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Force-velocity and length-tension properties of stimulated human quadriceps muscle in spinal cord injured children

机译:受刺激的人股四头肌在脊髓损伤儿童中的力速和长度-张力特性

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The force-velocity and length-tension properties of electrically stimulated quadriceps muscles were determined in a pilot study with two teenage subjects with midthoracic spinal cord injuries. Percutaneous intramuscular electrodes were used to elicit maximal isometric and concentric isokinetic contractions over angles range from 20 degrees to 80 degrees of knee flexion and over speeds from 30 degrees to 150 degrees per second. Submaximal contractions were generated both eccentrically and concentrically. Maximal concentric moment-velocity-angle surfaces were found to be similar in all respects to force-velocity-length surfaces reported for isolated animal preparations. Submaximal profiles grossly approximated the characteristics of maximal contractions. For any joint angle, eccentric moments were generally greater than those produced isometrically or concentrically.
机译:在一项对两名中胸椎脊髓损伤的青少年受试者进行的试验研究中,确定了电刺激的股四头肌的力速和长度-张力特性。使用经皮肌内电极在每秒屈曲20度至80度的角度和每秒30度至150度的速度范围内引起最大等距和同心等速收缩。偏心和同心都产生了次最大的收缩。发现最大同心矩-速度-角度表面在所有方面都与为单独的动物制剂报道的力-速度-长度表面相似。次最大轮廓大体上近似最大收缩的特征。对于任何关节角度,偏心力矩通常都大于等距或同心产生的力矩。

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