Decreased muscle quality (MQ) may explain functional capacity impairments during aging. Thus, it is essential to verify the interaction between MQ and functional capacity in older adults. We investigated the relationship between MQ and functional capacity in older adults (n = 34; 66.3 ± 4.6 year). MQ was estimated by maximum strength of knee extensors normalized to thigh muscle mass. Maximum strength was assessed on an isokinetic dynamometer (peak torque), while dual-energy X-ray absorptiometry (DXA), ultrasonography, and anthropometry were used to determine thigh muscle mass. Functional capacity was verified by 30-s sit to stand and timed up and go tests. Significant correlations were found between MQ assessed by DXA with 30-s sit to stand (r = .35; p < .05) and timed up and go (r = -.47; p < .05), and MQ assessed by anthropometry with timed up and go (r = -.41; p < .05), but not between MQ assessed by ultrasonography with functional capacity (p > .05). No significant relationship between muscle mass with functional capacity was observed. Thus, MQ assessed by DXA and MQ assessed by anthropometry may partially explain functional capacity in older adults. Interestingly, muscle mass alone did not explain performance in functional tests in this population.

中文翻译：

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双能 X 射线吸收测定法、超声检查法和人体测量法评估老年人肌肉质量和肌肉质量的关系。

肌肉质量 (MQ) 下降可以解释衰老过程中的功能能力损伤。因此，必须验证老年人 MQ 与功能能力之间的相互作用。我们调查了老年人（n = 34；66.3 ± 4.6 岁）MQ 与功能能力之间的关系。MQ 是通过标准化为大腿肌肉质量的膝伸肌的最大力量来估计的。在等速测力计（峰值扭矩）上评估最大力量，同时使用双能 X 射线吸收测定法 (DXA)、超声检查和人体测量学来确定大腿肌肉质量。功能能力通过 30 秒的坐站和计时测试来验证。在 DXA 评估的 MQ 与 30 秒坐立（r = .35；p < .05）和计时起走（r = -.47；p < .05）之间发现了显着相关性，和 MQ 通过人体测量法评估的时间起床和走动 (r = -.41; p < .05)，但不是在通过具有功能能力的超声检查评估的 MQ 之间 (p > .05)。没有观察到肌肉质量与功能能力之间存在显着关系。因此，通过 DXA 评估的 MQ 和通过人体测量评估的 MQ 可以部分解释老年人的功能能力。有趣的是，单凭肌肉质量并不能解释该人群在功能测试中的表现。