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首页> 外文期刊>Journal of Biomechanics >Phalanx force magnitude and trajectory deviation increased during power grip with an increased coefficient of friction at the hand-object interface.
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Phalanx force magnitude and trajectory deviation increased during power grip with an increased coefficient of friction at the hand-object interface.

机译：在握力过程中，指骨力的大小和轨迹偏离随着手-物体界面处的摩擦系数的增加而增加。

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This study examined the effect of friction between the hand and grip surface on a person's grip strategy and force generation capacity. Twelve young healthy adults performed power grip exertions on an instrumented vertical cylinder with the maximum and 50% of maximum efforts (far above the grip force required to hold the cylinder), while normal and shear forces at each phalanx of all five fingers in the direction orthogonal to the gravity were recorded. The cylinder surface was varied for high-friction rubber and low-friction paper coverings. An increase in surface friction by replacing the paper covering with the rubber covering resulted in 4% greater mean phalanx normal force (perpendicular to the cylinder surface) and 22% greater mean phalanx shear force in either the proximal or distal direction of the digits (p<0.05; for both 50% and maximum grip efforts). Consequently, increased friction with the rubber surface compared to the paper surface was associated with a 20% increase in the angular deviation of the phalanx force from the direction normal to the cylinder surface (p<0.05). This study demonstrates that people significantly changed the magnitude and direction of phalanx forces depending on the surface they gripped. Such change in the grip strategy appears to help increase grip force generation capacity. This finding suggests that a seemingly simple power grip exertion involves sensory feedback-based motor control, and that people's power grip capacity may be reduced in cases of numbness, glove use, or injuries resulting in reduced sensation.
机译：这项研究检查了手与握持表面之间的摩擦力对人的握持策略和力量产生能力的影响。十二名健康的年轻成年人以最大力和最大力的50％（远高于握住圆柱体所需的抓力）在器械垂直圆柱体上进行力量抓握动作，而所有五个手指的每个指骨在该方向上的法向力和剪切力记录与重力垂直的坐标。气缸表面因高摩擦橡胶和低摩擦纸覆盖层而异。通过用橡胶覆盖物代替纸覆盖物而增加的表面摩擦力使指骨近端或远端方向上的平均指骨法向力（垂直于圆柱面）增大了4％，平均指骨剪切力增大了22％（p <0.05;对于50％和最大抓地力都有效。因此，与纸面相比，与橡胶面的摩擦增加与指法力从垂直于圆柱面方向的角度偏移量增加20％有关（p <0.05）。这项研究表明，人们可以根据所握住的表面显着改变指节力量的大小和方向。抓地策略的这种改变似乎有助于增加抓地力的产生能力。这一发现表明，看似简单的电动握力动作涉及基于感觉反馈的运动控制，并且在麻木，戴手套或受伤导致感觉降低的情况下，人们的电动握力能力可能会降低。

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