Efficacy of Blood Flow-Restricted Low-Load Resistance Training For Quadriceps Strengthening in Men at Risk of Symptomatic Knee Osteoarthritis.
Efficacy of Blood Flow-Restricted Low-Load Resistance Training For Quadriceps Strengthening in Men at Risk of Symptomatic Knee Osteoarthritis.
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DOI：
10.1177/2151458515583088
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发表时间：
2015-09
影响因子：
1.6
通讯作者：
Mikesky AE
中科院分区：
文献类型：
--
作者：
Segal N;Davis MD;Mikesky AE
更大的股四头肌力量与老年人症状性膝关节骨关节炎（OA）的风险降低相关。然而，导致膝关节OA风险升高的因素（例如，久坐不动的生活方式、肥胖和膝关节损伤）也导致≥60% 1次重复最大值（1RM）的阻力训练计划耐受性降低。因此，本研究评估了在低负荷阻力训练中同时应用血流限制（BFR）是否是改善有症状性膝关节OA风险的男性股四头肌力量的有效且可耐受的方法。年龄大于45岁，有膝关节损伤史或体重指数（BMI）升高史的男性，随机接受低负荷阻力训练（30% 1RM），同时接受或不接受BFR。在训练前和训练4周后进行等张双腿推举力量和等速膝伸肌力量测试，每周3次。评估膝关节疼痛（膝关节骨关节炎结局评分）的耐受性。在随机分配的42名男性（平均年龄56.1 ± 7.7岁）中，41名完成了该项目。基线时，年龄、BMI、膝关节病理学或肌肉强度无显著组间差异。尽管对照组和BFR组的腿部推举1RM都有所改善，但在肌肉力量的主要或次要测量方面没有显著的组间差异。BFR与膝关节疼痛恶化无关，但对照组的膝关节疼痛有显著改善。与不使用BFR的训练相比，在30% 1RM阻力训练中添加BFR 4周并没有显著增加具有症状性膝关节OA风险因素的老年男性的腿部压力或股四头肌力量。
Greater quadriceps strength has been associated with lower risk of symptomatic knee osteoarthritis (OA) in older adults. However, factors that confer elevated risk of knee OA (eg, sedentary lifestyle, obesity, and knee injury) also contribute to a reduced tolerance of resistance training programs at ≥60% 1-repetition maximum (1RM). Therefore, the current study assessed whether concurrent application of blood flow restriction (BFR) to low-load resistance training is an efficacious and tolerable means of improving quadriceps strength in men at risk of symptomatic knee OA. Men older than age 45, with a history of knee injury or elevated body mass index (BMI), were randomized to low-load resistance training (30% 1RM) either with or without concurrent BFR. Isotonic double-leg press strength and isokinetic knee extensor strength were assessed before and after 4 weeks of training 3 times/wk. Knee pain (Knee Osteoarthritis Outcome Score) was assessed for tolerance. Of the 42 men (mean age 56.1 ± 7.7 years) who were randomized, 41 completed the program. There were no significant intergroup differences in age, BMI, knee pathology, or muscle strength at baseline. Although leg press 1RM improved in both control and BFR groups, there were no significant intergroup differences in primary or secondary measures of muscle strength. The BFR was not associated with worsening of knee pain, but there was a significant improvement in knee pain in the control group. In comparison with training without BFR, addition of BFR to 30% 1RM resistance training for 4 weeks did not confer significantly greater increases in leg press or quadriceps strength in older men with risk factors for symptomatic knee OA.