Document Detail


Determinants of time to fatigue during nonmotorized treadmill exercise.
MedLine Citation:
PMID:  19387389     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Treadmill exercise is commonly used for aerobic and anaerobic conditioning. During nonmotorized treadmill exercise, the subject must provide the power necessary to drive the treadmill belt. The purpose of this study was to determine what factors affected the time to fatigue on a pair of nonmotorized treadmills. Twenty subjects (10 men/10 women) attempted to complete 5 minutes of locomotion during separate trials at 3.22, 4.83, 6.44, 8.05, 9.66, and 11.27 kmxh. Total exercise time (<or=5 minutes) was recorded. Exercise time was converted to the number of 15-second intervals completed. Peak oxygen uptake (Vo2) was measured using a graded exercise test on a standard treadmill, and anthropometric measures were collected from each subject before their entrance into the study. A Cox proportional hazards regression model was used to determine significant predictive factors in a multivariate analysis. Treadmill speed and absolute peak Vo2 were found to be significant predictors of exercise time, but there was no effect of anthropometric characteristics. Gender was found to be a predictor of treadmill time, but this was likely attributable to a higher peak Vo2 in men than in women. The results were not affected by the type of treadmill tested in this study. Coaches and therapists should consider the cardiovascular fitness of an athlete or client when prescribing target speed because these factors are related to the total exercise time that can be achieved on a nonmotorized treadmill.
Authors:
John K De Witt; Stuart M C Lee; Cassie A Wilson; R Donald Hagan
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  23     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-05-06     Completed Date:  2009-08-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  883-90     Citation Subset:  IM    
Affiliation:
Wyle's Life Sciences Group, Houston, Texas, USA. john.k.dewitt@nasa.gov
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MeSH Terms
Descriptor/Qualifier:
Anthropometry
Exercise Test / instrumentation*
Female
Humans
Male
Military Personnel
Muscle Fatigue / physiology*
Oxygen Consumption / physiology
Proportional Hazards Models
Time Factors

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


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