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Factors affecting force loss with prolonged stretching.

D G Behm¹, D C Button, J C Butt

¹School of Physical Education, Recreation, and Athletics, Memorial University of Newfoundland, St. John's, Newfoundland A1C 5S7, Canada.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee

|July 7, 2001

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Prolonged static stretching causes a 12% decrease in maximal voluntary contraction force due to muscle inactivation, not changes in muscle elasticity. This impacts athletic performance and recovery.

Area of Science:

Exercise Physiology
Biomechanics
Muscle Physiology

Background:

Static stretching is common in athletic training.
Understanding its effects on muscle force production is crucial for optimizing performance and preventing injury.

Purpose of the Study:

To investigate the factors contributing to force loss after prolonged static stretching.
To differentiate between neural and mechanical contributions to post-stretch force deficits.

Main Methods:

Isometric maximal voluntary contraction (MVC) force measurement.
Electromyography (iEMG) for muscle activation assessment.
Interpolated twitch technique (ITT) to measure muscle inactivation.
Evoked contractile properties (twitch and tetanic force) analysis.

Related Experiment Videos

Main Results:

A significant 12% decrement in MVC force was observed post-stretching.
Muscle inactivation increased by 2.8% (ITT) and 20.2% (iEMG).
Twitch force decreased by 11.7%, but tetanic force remained unchanged.

Conclusions:

Post-stretch force loss is primarily attributed to increased muscle inactivation.
While muscle compliance may influence twitch force, it does not explain the reduction in maximal force.
Findings suggest neural factors are more dominant than mechanical changes in causing force deficits after static stretching.