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Effects of short-term training with uncoupled cranks in trained cyclists

Citation

Burns, JM and Peiffer, JJ and Abbiss, CR and Watson, G and Burnett, A and Laursen, PB, Effects of short-term training with uncoupled cranks in trained cyclists, International journal of sports physiology and performance, 7, (2) pp. 113-120. ISSN 1555-0265 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 Human Kinetics, Inc.

Official URL: http://journals.humankinetics.com/ijspp-back-issue...

DOI: doi:10.1123/ijspp.7.2.113

Abstract

PURPOSE: Manufacturers of uncoupled cycling cranks claim that their use will increase economy of motion and gross efficiency. Purportedly, this occurs by altering the muscle-recruitment patterns contributing to the resistive forces occurring during the recovery phase of the pedal stroke. Uncoupled cranks use an independent-clutch design by which each leg cycles independently of the other (ie, the cranks are not fixed together). However, research examining the efficacy of training with uncoupled cranks is equivocal. The purpose of this study was to determine the effect of short-term training with uncoupled cranks on the performance-related variables economy of motion, gross efficiency, maximal oxygen uptake (VO2max), and muscle-activation patterns. METHODS: Sixteen trained cyclists were matched-paired into either an uncoupled-crank or a normal-crank training group. Both groups performed 5 wk of training on their assigned cranks. Before and after training, participants completed a graded exercise test using normal cranks. Expired gases were collected to determine economy of motion, gross efficiency, and VO2max, while integrated electromyography (iEMG) was used to examine muscle-activation patterns of the vastus lateralis, biceps femoris, and gastrocnemius. RESULTS: No significant changes between groups were observed for economy of motion, gross efficiency, VO2max, or iEMG in the uncoupled- or normal-crank group. CONCLUSIONS: Five weeks of training with uncoupled cycling cranks had no effect on economy of motion, gross efficiency, muscle recruitment, or VO2max compared with training on normal cranks.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Health
Objective Group:Health and Support Services
Objective Field:Health and Support Services not elsewhere classified
Author:Watson, G (Dr Greig Watson)
ID Code:78785
Year Published:2012
Web of Science® Times Cited:1
Deposited By:Health Sciences A
Deposited On:2012-07-26
Last Modified:2013-03-07
Downloads:4 View Download Statistics

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