ASSESSMENT OF HUMAN KNEE EXTENSOR MUSCLES STRESS FROM INVIVO PHYSIOLOGICAL CROSS-SECTIONAL AREA AND STRENGTH MEASUREMENTS
ASSESSMENT OF HUMAN KNEE EXTENSOR MUSCLES STRESS FROM INVIVO PHYSIOLOGICAL CROSS-SECTIONAL AREA AND STRENGTH MEASUREMENTS
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DOI：
10.1007/bf00243511
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发表时间：
1992-11-01
期刊：
影响因子：
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通讯作者：
MINETTI, AE
中科院分区：
文献类型：
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作者：
NARICI, MV;LANDONI, L;MINETTI, AE
应用核磁共振成像（MRI）技术，对6名健康男性志愿者的股外侧肌（VL）、股中间肌（VI）、股内侧肌（VM）和股直肌（RF）的生理截面积（CSAp）进行了测量。在所有受试者中，在峰值力发生的最佳角度测量等长最大自主收缩强度（MVC）。踝关节处的MVC为746.0（SD 141.8）N，其肌腱分量（F（t））为6.367（SD 1.113）kN，其机械优势为0.117（SD 0.010）。为了计算沿每块肌肉的纤维沿着作用的力（F（f）），将F（t）除以羽角的余弦并乘以（CSAp.SIGMACSAp-1），其中SIGMACSAp是四块肌肉的CSAp之和。VL、VI、VM和RF的F（f）值分别为：1.452（SD 0.531）kN、1.997（SD 0.187）kN、1.914（SD 0.827）kN和1.601（SD 0.306）kN。通过将这些力除以相应的CSAp获得每块肌肉的应力，CSAp为：6.24 x 10（-3）（SD 2.54 x 10（-3））M2 对于VL，8.35 x 10（-3）（SD 1.17 x 10（-3））M2 对于VI，6.80 x 10（-3）（SD 2.66 x 10（-3））m2对于VM和6.62 x 10（-3） (SD 1.21 X 10（-3））M2 对于RF。VL、VI、VM和RF的应力平均值为250（SD 19）kN m-2;该值与动物肌肉和人平行肌的数据吻合良好。
The physiological cross-sectional areas (CSAp) of the vastus lateralis (VL), vastus intermedius (VI), vastus medialis (VM) and rectus femoris (RF) were obtained, in vivo, from the reconstructed muscle volumes, angles of pennation and distance between tendons of six healthy male volunteers by nuclear magnetic resonance imaging (MRI). In all subjects, the isometric maximum voluntary contraction strength (MVC) was measured at the optimum angle at which peak force occurred. The MVC developed at the ankle was 746.0 (SD 141.8) N and its tendon component (F(t)), given by a mechanical advantage of 0.117 (SD 0.010), was 6.367 (SD 1.113) kN. To calculate the force acting along the fibres (F(f)) of each muscle, F(t) was divided by the cosine of the angle of pennation and multiplied for (CSAp.SIGMACSAp-1), where SIGMACSAp was the sum of CSAp of the four muscles. The resulting F(f) values of VL, VI, VM and RF were: 1.452 (SD 0.531) kN, 1.997 (SD 0.187) kN, 1.914 (SD 0.827) kN, and 1.601 (SD 0.306) kN, respectively. The stress of each muscle was obtained by dividing these forces for the respective CSAp which was: 6.24 x 10(-3) (SD 2.54 x 10(-3)) M2 for VL, 8.35 x 10(-3) (SD 1.17 x 10(-3)) M2 for VI, 6.80 x 10(-3) (SD 2.66 x 10(-3)) m2 for VM and 6.62 x 10(-3) (SD 1.21 X 10(-3)) M2 for RF. The mean value of stress of VL, VI, VM and RF was 250 (SD 19) kN m-2; this value is in good agreement with data on animal muscle and those on human parallel-fibred muscle.