Abstract
Context:Isokinetic strength and functional performance are used to assess recovery after rehabilitation. It is not known whether low-speed closed-linear-kinetic isokinetic muscle strength correlates with functional performance.Objective:To investigate the relationship between linear closed (CKC) and open (OKC) concentric isokinetic strength of the dominant lower-limb extensors and functional performance.Design:Correlational analysis.Setting:University laboratory.Participants:Thirty uninjured men and women (age = 20.9 ± 2.4 years).Main Outcome Measures:Peak CKC and OKC isokinetic strength and best score from a shuttle run for time, single-leg vertical jump, and single-leg hop for distance.Results:Neither lower-limb CKC nor OKC isokinetic strength measured at low speeds correlated highly with performance on the functional tasks of jumping, hopping, and speed/agility.Conclusions:Although the basis of both closed and open isokinetic strength must be appreciated, they should not be the only determinants of functional performance.
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