Determining the Individual Stiffnesses of the Quadriceps Muscles during Quadriceps Setting Using Shear Wave Elastography

[Purpose] The purpose of this study was to measure the muscle stiffness of the quadriceps muscle during quadriceps setting using ultrasound shear wave elastography (SWE), and to clarify individual quadriceps muscle activity. [Subjects and Methods] The subjects were 14 healthy young men. The subjects sat in a long sitting position with their hips flexed at 55 degrees, and their knees flexed at 0 degrees. For the measurement of muscle stiffness, the quadriceps muscles were measured randomly using the SWE mode of an ultrasound diagnostic apparatus. The index of muscle activity was defined as the rate of muscle stiffness between muscle relaxation and contraction. [Results] The stiffness of the vastus intermedius (VI) was significantly higher than that of the other muscles. There were no significant differences in stiffness between the other muscles. [Conclusion] This study demonstrated that quadriceps setting needs to primarily consider the muscle activity of VI.〔目的〕超音波Shear Wave Elastography（SWE）を用い大腿四頭筋のセッティング運動における大腿四頭筋の筋硬度を測定し，大腿四頭筋各筋の筋活動の違いを明らかにすることとした．〔対象と方法〕対象は健常男性14名の右下肢とし，測定肢位は股関節55°屈曲位の長座位姿勢とした．運動課題は膝関節0°伸展位で膝窩を支点とした膝関節伸展運動を実施し，筋硬度測定は，大腿四頭筋各筋に対して超音波診断装置のSWEモードを用い無作為にて測定した．筋弛緩と収縮時での筋硬度の変化率を検討した．〔結果〕中間広筋は他の3筋に対して有意に筋硬度が高値であり，その他の筋間には有意差を認めなかった．〔結語〕膝関節伸展位では大腿四頭筋のうち中間広筋の活動が重要であることが示唆された．東京都立大学学位論文甲第1249号 副論文journal articl