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Sports science methods for detecting athlete asymmetry, including isokinetic tests, jump tests, and tensiomyography (TMG), are not interrelated. Interestingly, higher asymmetry correlated with better jump performance, challenging its role in injury prevention.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Athlete asymmetry is studied for injury prevention and performance enhancement.
  • Various methods like isokinetic assessments, jump tests, and tensiomyography (TMG) are used to identify asymmetries.
  • The relationship between these methods and their impact on functional performance requires clarification.

Purpose of the Study:

  • To investigate the interrelationship between asymmetries detected by isokinetic assessments, jump tests, and TMG.
  • To determine if functional indices derived from these asymmetry measures correlate with jumping ability.
  • To evaluate the diagnostic utility of these methods for functional screening in athletes.

Main Methods:

  • Collected data on TMG parameters, unilateral/bilateral jump performances (squat-jump and countermovement-jump), and peak torque from isokinetic knee extension/flexion at 60°/s and 300°/s in 24 soccer players.
  • Calculated asymmetry as the percentage difference between dominant and non-dominant legs.
  • Utilized the median-split technique to categorize athletes into best and worst performers for jump tests.

Main Results:

  • No interrelationship was found between asymmetries detected by TMG, isokinetic tests, and unilateral jumps.
  • Higher levels of asymmetry were paradoxically associated with better squat-jump and countermovement-jump performances.
  • Only knee-extension peak torque demonstrated moderate to large correlations (r=0.48-0.66) with jump performance across both angular velocities.

Conclusions:

  • The lack of intercorrelation among TMG, isokinetic tests, and unilateral jumps limits their use as a singular functional screening tool.
  • Lower-limb asymmetry in soccer players is not necessarily indicative of impaired vertical jump performance.
  • Further research is needed to understand the complex relationship between asymmetry, different assessment methods, and athletic performance.