Stock Matt S, Whitson Morgan, Burton Adam M, Dawson Nicole T, Sobolewski Eric J, Thompson Brennan J
Applied Physiology Laboratory, Doctor of Physical Therapy Program, University of Central Florida, Orlando, Florida, USA.
Sherman Clinical Research, Sherman, Texas, USA.
Ultrasound Med Biol. 2018 Aug;44(8):1597-1605. doi: 10.1016/j.ultrasmedbio.2018.04.009.
Recently, an equation that allows investigators to correct echo intensity for subcutaneous fat was developed. We evaluated correlations between uncorrected and corrected echo intensity versus measures of lower-extremity function. Twenty-three older adults (11 men, 12 women; mean age = 72 y) participated. B-Mode ultrasonography was used to quantify rectus femoris echo intensity and subcutaneous fat thickness. Knee extensor isometric peak torque and rate of torque development at 200 ms (RTD200) were determined (joint angle = 90°). Fast gait speed was evaluated at 10- and 400-m distances. Partial correlations between normalized peak torque, RTD200 and 10- and 400-m gait speed versus uncorrected echo intensity were weak and insignificant. Correction for subcutaneous fat strengthened the correlations (peak torque r = -0.500, RTD200 r= -0.425, 10-m r = -0.409, 400-m r = -0.410). Correcting echo intensity values for subcutaneous fat strengthened the associations with lower-extremity muscle function in older adults.
最近，研究人员开发了一个方程，可用于校正皮下脂肪对回声强度的影响。我们评估了未校正和校正后的回声强度与下肢功能指标之间的相关性。23名老年人（11名男性，12名女性；平均年龄 = 72岁）参与了研究。使用B型超声检查来量化股直肌的回声强度和皮下脂肪厚度。测定了膝关节伸展等长收缩的峰值扭矩和200毫秒时的扭矩发展速率（RTD200）（关节角度 = 90°）。评估了10米和400米距离处的快速步态速度。标准化峰值扭矩、RTD200以及10米和400米步态速度与未校正回声强度之间的偏相关性较弱且无统计学意义。校正皮下脂肪后，相关性增强（峰值扭矩r = -0.500，RTD200 r = -0.425，10米r = -0.409，400米r = -0.410）。校正皮下脂肪后的回声强度值增强了与老年人下肢肌肉功能的关联。
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