Related Experiment Videos
Changes in internal mechanical cost during overground running to exhaustion
Jean S Slawinski1, Veronique L Billat
1Department STAPS, UFR of Fundamental Applied Science University of Evry-Val d'Essonne, Building of Sciences, Evry, France. jeanslawinski@yahoo.fr
Medicine and Science in Sports and Exercise
|July 15, 2005
Summary
During exhaustive running, internal mechanical cost (C(int)) significantly increased, but not in correlation with the energy cost of running (C(r)). The reasons for this C(int) increase remain unclear.
Area of Science:
- Biomechanics
- Exercise Physiology
- Sports Science
Background:
- Understanding the energetic and mechanical costs of running is crucial for optimizing athletic performance.
- Investigating changes in mechanical cost during fatiguing exercise can reveal underlying physiological adaptations.
Purpose of the Study:
- To determine if internal mechanical cost changes during exhaustive overground running.
- To assess the relationship between changes in internal mechanical cost and the overall energy cost of running (C(r)).
Main Methods:
- 14 endurance runners performed an exhaustive supra-threshold run at 95% maximal oxygen uptake.
- Pulmonary gas exchange measured the energy cost of running (C(r)).
- 3D motion analysis quantified potential, kinetic, and internal mechanical costs (C(pe), C(ke), C(int)).
Main Results:
- Both internal mechanical cost (C(int)) and energy cost of running (C(r)) significantly increased during the exhaustive run.
- The percentage increase in C(int) did not correlate with the percentage increase in C(r).
- Kinetic (C(ke)) and potential (C(pe)) mechanical costs remained constant but correlated with C(r).
Conclusions:
- Overground running to exhaustion leads to a significant increase in internal mechanical cost (C(int)).
- This increase in C(int) does not explain the rise in the overall energy cost of running (C(r)).
- The physiological factors driving the increase in C(int) during fatigue require further investigation.