Gender differences in three-dimensional pelvic behavior during maximal sprint running.

Area of Science:

• Biomechanics
• Sports Science
• Human Movement

Background:

• Previous research on sprinting kinetics in females focused on lower limbs.
• Hypothesized greater lumbosacral lateral flexion torque and lower torsional torque in female sprinters.
• Limited understanding of sex-based differences in 3D pelvic behavior and kinetics during maximal sprinting.

Purpose of the Study:

• To compare stiffness parameters, 3D pelvic behavior, and kinetics between female and male sprinters.
• To investigate sex-based differences in lumbosacral joint torques during maximal sprinting.
• To elucidate the biomechanical factors contributing to differences in sprinting performance.

Main Methods:

• Utilized 3D motion capture and force platforms to collect data from eight female and eight male sprinters.
• Recorded kinematics and kinetics during 60-m sprints from a crouching start.
• Calculated stiffness parameters, 3D pelvic motion, and joint kinetics.

Main Results:

• Female sprinters demonstrated significantly lower vertical stiffness than male sprinters.
• Females exhibited greater pelvic lateral flexion toward the free leg side and associated angular impulse.
• Females had significantly lower step frequency and reduced free leg side rotational impulse.

Conclusions:

• Increased pelvic lateral flexion in females may aid in upward center of mass movement.
• Lower lumbosacral torsional torque in females could delay leg recovery, leading to reduced step frequency.
• These findings highlight distinct biomechanical strategies employed by female sprinters.