Relationship between Closed-Linear-Kinetic-and Open-Kinetic-Chain Isokinetic Strength and Lower Extremity Functional Performance

in Journal of Sport Rehabilitation
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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.

Kovaleski and Pearsall are with the Dept of Orthopaedic Surgery, and Heitman, Andrew, and Gurchiek, with the Dept of Health and Physical Education, at the Univ of South Alabama, Mobile, AL 36688.