Perceived effort in force production as reflected in motor-related cortical potentials
Perceived effort in force production as reflected in motor-related cortical potentials
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DOI：
10.1016/j.clinph.2004.05.021
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发表时间：
2004-10-01
影响因子：
4.7
通讯作者：
Newell, KM
中科院分区：
文献类型：
--
作者：
Slobounov, S;Hallett, M;Newell, KM
目的：在一系列实验中研究了力产生中的感知努力，其中受试者用食指执行等长力任务，同时控制名义力、力发展速率和信号增益，并获得每个任务的努力评级。所检验的假设是：（1）与力相关的感知努力可能选择性地影响运动相关皮层电位（MRCP）的振幅;（2）MRCP可能直接反映与力产生相关的感知努力的强度。力的轨迹显示在计算机显示器上，使用各种控制-增益，使得感知的努力与施加到测压元件以完成任务的实际肌肉努力相匹配或不一致。结果：（1）知觉努力随力发展率和力误差的增加而增加，但与实际力水平无关：（2）当力发展率增加时，MRCP的幅值增加;（3）MRCP早期分量在加力前的幅值（MP-100到0）作为预期努力的函数增加，而伴随力产生的幅度运动监测电位（MNIP）作为实际力水平的函数增加。这项研究的结果提供了额外的见解，澄清了不同程度的感知与力输出相关的努力下表现出的EEG活动的不同模式。研究结果支持这一假设，MRCP的早期组件可能反映了感知的努力与实现所需的力level.Significance：从这项研究的结果可以被认为是在更大的范围内的身体活动的重要性，在规定的运动在康复计划。(C)2004年由Elsevier爱尔兰有限公司代表国际临床神经生理学联合会出版。
Objective: The perceived effort in force production was investigated in a series of experiments where subjects performed isometric force tasks with the index finger while the nominal force, the rate of force development and signal gain were controlled and rating of effort for each task was obtained. The hypotheses tested were that: (1) force-related perceived effort may selectively influence the amplitude of motor-related cortical potentials (MRCP); and (2) the MRCP may directly reflect the intensity of perceived effort associated with force production.Methods: The force trace was displayed on a computer monitor using various control-gains so that the perceived effort matched or was at odds with actual muscular effort applied to the load cell to accomplish the task. The MRCP were extracted from continuous EEG records using averaging techniques.Results: The findings showed that: (1) perceived effort proportionally increased with the increment of rate of force development and force error, but not with the actual force level; (2) the amplitude of the MRCP increased when a large amount of force was accompanied by an increased rate of force development; (3) the amplitude of early components of MRCP preceding the force initiation (MP-100 to 0) increased as a function of anticipated effort, whereas, the amplitude movement-monitoring potentials (MNIP) accompanying the force production increased as a function of actual force level.Conclusions: The findings from this study provide additional insight clarifying the distinct patterns of EEG activity exhibited under various degrees of perceived effort associated with force output. The findings support the hypothesis that the early components of MRCP may reflect the perceived effort associated with achieving the required force level.Significance: The results from this study may be considered in the larger context of physical activity in terms of importance of perceived effort during prescribed exercise in rehabilitation programs. (C) 2004 Published by Elsevier Ireland Ltd. on behalf of International Federation of Clinical Neurophysiology.