Sex Differences in Countermovement Jump Phase Characteristics

Area of Science:

• Biomechanics
• Human Movement Science
• Sports Science

Background:

• Countermovement jump (CMJ) is a key metric for assessing neuromuscular function and sex differences.
• Previous research often focused on gross CMJ measures, with limited analysis of specific jump phases.

Purpose of the Study:

• To investigate sex-based differences in countermovement jump (CMJ) phase characteristics.
• To compare force-, power-, velocity-, and displacement-time curves between male and female athletes throughout the entire CMJ.

Main Methods:

• Fourteen male and fourteen female athletes performed three CMJs on a force platform.
• Kinetic and kinematic variables were calculated using forward dynamics.
• Gross CMJ measures and detailed phase characteristics were analyzed.

Main Results:

• Men demonstrated significantly greater jump height (JH), relative peak concentric power, and impulse compared to women.
• Relative force-time curves were similar, but men showed higher relative power, velocity, and displacement during specific CMJ phases.
• Men achieved greater velocity throughout the concentric phase, including at take-off.

Conclusions:

• The countermovement jump effectively differentiates between male and female athletes' neuromuscular capabilities.
• Men's superior jump height is attributed to greater concentric impulse and sustained higher velocities during the propulsive phase.