Document Detail


Estimation of critical power with nonlinear and linear models.
MedLine Citation:
PMID:  8531615     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sixteen young, healthy males each performed five to seven randomly assigned, exhaustive exercise bouts on a cycle ergometer, with each bout on a separate day and at a different power, to compare estimates of critical power (PC) and anaerobic work capacity (W') among five different models: t = W'/(Pmax-PC) (two-parameter nonlinear); t = (W'/P-PC))-(W'/(Pmax-PC)) (three-parameter nonlinear); P.t = W' + (PC.t) (linear (P.t)); P = (W'/t) + PC (linear (P)); P = PC + (Pmax-PC)exp(-t/tau) (exponential). The data fit each of the models well (mean R2 = 0.96 through 1.00 for each model). However, significant differences among models were observed for both PC (mean +/- standard deviation (SD) for each model was 195 +/- 29 W through 242 +/- 21 W) and W' (18 +/- 5 kJ through 58 +/- 19 kJ). PC estimates among models were significantly correlated (r = 0.78 through 0.99). For W', between-model correlations ranged from 0.25 to 0.95. For a group of six subjects, the ventilatory threshold for long-term exercise (LTE Tvent; 189 +/- 34 W) was significantly lower than PC for all models except the three-parameter nonlinear (PC = 197 +/- 30 W); PC for each model was, however, positively correlated with LTE Tvent (r = 0.69 through 0.91).(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
G A Gaesser; T J Carnevale; A Garfinkel; D O Walter; C J Womack
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  27     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1995 Oct 
Date Detail:
Created Date:  1996-01-30     Completed Date:  1996-01-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1430-8     Citation Subset:  IM; S    
Affiliation:
Department of Human Services, University of Virginia, Charlottesville 22903, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Algorithms
Anaerobic Threshold
Bicycling / physiology*
Exercise Test
Fatigue / physiopathology
Humans
Linear Models
Male
Models, Biological*
Models, Statistical*
Oxygen Consumption
Physical Endurance*
Pulmonary Gas Exchange
Respiration
Work Capacity Evaluation

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


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