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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Physiological and functional responses to low-moderate versus high-intensity progressive resistance training in frail elders.
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Physiological and functional responses to low-moderate versus high-intensity progressive resistance training in frail elders.

机译：体弱长者对低强度与高强度进行性抵抗训练的生理和功能反应。

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BACKGROUND: The purpose of this efficacy study was to measure the dose-response effect of a free weight-based resistance training program by comparing the effects of two training intensities (low-moderate and high) of the knee extensor (KE) muscles on muscle function, functional limitations, and self-reported disability. METHODS: The authors conducted a single-blinded, randomized, placebo-controlled trial. Twenty-two institutionalized elders (mean age, 81.5 years) were assigned to either high-intensity strength training (HI; n = 8), low-moderate intensity strength training (LI; n = 6), or weight-free placebo-control training (PC; n = 8). The HI group trained at 80% of their 1-repetition maximum and the LI group trained at 40%. All groups performed 3 sets of 8 repetitions, 3 times per week for 10 weeks. Outcome measures included KE maximal strength, KE endurance, and functional performance as assessed by 6-minute walking, chair-rising, and stair-climbing tests, and by self-reported disability. RESULTS: KE strength and endurance, stair-climbing power, and chair-rising time improved significantly in the HI and LI groups compared with the PC group. Six-minute walking distance improved significantly in the HI group but not in the LI group compared with the PC group. Changes observed in HI were significantly different from those observed in the LI group for KE strength and endurance and the 6-minute walking test, with a trend in the same direction for chair-rising and stair-climbing. Changes in strength were significantly related to changes in functional outcomes, explaining 37% to 61% of the variance. CONCLUSIONS: These results show strong dose-response relationships between resistance training intensity and strength gains, and between strength gains and functional improvements after resistance training. Low-moderate intensity resistance training of the KE muscles may not be sufficiently robust from a physiologic perspective to achieve optimal improvement of functional performance. Supervised HI, free weight-based training for frail elders appears to be as safe as lower intensity training but is more effective physiologically and functionally.
机译：背景：这项功效研究的目的是通过比较两种膝部伸肌（KE）肌肉训练强度（低，中和高）对肌肉的影响，来测量基于自由重量的阻力训练计划的剂量反应效果功能，功能限制和自我报告的残疾。方法：作者进行了单盲，随机，安慰剂对照试验。 22名机构化的老年人（平均年龄81.5岁）被分配为高强度力量训练（HI; n = 8），低强度强度力量训练（LI; n = 6）或无体重安慰剂对照训练（PC; n = 8）。 HI组训练其1次重复最大值的80％，LI组训练为40％。所有组进行3组，共8次重复，每周3次，共10周。结果测量包括KE最大强度，KE耐力和功能表现（通过6分钟的步行，椅子上升和爬楼梯测试以及自我报告的残疾评估）。结果：与PC组相比，HI和LI组的KE强度和耐力，爬楼梯的力量和坐椅的时间显着改善。与PC组相比，HI组的六分钟步行距离有明显改善，而LI组则没有。 HI观察到的变化与LI组观察到的KE强度和耐力以及6分钟步行测试的变化显着不同，椅上升和爬楼梯的趋势相同。力量的变化与功能结局的变化显着相关，解释了37％至61％的差异。结论：这些结果表明阻力训练强度和力量增加之间以及阻力训练后力量增加和功能改善之间强烈的剂量反应关系。从生理的角度来看，对KE肌肉的低中度强度阻力训练可能不足以实现功能性能的最佳改善。对体弱长者的有监督的HI，自由重量训练似乎与强度较低的训练一样安全，但在生理和功能上更为有效。

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