基于肌骨超声与肌张力测量的股直肌急性抗阻疲劳动态评估

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【中图分类号】G804 【文献标识码】A 【文章编号】2095-2813（2025）25-0001-07

[Abstract] Objective： The purpose of the paper is to asess morphological and biomechanical changes in the rectus femoris muscle during acute resistance training to fatigue by combining musculoskeletal ultrasound and muscle tone measurement techniques，and to explore the complementary value of multimodal techniques.Methods： Thirty-five healthy young adults （2O males，15 females）were subjected to single leg knee extension resistance trainingat 80% maximum repetitive load （1 RM） until exhaustion （3 groups rested for 3 minute between each group）.Baseline and post training morphological indicatorsof the rectus femoris muscle were collcted，including muscle thickness（MT）， cross-sectional area （CSA），echo intensity （EI），and biomechanical indicators suchasoscilation frequency（F），and dynamic stiffness （S）.Results：Except for EI，all other indicators showed significant time effects （P<0.001） .After resistance training，MT， CSA，F，and S significantly increased compared to baseline （ P values were all less than 0.05）;

There is a low to strong correlation between 第三次测试 and baseline （ Δ value） （Pearson's r value is O.37-0.58）. Conclusion： Resistance training until fatigue can induce acute sweling of the rectus femoris muscle （increased MTand CSA），butEI exhibits limitedsensitivity tofatigue;Early elevationofFandSsuggest thattheycanserveas biomechanical markers forfatigue warning.The combinedapplication of musculoskeletal ultrasound and muscle tone measurement reveals dynamic muscle morphology and mechanics coupling characteristics，and has the advantage of multidimensional complementary assessment.

[Keywords] Rectus femoris fatigue; Muscle bone ultrasound; Muscle tone measurement; Resistance training

肌肉疲劳是指持续收缩运动后维持预期收缩力的能力下降，这一概念由EDWARDSR H[1] 于1981年首次提出，并得到广泛认可。（剩余14530字）