med.     Publication Date:  2001 Mar 
Date Detail:
Created Date:  2001-04-03     Completed Date:  2001-05-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9421642     Medline TA:  Am J Respir Crit Care Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  930-5     Citation Subset:  AIM; IM    
Division of Pulmonary and Critical Care Medicine, State University of New York at Buffalo, 14215, USA.
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MeSH Terms
Analysis of Variance
Exercise Test*
Lung Diseases, Obstructive / diagnosis,  rehabilitation*
Muscle Fatigue / physiology*
Muscle, Skeletal / physiology
Reference Values
Respiratory Function Tests
Respiratory Therapy / methods*
Sensitivity and Specificity
Severity of Illness Index
Treatment Outcome

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

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