Department of Physical Therapy, City University of New York / College of Staten Island, Staten Island, New York, United States of America.
Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada.
PLoS One. 2019 Dec 17;14(12):e0226596. doi: 10.1371/journal.pone.0226596. eCollection 2019.
The present study examined the effects of selective digital deafferentation on the multi-finger synergies as a function of total force requirement and the number of digits involved in isometric pressing. 12 healthy adults participated in maximal and sub-maximal isometric pressing tasks with or without digital anesthesia to selective digits from the right hand. Our results indicate that selective anesthesia paradigm induces changes in both anesthetized (local) and non-anesthetized (non-local) digits' performance, including: (1) decreased maximal force abilities in both local and non-local digits; (2) reduced force share during multi-finger tasks from non-local but not local digits; (3) decreased force error-making; and (4) marginally increased motor synergies. These results reinforce the contribution of somatosensory feedback in the process of maximal voluntary contraction force, motor performance, and indicate that somatosensation may play a role in optimizing secondary goals during isometric force production rather than ensuring task performance.
本研究考察了选择性数字去传入对多手指协同作用的影响，作为总力需求和参与等长按压的手指数量的函数。12 名健康成年人参与了最大和次最大等长按压任务，有或没有选择性手指的数字麻醉，来自右手。我们的结果表明，选择性麻醉范式诱导了麻醉（局部）和非麻醉（非局部）手指表现的变化，包括：（1）局部和非局部手指的最大力能力下降；（2）来自非局部但非局部手指的多手指任务的力分担减少；（3）力错误减少；（4）运动协同作用略有增加。这些结果加强了躯体感觉反馈在最大随意收缩力、运动表现过程中的贡献，并表明躯体感觉可能在等长力产生过程中优化次要目标方面发挥作用，而不是确保任务表现。
