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Fatigue during a 5-km running time trial.

A T Nummela¹, K A Heath, L M Paavolainen

¹KIHU, Research Institute for Olympic Sports, Jyväskylä, Finland. ari.nummela@kihu.fi

International Journal of Sports Medicine

|January 24, 2008

Summary

Muscle fatigue during a 5-km run relates more to endurance performance and pacing, not maximal sprint ability. Sprint performance, however, is linked to fatigue measured during maximal efforts like the 20-m sprint.

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Area of Science:

Exercise Physiology
Sports Science
Biomechanics

Background:

Understanding fatigue mechanisms is crucial for optimizing endurance running performance.
Neuromuscular fatigue can significantly impact running economy and performance during prolonged exercise.

Purpose of the Study:

To investigate fatigue-induced changes in neuromuscular and stride characteristics during and after a 5-km running time trial.
To differentiate between fatigue measured during maximal efforts versus fatigue experienced during a 5-km time trial.

Main Methods:

Eighteen well-trained male distance runners participated.
Maximal 20-m sprint tests and maximal voluntary contraction (MVC) were performed pre- and post-5-km time trial.
Electromyography (EMG) of five lower limb muscles was measured during all tests.

Main Results:

Muscle fatigue from maximal exercises (20-m sprint, MVC) did not correlate with fatigue during the 5-km time trial.
Fatigue in the 20-m sprint test correlated with pretest sprint velocity.
Velocity loss during the 5-km time trial was inversely related to 5-km performance and training volume.

Conclusions:

Fatigue measured at maximal effort (pre/post 5-km) is more indicative of sprint than endurance performance.
Fatigue experienced during a 5-km run is linked to endurance capacity and pacing strategies.