We investigated the relationship between impedance parameters and skeletal muscle function in the lower extremities, as well as the effectiveness of impedance parameters in evaluating muscle quality. Lower extremity impedance of 19 healthy men (aged 23–31 years) measured using the direct segmental multi-frequency bioelectrical impedance analysis were arc-optimized using the Cole–Cole model, following which phase angle (PA), \({R}_{i}/{R}_{e}\), and β were estimated. Skeletal muscle function was assessed by muscle thickness, muscle intensity, and isometric knee extension force (IKEF). IKEF was positively correlated with PA ( r  = 0.58, p  < 0.01) and β ( r  = 0.34, p  < 0.05) was negatively correlated with \({R}_{i}/{R}_{e}\) ( r  = − 0.43, p  < 0.01). Stepwise multiple regression analysis results revealed that PA, β, and \({R}_{i}/{R}_{e}\) were correlated with IKEF independently of muscle thickness. This study suggests that arc-optimized impedance parameters are effective for evaluating muscle quality and prediction of muscle strength.

中文翻译：

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阻抗参数对健康男性肌肉质量评估的有效性

我们研究了阻抗参数与下肢骨骼肌功能之间的关系，以及阻抗参数在评估肌肉质量方面的有效性。使用直接分段多频生物电阻抗分析测量的 19 名健康男性（23-31 岁）的下肢阻抗使用 Cole-Cole 模型进行弧优化，随后相位角 (PA)，\({R}_ {i}/{R}_{e}\) 和 β 被估计。通过肌肉厚度、肌肉强度和等长膝关节伸展力 (IKEF) 评估骨骼肌功能。IKEF 与 PA ( r  = 0.58, p  < 0.01) 和 β ( r  = 0.34, p  < 0.05) 与 \({R}_{i}/{R}_{e}\) 呈负相关（ r  = − 0.43， p  < 0.01）。逐步多元回归分析结果显示，PA、β 和 \({R}_{i}/{R}_{e}\) 与 IKEF 相关，与肌肉厚度无关。这项研究表明，弧优化阻抗参数对于评估肌肉质量和预测肌肉力量是有效的。