Institute of Nutrition and Food Technology (INTA), University of Chile, Chile.
Institute of Nutrition and Food Technology (INTA), University of Chile, Chile.
Clin Nutr ESPEN. 2023 Jun;55:420-424. doi: 10.1016/j.clnesp.2023.04.015. Epub 2023 Apr 26.
BACKGROUND & AIMS: Ultrasound can be used to measure the pennation angle between muscle fiver and the presumed axis of force generation and muscle echogenicity as an indicator of muscle fat infiltration. We aimed to assess the association of the rectus femoris pennation angle and echogenicity with muscle functional measures. Also, to assess the concordance of rectus femoris echogenicity with muscle fat infiltration as determined by CT scan.
Rectus femoris ultrasound pennation angle and thickness were measured in 78 participants aged 69 (65,73) years (37 women). Also hand grip strength, gait speed in 4 m, the 12 min' walk and body composition by DEXA were measured. In a different group of 114 participants aged 44 (31,52) years (80 females), non-dominant rectus femoris echogenicity and thickness were measured by ultrasound and muscle fat infiltration was assessed by CT scan. Handgrip strength and quadriceps torque were also measured.
There was a weak correlation between the pennation angle and rectus femoris thickness in men (r = 0.31 p = 0.05) but not in women (r = 0.29 NS). Women, but not men with a low pennation angle covered a longer distance during the 12 min' walk. The concordance between the z scores of rectus femoris echogenicity and CT radiological density was 0.43 (p < 0.01) and 0.01 (NS) in men and women, respectively. Men and women with an echogenicity below the 25th percentile had a higher quadriceps torque. Men with an echogenicity 25th percentile below 25th percentile had also a higher handgrip strength.
Rectus femoris pennation angle had a weak or absent association with muscle performance. Rectus femoris echogenicity had a moderate overall concordance with radiological density by CT scan and was inversely associated with quadriceps torque. Therefore, echogenicity was associated with muscle strength, but pennation angle measurement did not contribute to the assessment of muscle function.
超声可用于测量肌肉纤维与假定的力产生轴之间的斜角和肌肉的超声回声性，作为肌肉脂肪浸润的指标。我们旨在评估股直肌斜角和回声性与肌肉功能测量的相关性。此外，还评估了股直肌回声性与 CT 扫描确定的肌肉脂肪浸润的一致性。
在 78 名年龄为 69（65，73）岁的参与者（37 名女性）中测量股直肌超声斜角和厚度。还测量了握力、4 米的步速、12 分钟步行距离和 DEXA 测定的身体成分。在另一组 114 名年龄为 44（31，52）岁的参与者（80 名女性）中，通过超声测量非优势股直肌回声性和厚度，并通过 CT 扫描评估肌肉脂肪浸润。还测量了握力和股四头肌扭矩。
男性股直肌斜角与厚度之间存在弱相关性（r=0.31，p=0.05），但女性之间没有相关性（r=0.29，NS）。在女性中，而不是男性中，低斜角组在 12 分钟步行距离中覆盖的距离更长。股直肌回声性 z 分数与 CT 放射密度之间的一致性在男性和女性中分别为 0.43（p<0.01）和 0.01（NS）。回声性低于第 25 百分位数的男性和女性股四头肌扭矩更高。回声性低于第 25 百分位数的男性握力也更高。
股直肌斜角与肌肉表现的相关性较弱或不存在。股直肌回声性与 CT 扫描的放射密度具有中等总体一致性，与股四头肌扭矩呈负相关。因此，回声性与肌肉力量相关，但斜角测量对肌肉功能评估没有贡献。
