The immediate effects of open kinetic chain knee extensor exercise at different loads on knee anterior laxity in the uninjured

Andrew Nicholettos, Massimo G. Barcellona, Matthew C. Morrissey*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Background: There is evidence that anterior laxity may be affected by knee extensor open kinetic chain (OKC) exercise with responses being load-dependent. The aim of this study is to evaluate the immediate and short-term changes in passive knee anterior laxity following a single session of OKC knee extensor exercise. Methods: Thirty two participants were randomly allocated to perform either high load (20 sets of 2 repetitions) or low load (2 sets of 20 repetitions) knee extensor OKC exercise with knee anterior laxity assessed before exercise, immediately after exercise and 45 and 90. min after exercise with a KT-2000 arthrometer using a 133. N force. Results: A significant effect of time was observed on knee laxity (p < 0.001). However, a significant interaction of time and group was not found (p = 0.54) and so the results presented here are for the combined (low and high load) group mean ± standard deviation knee anterior laxity (mm) in the exercised leg: 7.2 ± 2.2 (baseline), 8.2 ± 2.3 (immediate post exercise, 14% change from baseline), 8.1 ± 2.3 (45. min post exercise, 12% change from baseline), and 7.7 ± 2.2/0.29 (6.9) (90. min post exercise, 7% change from baseline). Conclusion: OKC knee extensor exercise at high loads and low loads causes an immediate increase in knee laxity that begins to decrease within 90. min.

    Original languageEnglish
    Pages (from-to)500-504
    Number of pages5
    JournalKnee
    Volume20
    Issue number6
    DOIs
    Publication statusPublished - 1 Dec 2013

    Keywords

    • Anterior cruciate ligament
    • Open kinetic chain
    • Resistance exercise

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