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| 1 | Residual force enhancement due to active muscle lengthening allows similar reductions in neuromuscular activation during position-and force-control tasks显示文摘Background:Residual torque enhancement(rTE)is the increase in torque observed during the isometric steady state following active muscle lengthening when compared with a fixed-end isometric contraction at the same muscle length and level of neuromuscular activation.In the rTE state,owing to an elevated contribution of passive force to total force production,less active force is required,and there is a subsequent reduction in activation.In vivo studies of rTE reporting an activation reduction are often performed using a dynamometer,where participants contract against a rigid restraint,resisting a torque motor.rTE has yet to be investigated during a position task,which involves the displacement of an inertial load with positional control.Methods:A total of 12 participants(6 males,6 females;age=22.8±1.1 years,height=174.7±8.6 cm,mass=82.1±37.7 kg;mean±SD)completed torque-and position-matching tasks at 60%maximum voluntary contraction for a fixed-end isometric contraction and an isometric contraction following active lengthening of the ankle dorsiflexors.Results:There were no significant differences in activation between torque-and position-matching tasks(p=0.743),with^27%activation reduction following active lengthening for both task types(p<0.001).Conclusion:These results indicate that rTE is a feature of voluntary,position-controlled contractions.These findings support and extend previous findings of isometric torque-control conditions to position-controlled contractions that represent different tasks of daily living. | Rhiannon Marion Geoffrey A.Power | 2020 | Journal of Sport and Health Science2020，9，6： | 0 |
| 2 | 运动单位衰老与肌肉功能退化之间的关系显示文摘肌肉萎缩与运动单位衰老关系密切,目前研究表明运动单位衰老可能是老年人肌肉功能退化的主要原因.运用文献综述法对国内外相关研究仔细梳理,就老龄化相关的运动单位性质改变做阐释,并解释以此作为可能机制对肌肉力量下降与身体功能表现下降的原因.从神经控制层面激发新的临床干预方式来评估和治疗肌肉萎缩症并讨论性别差异在肌肉功能力量下降中的表现. | 聂小锋 | 2022 | 商丘师范学院学报2022，38，6： | 0 |
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