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Quantifying the familiarization period for maximal resistive exercise.

Lara A Green¹, Justin J Parro, David A Gabriel

¹Electromyographic Kinesiology Laboratory, Faculty of Applied Health Sciences, Brock University, St. Catharines, ON L2S 3A1, Canada.

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|February 21, 2014

Summary

This summary is machine-generated.

Familiarization with maximal isometric dorsiflexion contractions stabilizes performance within 10 trials. This stability in force and agonist muscle activity is maintained over three days, indicating readiness for testing.

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Area of Science:

Biomechanics
Exercise Physiology
Neuromuscular Function

Background:

Resistive exercise is crucial for assessing musculoskeletal health and performance.
Standardized testing requires understanding the familiarization needed to stabilize performance metrics.
Previous research has not clearly defined the familiarization period for isometric dorsiflexion.

Purpose of the Study:

To determine the number of maximal isometric dorsiflexion contractions required for performance stabilization.
To assess the retention of familiarization effects over a three-day period.
To examine changes in force and muscle activity (sEMG) during familiarization and retention.

Main Methods:

Fifteen males performed familiarization with isometric dorsiflexion contractions (3 blocks of 5).
Mean force and surface electromyography (sEMG) of agonist and antagonist muscles were recorded.
Variance ratios assessed trial-to-trial stability for force and sEMG.

Main Results:

Force and agonist sEMG stability (variance ratio) was achieved within the first 10 contractions.
Antagonist sEMG stability improved during a retention test 3 days later.
Mean force increased by 11% during retention, with stable agonist and antagonist sEMG.

Conclusions:

Familiarization for maximal isometric dorsiflexion is achieved within 10 contractions.
Performance stabilization is retained over a three-day interval.
Slight increases in force may occur post-familiarization without changes in muscle activation.