Modelling the relationship between isokinetic muscle strength and sprint running performance

Area of Science:

• Sports Science
• Biomechanics
• Human Movement

Background:

• Muscle strength is a key factor in athletic performance.
• The link between muscle strength and sprint speed needs further investigation.
• Elite athletes' performance is influenced by complex biomechanical factors.

Purpose of the Study:

• To investigate the relationship between lower limb isokinetic muscle strength and sprint performance in elite athletes.
• To explore theoretical models explaining the strength-sprint performance connection.
• To identify specific muscle actions and speeds most predictive of sprint success.

Main Methods:

• Eight rugby players, eight sprinters, and eight general athletes performed 15 m and 35 m sprints.
• Isokinetic torque was measured at knee, hip, and ankle joints at various speeds (concentric and eccentric).
• Linear regression and allometric force models were used to analyze data.

Main Results:

• Concentric knee extension at high speed (4.19 rad s(-1)) showed the strongest correlation with sprint performance (0-15 m and 30-35 m times).
• Relative torque (to body mass) improved correlations for the initial 0-15 m sprint phase.
• An allometric force model explained 77% of the variance using sprint time, limb length, and body mass.

Conclusions:

• Isokinetic muscle strength, particularly concentric knee extension, is significantly related to sprint performance.
• Incorporating limb length and body mass into models enhances the prediction of acceleration (0-15 m sprint).
• These findings offer insights into optimizing training for sprint-based athletic performance.