Voskuil Caleb, Dudar Monique, Zhang Yan, Carr Joshua
Department of Kinesiology, Texas Christian University, Fort Worth, TX 76129, USA.
Harris College of Nursing & Health Sciences, Texas Christian University, Fort Worth, TX 76109, USA.
Muscles. 2023 Mar 23;2(2):109-118. doi: 10.3390/muscles2020010.
This study examines the relationships between ultrasonography measurements of skeletal muscle size and echo intensity (EI) with muscle strength and local muscle endurance in a habitually resistance-trained population. Twenty young, healthy participants underwent imaging of the biceps brachii in the sagittal and transverse planes and with the extended field of view (EFOV) technique. Linear regression was used to examine measures of muscle thickness (MT), muscle cross-sectional area (mCSA), EI, and corrected EI (cEI) in each scanning plane for their associations with strength (1RM biceps curl) and local muscle endurance (4x failure @ 50%1RM). The strongest predictor of 1RM strength and local muscle endurance was sagittal MT (adj. R = 0.682) and sagittal cEI (adj. R = 0.449), respectively. Strength and transverse MT (R = 0.661) and the EFOV mCSA (R = 0.643) demonstrated a positive relationship. Local muscle endurance and cEI in the transverse plane (R = 0.265) and the EFOV scan (R = 0.309) demonstrated a negative relationship. No associations were shown with uncorrected EI. While each scanning plane supports the muscle size-strength and echogenicity-endurance relationships, sagittal plane imaging demonstrated the strongest associations with muscle fitness. These findings provide important methodological insights regarding ultrasound imaging and muscle fitness relationships.
本研究探讨了在习惯性进行抗阻训练的人群中，骨骼肌大小的超声测量值与回声强度（EI）之间的关系，以及它们与肌肉力量和局部肌肉耐力的关系。20名年轻健康的参与者接受了肱二头肌矢状面、横断面成像以及扩展视野（EFOV）技术成像。采用线性回归分析每个扫描平面上的肌肉厚度（MT）、肌肉横截面积（mCSA）、EI和校正后的EI（cEI）与力量（肱二头肌弯举1RM）和局部肌肉耐力（50%1RM负荷下4次重复至力竭）之间的关联。1RM力量和局部肌肉耐力的最强预测指标分别是矢状面MT（调整后R = 0.682）和矢状面cEI（调整后R = 0.449）。力量与横断面MT（R = 0.661）和EFOV mCSA（R = 0.643）呈正相关。局部肌肉耐力与横断面cEI（R = 0.265）和EFOV扫描（R = 0.309）呈负相关。未校正的EI未显示出相关性。虽然每个扫描平面都支持肌肉大小与力量以及回声性与耐力之间的关系，但矢状面成像显示与肌肉适应性的关联最强。这些发现为超声成像与肌肉适应性关系提供了重要的方法学见解。
