Reschechtko Sasha, Wang Hu, Alendry Kerlin, Benson Cynthia, Hahn Barry, Zhang Wei
Department of Physical Therapy, College of Staten Island, City University of New York, Staten Island, NY, USA.
Department of Kinesiology, The Pennsylvania State University, State College, PA, USA.
J Mot Behav. 2020;52(1):58-70. doi: 10.1080/00222895.2019.1580670. Epub 2019 Mar 8.
The present study investigates the effect of sensory deprivation of the index and middle finger on motor function of all digits during maximal voluntary force production tasks. A total of 27 subjects performed maximal isometric pressing tasks by using different instructed finger combinations. Subjects completed the same tasks in two visits: a control visit when they had normal sensory feedback in all fingers, and an anesthesia visit when digital nerve blocks were performed on their right index and middle fingers. We evaluated three aspects of motor adaptation on both local (anesthetized) and non-local (non-anesthetized) digits during maximal force production: (1) task-relevant and overall force magnitude, (2) force directional application, and (3) digital individuation and force sharing. Our results indicate that selective digital anesthesia resulted in decreased maximal force magnitude, changed direction of force production, and significant changes extended to non-local digits. The motor weakness and inefficiency revealed in the non-local digits implies that sensory information from each digit can be shared across the digits to assist motor execution within the same hand.
本研究调查了示指和中指感觉剥夺对最大自主用力任务期间所有手指运动功能的影响。共有27名受试者通过使用不同的指定手指组合进行最大等长按压任务。受试者在两次就诊中完成相同任务：一次是对照就诊，此时他们所有手指的感觉反馈正常；另一次是麻醉就诊，此时对其右手示指和中指进行指神经阻滞。我们评估了最大用力过程中局部（麻醉）和非局部（未麻醉）手指运动适应的三个方面：（1）与任务相关的和总的力大小，（2）力的方向应用，以及（3）手指个体化和力分配。我们的结果表明，选择性指麻醉导致最大力大小降低、力产生方向改变，并且显著变化扩展到非局部手指。非局部手指中显示的运动无力和低效意味着来自每个手指的感觉信息可以在各手指间共享，以协助同一只手内的运动执行。
