Cross recurrence quantification analysis of precision grip following peripheral median nerve block.
Cross recurrence quantification analysis of precision grip following peripheral median nerve block.
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周围正中神经阻滞后精确握力的交叉复发量化分析
DOI：
10.1186/1743-0003-10-28
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发表时间：
2013-03-02
影响因子：
5.1
通讯作者：
Li ZM
中科院分区：
文献类型：
--
作者：
Li K;Li ZM
背景拇指和食指的精准握力容易发生感觉运动障碍。传统的生物力学参数对精确抓握过程中手指之间的动态协调提供了有限的洞察力。本研究将拇指和食指视为“耦合系统”，采用交叉递归量化分析(CRQA)研究周围正中神经阻滞前后指间动力学和同步性的变化。方法7名受试者在正中神经阻滞前后手腕握持仪器化手柄进行精确握握。用两个六分量传感器记录每个指柄接口处的力和扭矩。对于CRQA，计算力、扭矩和压力中心(COP)信号的复发率百分比(%RR)、确定性百分比(%DET)、最长对角线(LMAX)和层状百分比(%LAM)。根据τ复发率检测拇指和食指的位相同步性。统计比较采用Pairedt检验和Wilcoxon符号等级检验。结果神经阻滞使%DET、Lmax和%LAM在力、扭矩和COP的所有分量上均显著增加(p<； 0.05)。在所有成功完成的阻断前和阻断后的抓取试验中，只有法向力满足相位同步条件。神经阻滞后有较大时滞的同步化概率增加(τ>； 0.1%，S)。拇指牵着食指的试验比例从阻断前的52%上升到阻断后的86%。结论当拇指与食指相互作用时，神经阻滞在力、力矩和COP方面产生了更多的确定性结构。这种变化可能是由一种补偿机制造成的。拇指和食指施加的相反法向力之间的相位同步将是精确握力的基本动力学原理。神经阻滞导致指间相位延迟增加，拇指指向食指的概率增加。CRQA提供了一种有效的工具来检查精准握力过程中的指间协调，并具有临床评估手功能障碍的潜力。
BackgroundPrecision grip by the thumb and index finger is vulnerable to sensorimotor deficits. Traditional biomechanical parameters offer limited insight into the dynamical coordination between digits during precision grip. In this study, the thumb and index finger were viewed as “coupled systems”, and a cross recurrence quantification analysis (CRQA) was used to examine the changes of interdigit dynamics and synchronization caused by peripheral median nerve block.MethodsSeven subjects performed a precision grip by holding an instrumented handle before and after median nerve block at the wrist. The forces and the torques at each digit-handle interface were recorded with two six-component transducers. For CRQA, the percentage of recurrence rate (%RR), percentage of determinism (%DET), longest diagonal line (Lmax) and percentage of laminarity (%LAM) were computed for the force, torque and center of pressure (COP) signals. Phase synchronization of the thumb and index finger was examined based on theτ-recurrence rate. Pairedt-tests and Wilcoxon signed-rank tests were used for statistical comparisons. The twin-surrogate hypothesis test was used to examine phase synchronization.ResultsNerve block led to significant increases (p< 0.05) for %DET, Lmax and %LAM in all components of force, torque, and COP. Only the normal force met the conditions of phase synchronization for all successfully completed pre- and post-block grasping trials. The probability of synchronization with larger time lags (τ> 0.1 s) increased after nerve block. The percentage of trials that the thumb led the index finger increased from 52% (pre-block) to 86% (post-block).ConclusionsNerve block caused more deterministic structures in force, torque and COP when the thumb interacted with the index finger. A compensatory mechanism may be responsible for this change. Phase synchronization between the opposite normal forces exerted by the thumb and index finger would be an essential dynamical principle for a precision grip. The nerve block resulted in an increased interdigit phase delay and increased probability that the thumb leads the index finger. The CRQA provides an effective tool to examine interdigit coordination during precision grip and has the potential for clinical evaluation of hand dysfunction.
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2
作者：
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影响因子：
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