Document Detail

Changes in spring-mass model parameters and energy cost during track running to exhaustion.
MedLine Citation:
PMID:  18438219     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine whether exhaustion modifies the stiffness characteristics, as defined in the spring-mass model, during track running. We also investigated whether stiffer runners are also the most economical. Nine well-trained runners performed an exhaustive exercise over 2000 meters on an indoor track. This exhaustive exercise was preceded by a warm-up and was followed by an active recovery. Throughout all the exercises, the energy cost of running (Cr) was measured. Vertical and leg stiffness was measured with a force plate (Kvert and Kleg, respectively) integrated into the track. The results show that Cr increases significantly after the 2000-meter run (0.192 +/- 0.006 to 0.217 +/- 0.013 mL x kg(-1) x m(-1)). However, Kvert and Kleg remained constant (32.52 +/- 6.42 to 32.59 +/- 5.48 and 11.12 +/- 2.76 to 11.14 +/- 2.48 kN.m, respectively). An inverse correlation was observed between Cr and Kleg, but only during the 2000-meter exercise (r = -0.67; P < or = 0.05). During the warm-up or the recovery, Cr and Kleg, were not correlated (r = 0.354; P = 0.82 and r = 0.21; P = 0.59, respectively). On track, exhaustion induced by a 2000-meter run has no effect on Kleg or Kvert. The inverse correlation was only observed between Cr and Kleg during the 2000-meter run and not before or after the exercise, suggesting that the stiffness of the runner may be not associated with the Cr.
Jean Slawinski; Richard Heubert; Jacques Quievre; Véronique Billat; Christine Hanon; Christine Hannon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  22     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-06-06     Completed Date:  2008-08-07     Revised Date:  2009-02-10    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  930-6     Citation Subset:  IM    
Laboratory of Biomechanics and Physiology, National Institute of Sports (INSEP), Paris, France.
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MeSH Terms
Anaerobic Threshold
Analysis of Variance
Energy Metabolism / physiology*
Exercise Test / methods
Exercise Tolerance
Models, Biological*
Muscle Fatigue / physiology*
Muscle Strength / physiology
Physical Exertion*
Range of Motion, Articular / physiology
Risk Factors
Running / physiology*
Track and Field / physiology*
Erratum In:
J Strength Cond Res. 2008 Sep;22(5):1720
Note: Hannon, Christine [corrected to Hanon, Christine]

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

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