Objective

To compare the effects of conventional (constant load) eccentric training and isokinetic eccentric training on quadriceps muscle mass, strength and functional performance in recreational athletes following anterior cruciate ligament (ACL) reconstruction.

Methods

Thirty recreational male athletes (25 years old) undergoing ACL reconstruction received a standard rehabilitation program. Volunteers were randomized to conventional group (CG; n = 15) or isokinetic group (IG; n = 15) to be engaged in a 6-week (2 sessions/week) quadriceps eccentric training program at the extensor chair or at the isokinetic dynamometer, respectively. Assessments of quadriceps muscle mass (through magnetic resonance imaging), strength (through isokinetic dynamometry) and self-aware functionality (through questionnaire) were performed before and after the training programs. Single leg hop test performance was assessed only at post-training evaluation.

Results

IG had significantly higher improvements than CG (p < 0.05) for all muscle mass outcomes (+17–23% vs. +5–9%), as well as for isometric (+34% vs. +20%) and eccentric (+85% vs. +23%) peak torques. There was no between-group difference (p > 0.05) for concentric peak torque, Lysholm score, and single leg hop test.

Conclusion

Isokinetic eccentric training promotes greater responses than conventional eccentric training on quadriceps muscle mass and strength of recreational athletes following ACL reconstruction.

中文翻译：

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对于前交叉韧带重建后的股四头肌康复，等速偏心训练比恒负荷偏心训练更有效：一项随机对照试验。

目的

为了比较常规（恒定负荷）离心训练和等速离心训练对前交叉韧带（ACL）重建后休闲运动员股四头肌肌肉质量，力量和功能表现的影响。

方法

进行ACL重建的30名娱乐性男运动员（25岁）接受了标准的康复计划。将志愿者随机分为常规组（CG； n = 15）或等速运动组（IG； n = 15），在伸肌椅或等速测功机上进行为期6周（2次/周）的股四头肌偏心训练计划， 分别。在训练计划之前和之后，对股四头肌肌肉质量（通过磁共振成像），力量（通过等速测功）和自我意识功能（通过问卷）进行评估。仅在训练后评估中评估单腿跳测试性能。

结果

IG在所有肌肉质量结局（+ 17–23％对+ 5–9％），等距（+ 34％对+ 20％）和偏心（ + 85％与+ 23％的峰值扭矩）。同心峰值扭矩，Lysholm评分和单腿跳试验没有组间差异（p> 0.05）。

结论

在进行ACL重建后，等速偏心训练比传统的偏心训练对四头肌肌肉质量和休闲运动员的力量有更大的反应。