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| The effects of high-intensity versus low-intensity resistance training on leg extensor power and recovery of knee function after ACL-reconstruction |
| Bieler T, Aue Sobol N, Andersen LL, Kiel P, Lofholm P, Aagaard P, Magnusson SP, Krogsgaard MR, Beyer N |
| BioMed Research International 2014;(278512):Epub |
| clinical trial |
| 6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed* |
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OBJECTIVE: Persistent weakness is a common problem after anterior cruciate ligament- (ACL-) reconstruction. This study investigated the effects of high-intensity (HRT) versus low-intensity (LRT) resistance training on leg extensor power and recovery of knee function after ACL-reconstruction. METHODS: 31 males and 19 females were randomized to HRT (n = 24) or LRT (n = 26) from week 8 to 20 after ACL-reconstruction. Leg extensor power, joint laxity, and self-reported knee function were measured before and 7, 14, and 20 weeks after surgery. Hop tests were assessed before and after 20 weeks. RESULTS: Power in the injured leg was 90% (95% CI 86 to 94%) of the noninjured leg, decreasing to 64% (95% CI 60 to 69%) 7 weeks after surgery. During the resistance training phase there was a significant group by time interaction for power (p = 0.020). Power was regained more with HRT compared to LRT at week 14 (84% versus 73% of noninjured leg, respectively; p = 0.027) and at week 20 (98% versus 83% of noninjured leg, respectively; p = 0.006) without adverse effects on joint laxity. No other between-group differences were found. CONCLUSION: High-intensity resistance training during rehabilitation after ACL-reconstruction can improve muscle power without adverse effects on joint laxity.
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