Anticipatory postural adjustments during load catching by standing subjects
Anticipatory postural adjustments during load catching by standing subjects
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DOI：
10.1016/s1388-2457(01)00553-3
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发表时间：
2001-07-01
影响因子：
4.7
通讯作者：
Latash, ML
中科院分区：
文献类型：
--
作者：
Shiratori, T;Latash, ML
目标：(1) 研究在接住受试者自己或实验者释放的负荷之前，手臂和躯干/腿部肌肉产生预期姿势调整 (APA) 的差异。 (2) 研究在接住负荷之前，冲击时负载的不同机械特性对于产生 APA 的重要性。方法：要求受试者站立，接住由实验者或受试者的右手从不同高度落到左手上的负载。控制负载质量和释放高度，以保持负载的质量或动量在冲击时恒定。 APA 通过积分肌电图指数进行量化。结果：在自我释放试验和实验者释放试验中，在负载冲击之前，在腿部、躯干和手臂肌肉中观察到 APA。与动量相比，动能与 APA 大小的相关性更高，但仅限于实验者释放试验。结论：在没有明确的自愿动作的情况下，受试者可以在手臂和躯干/腿部肌肉中产生 APA。动能和动量对于定义 APA 大小的相对重要性可以反映用于为自我和实验者释放负载捕获期间即将到来的扰动做准备的信息来源的差异。 (C) 2001 Elsevier Science ireland Ltd. 保留所有权利。
Objectives: (1) To study differences in the generation of anticipatory postural adjustments (APAs) in arm and trunk/leg muscles prior to catching a load released either by the: subject him-/herself or by the experimenter (2) To study the importance of different mechanical characteristics of the load at impact for the generation of APAs prior to load catching.Methods: Standing subjects were asked to catch loads dropped onto the left hand from different heights either by the experimenter or by the subject's right hand. The load mass and release height were manipulated to keep either the mass or the momentum of the load at impact constant. APAs were quantified with integral electromyographic indices.Results: APAs were observed in leg, trunk and arm muscles prior to load impact for both self and experimenter-release trials. Kinetic energy showed higher correlations with the magnitude of APA than momentum, but only in experimenter-release trials.Conclusions: Subjects can generate APAs in both arm and trunk/leg muscles in the absence of an explicit voluntary action. The relative importance of kinetic energy and momentum for defining the magnitude of APAs can reflect the difference in the sources of information used to prepare for the forthcoming perturbation during self- and experimenter-released load catch. (C) 2001 Elsevier Science ireland Ltd. All rights reserved.