Abstract Summary
Quadriceps muscular strength weakness is commonly observed in individuals following ACL injury (ACLI). However, it is inconclusive whether force steadiness is worse in ACLI individuals. Twenty-four subjects with ACLI (54.9 days prior to testing) and 25 control subjects (CONTROL) completed the maximal voluntary isometric contractions (MVIC) for knee flexion and extension; then, they were asked to hold 10%, 25%, 35%, and 50% MVIC values (visible in monitor) as steady as they could for 10s. Average force and standard deviation in the middle 8s was used to calculate coefficient of variation (CoV). Few CoV differences were found. CoV at Hamstrings 25% (Ham25) and Quadriceps 35% (Quad35) were larger in the ACLI group than the CONTROL group.
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