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首页> 外文期刊>Journal of Biomechanics >In vivo forces generated by finger flexor muscles do not depend on the rate of fingertip loading during an isometric task
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In vivo forces generated by finger flexor muscles do not depend on the rate of fingertip loading during an isometric task

机译：在等轴测任务中，手指屈肌产生的体内力并不取决于指尖的负荷率

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摘要

Risk factors for activity-related tendon disorders of the hand include applied force, duration, and rate of loading. Understanding the relationship between external loading conditions and internal tendon forces can elucidate their role in injury and rehabilitation. The goal of this investigation is to determine whether the rate of force applied at the fingertip affects in vivo forces in the flexor digitorum profundus (FDP) tendon and the flexor digitorum superficialis (FDS) tendon during an isometric task. Tendon forces, recorded with buckle force transducers, and fingertip forces were simultaneously measured during open carpal tunnel surgery as subjects (N = 15) increased their fingertip force from 0 to 15 N in 1, 3, and 10 s. The rates of 1.5, 5, and 15 N/s did not significantly affect FDP or FDS tendon to fingertip force ratios. For the same applied fingertip force, the FDP tendon generated more force than the FDS. The mean FDP to fingertip ratio was 2.4 +/- 0.7 while the FDS to tip ratio averaged 1.5 +/- 1.0 (p < 0.01). The fine motor control needed to generate isometric force ramps at these specific loading rates probably required similar high activation levels of multiple finger muscles in order to stabilize the finger and control joint torques at the force rates studied. Therefore, for this task, no additional increase in muscle force was observed at higher rates. These findings suggest that for high precision, isometric pinch maneuvers under static finger conditions, tendon forces are independent of loading rate. (c) 2004 Elsevier Ltd. All rights reserved.
机译：与活动有关的手部肌腱疾病的危险因素包括施加的力，持续时间和负荷率。了解外部载荷条件和内部腱力之间的关系可以阐明它们在损伤和康复中的作用。这项研究的目的是确定在等轴测任务期间指尖施加的力的速率是否会影响深指屈肌腱（FDP）肌腱和浅指屈肌腱（FDS）肌腱的体内力。在腕腕开放手术中，同时测量了肌腱力（用屈曲力传感器记录）和指尖力，这是由于受试者（N = 15）在1、3和10 s内将其指尖力从0 N增加到15N。 1.5、5和15 N / s的速率并未显着影响FDP或FDS肌腱与指尖的力比。对于相同的指尖力，FDP肌腱比FDS产生的力更大。平均FDP与指尖之比为2.4 +/- 0.7，而FDS与指尖之比平均为1.5 +/- 1.0（p <0.01）。在这些特定的加载速率下产生等距力斜坡所需的精细电动机控制可能需要多根手指肌肉具有相似的高激活水平，以便在研究的力速率下稳定手指并控制关节扭矩。因此，对于该任务，在较高的速率下未观察到肌肉力量的额外增加。这些发现表明，对于静态手指条件下的高精度等距捏操作，肌腱力与加载速率无关。 （c）2004 Elsevier Ltd.保留所有权利。

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