Relative strength explains the differences in multi-joint rapid force production between sexes

Area of Science:

• Sports Science
• Biomechanics
• Human Movement

Background:

• Sex-based differences in strength and power are often observed in athletes.
• Understanding the factors contributing to rapid force production is crucial for optimizing athletic performance.

Purpose of the Study:

• To investigate if relative strength accounts for sex-based disparities in rapid force production.
• To examine the relationship between peak force and rapid force development in team sport athletes.

Main Methods:

• Sixty-three team sport athletes (25 females, 38 males) participated.
• Isometric mid-thigh pull (IMTP) tests were conducted to measure force production.
• Strength-matched pairs were created based on relative peak force to compare sexes.

Main Results:

• No significant differences in rapid force production (at 150, 200, 250 ms) were found between strength-matched males and females.
• Peak force demonstrated very large to near-perfect correlations (r=0.77-0.94) with rapid force production.
• Peak force explained a substantial portion of the variance in rapid force production (59%-89% across time points).

Conclusions:

• Relative strength, rather than sex alone, is a key determinant of rapid force production.
• Peak force is a critical factor influencing an athlete's ability to generate force rapidly.
• Coaches and practitioners should consider relative strength and peak force when assessing and training athletes.