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Effects of Short-term Training with Uncoupled Cranks in Trained Cyclists.
MedLine Citation:
PMID:  22174105     Owner:  NLM     Status:  Publisher    
PURPOSE: Manufacturers of uncoupled cycling cranks claim that their use will increase economy of motion and gross efficiency. Purportedly, this occurs by altering the muscular 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 (i.e. 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 (VO2 max) and muscle activation patterns. METHODS: Sixteen trained cyclists were matched-paired into either an Uncoupled cranks or Normal cranks training group. Both groups performed 5 wk training on their assigned cranks. Prior to and following training, participants completed a graded exercise test (GXT) using normal cranks. Expired gases were collected to determine economy of motion, gross efficiency and VO2 max, while integrated electromyography (iEMG) was used to examine muscular activation patterns of vastus lateralis, biceps femoris and gastrocnemius. RESULTS: No significant changes between groups were observed for economy of motion, gross efficiency, VO2 max or iEMG in either the Uncoupled or Normal cranks group. CONCLUSIONS: Five weeks of training with uncoupled cycling cranks had no effect on economy of motion, gross efficiency, muscle recruitment or VO2 max compared with training on normal cranks.
Jack M Burns; Jeremiah J Peiffer; Chris R Abbiss; Greig Watson; Angus Burnett; Paul B Laursen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-29
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-12-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia.
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