Research article summary (published 18 Sep 2006):

Cycling exercise and the determination of electromechanical delay.

Full Abstract

The main aim of the present paper was to address the validity of a methodology proposed in a previous paper [Li L, Baum BS. Electromechanical delay estimated by using electromyography during cycling at different pedaling frequencies. J Electromyogr Kinesiol 2004;14(6):647-52], aimed at determining the electromechanical delay from pedaling exercise performed at various cadences. Twelve trained subjects undertook pedaling bouts corresponding to combinations of cadences ranging from 50 to 100 RPM and power output from 37.5% to 75% of Pmax. As cadence increased, peak torque angle was found to shift forward in crank cycle (from 60-65 degrees at 50 RPM to 75-80 degrees at 100 RPM, depending on the power output level), while muscle bursts shifted backward in accordance with previous works. It is therefore suggested to take into account this peak torque angle lag to improve the methodology proposed by Li and Baum. The present results also evidenced that the central strategy, consisting in earlier muscle activation in crank cycle as cadence increases, is only partial. Neural strategy seems to be a trade-off between mechanical efficiency of muscular force output and coactivation.

Author information

Author/s: Sarre, G (G); Lepers, R (R);

Affiliation: INSERM ERM207, Université de Bourgogne, UFR STAPS, BP 27877, 21078 Dijon Cedex, France.

Journal and publication information

Publication Type: Journal Article

Journal: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology (J Electromyogr Kinesiol), published in England. (Language: eng)

Reference: 2007-Oct; vol 17 (issue 5) : pp 617-21

Dates: Created 2007/08/08; Completed 2007/12/06; Revised 2008/11/21;

PMID: 16990013, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult Bicycling - physiology Exercise Test Hip Joint - physiology Humans Knee Joint - physiology Male

Male Muscle Contraction - physiology Muscle, Skeletal - physiology Physical Exertion - physiology Task Performance and Analysis Time Factors Torque

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