| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4077579 | The Knee | 2013 | 5 Pages |
BackgroundThere 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.MethodsThirty 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.ResultsA 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).ConclusionOKC knee extensor exercise at high loads and low loads causes an immediate increase in knee laxity that begins to decrease within 90 min.
