Document Detail

Effect of push frequency on the economy of wheelchair racers.
MedLine Citation:
PMID:  10647546     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of the study was to examine the effect of varying push frequency on pushing economy (oxygen uptake at a given speed). METHODS: Eight male wheelchair racers completed a series of exercise bouts on a wheelchair ergometer (Bromking Turbo Trainer, Bromakin, UK) at 6.58 m x s(-1). Initially, subjects self-selected their freely chosen push frequency (FCF); this was followed by 4 random trials pushing at 60, 80, 120, and 140% of this FCF. Steady state VO2 was determined using Douglas bags, and heart rate was recorded by telemetry. After each condition, a small capillary blood sample was obtained and analyzed for blood lactate concentration (BLa) and a rating of perceived exertion (RPE) was recorded. RESULTS: At 6.58 m x s(-1) oxygen uptake, RPE, and gross mechanical efficiency were nonlinearly related to push frequency. Analysis of variance showed a significant effect (P < 0.05) of cycle frequency on VO2. VO2 was 11% higher at the 140% FCF compared with the 100% FCF condition. Changes in push frequency had little effect on HR although BLa increased linearly and was higher at the 140% FCF condition compared with 60% FCF (P < 0.05). A two-dimensional sagittal plane video analysis showed large interindividual differences in propulsion style. Both cycle time and the propulsion phase (%) decreased as the push frequency increased. The start angle and end angle of hand contact were similar for conditions, whereas the range of trunk motion decreased with push frequency (P < 0.05). CONCLUSION: The results of this study showed that the push frequency had an effect on pushing economy, and that the athletes' FCF was the most economical.
V L Goosey; I G Campbell; N E Fowler
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  32     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-02-10     Completed Date:  2000-02-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  174-81     Citation Subset:  IM; S    
Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, United Kingdom.
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MeSH Terms
Analysis of Variance
Exercise Test
Hand / physiology
Heart Rate / physiology
Lactic Acid / blood
Oxygen Consumption / physiology
Physical Exertion / physiology
Sports / physiology*
Thorax / physiology
Time Factors
Videotape Recording
Reg. No./Substance:
50-21-5/Lactic Acid

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

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