Background: Isokinetic is widely used for assessment of muscle performance and yields a wide range of variables. The correlation between isokinetic variables and functional performance needs to be investigated.
Purpose: To investigate the relationship between isokinetic measures of knee extensors and flexors and measures of one leg hop functional performance test in healthy subjects.
Methods: Thirty male subjects performed an isokinetic test at 60°/s and 180°/s and the four functional hop tests (single hop, timed hop, triple hop, and cross over hop). The isokinetic variables; peak torque, total work, and average power of knee extensors and flexors were correlated with the output of functional hop test.
Results: Correlation between knee extensors and flexors isokinetic variables and single hop, triple hop and cross-over hop were weak to moderate significant correlation; with knee extensors average power at 180°/s showed highest correlation with cross over hop (r = 0.69. p = 0.0001). There was no significant correlation between the three isokinetic variables and timed hop test for knee extensors and flexors at both velocities. Total work and peak torque showed similar weak to moderate correlations with functional performance tests.
Conclusion: Low to moderate positive significant correlation exists between isokinetic peak, torque, total work, average power and hop functional performance test. The Higher correlation was between average power of knee extensors at 180°/s and cross over hop test. Average power is more correlated with functional performance than peak torque and total work and should be considered in the evaluation of muscle performance.
Key words: Isokinetic, Power, Functional performance, Hop test
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