Document Detail


A Kinematic Comparison of Alterations to Knee and Ankle Angles from Resting Measures to Active Pedaling During a Graded Exercise Protocol.
MedLine Citation:
PMID:  22158094     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Saddle height is one of the most researched areas of bike fit. The current accepted method for adjusting saddle height involves use of a goniometer to adjust saddle height so that a knee angle between 25° and 35° is obtained. This measurement is taken while the cyclist maintains a static position with the pedal at the six o'clock position. However, the act of pedaling is dynamic and angles may alter during movement. The purpose of this study was to examine alterations to knee and ankle angle occurringfrom static measures to active pedaling across intensities experienced by cyclists during a graded exercise protocol. Thirty-four recreational to highly trained cyclist were evaluated using 2D analysis of stationary position and three active levels (Level one, RER of 1.00, and max). Dependent measures were compared using repeated measures ANOVA (p = 0.05). When examining the results it is evident that significant alterations to pedal stroke occur from stationary measures to active pedaling and as intensity increases towards maximal. Plantar flexion increased when moving from stationary measures to active pedaling, which resulted in an increase in knee angle. While still greater than stationary measures, less plantar flexion occurred at higher intensities when compared to lower intensity cycling. Less plantar flexion at higher intensities is most likely a result of application of a larger downward torque occurring due to greater power requirements at higher intensities. There appeared to be greater variability in angle when examining novice cyclists in relation to more experienced cyclists. While stationary measures are where a bike fit session will begin, observation during the pedal cycle may be needed in order to fine tune the riders fit.
Authors:
Willard W Peveler; Brandy Shew; Samantha Johnson; Thomas G Palmer
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-08
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Northern Kentucky University1; University of Kentucky2.
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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