This study investigated the effects of diabetes mellitus (DM) on dynamical coordination of hand intrinsic muscles during precision grip. Precision grip was tested using a custom designed apparatus with stable and unstable loads, during which the surface electromyographic (sEMG) signals of the abductor pollicis brevis (APB) and first dorsal interosseous (FDI) were recorded simultaneously. Recurrence quantification analysis (RQA) was applied to quantify the dynamical structure of sEMG signals of the APB and FDI; and cross recurrence quantification analysis (CRQA) was used to assess the intermuscular coupling between the two intrinsic muscles. This study revealed that the DM altered the dynamical structure of muscle activation for the FDI and the dynamical intermuscular coordination between the APB and FDI during precision grip. A reinforced feedforward mechanism that compensates the loss of sensory feedbacks in DM may be responsible for the stronger intermuscular coupling between the APB and FDI muscles. Sensory deficits in DM remarkably decreased the capacity of online motor adjustment based on sensory feedback, rendering a lower adaptability to the uncertainty of environment. This study shed light on inherent dynamical properties underlying the intrinsic muscle activation and intermuscular coordination for precision grip and the effects of DM on hand sensorimotor function.

中文翻译：

---

糖尿病患者手内在肌肉对精确抓地力的动态协调。

这项研究调查了糖尿病（DM）对精确抓握过程中手内在肌肉的动态协调的影响。使用具有稳定和不稳定负载的定制设计的设备对精确抓地力进行了测试，在此期间，同时记录了外展性短足外展肌（APB）和第一背骨间（FDI）的表面肌电图（sEMG）信号。应用递归量化分析（RQA）量化APB和FDI的sEMG信号的动态结构。交叉重复定量分析（CRQA）用于评估两个内在肌肉之间的肌肉间耦合。这项研究表明，在精确抓握过程中，DM改变了FDI的肌肉激活动力学结构以及APB和FDI之间的肌肉间动态协调关系。补偿DM中感觉反馈损失的强化前馈机制可能是APB和FDI肌肉之间更强的肌肉间耦合的原因。DM中的感官缺陷明显降低了基于感官反馈的在线运动调节能力，从而降低了对环境不确定性的适应性。这项研究揭示了固有的动力学特性，这些固有的动力学特性是固有的肌肉激活和肌肉间协调作用的基础，以实现精确的抓地力以及DM对手感觉运动功能的影响。降低了对环境不确定性的适应性。这项研究揭示了固有的动力学特性，这些固有的动力学特性是固有的肌肉激活和肌肉间协调作用的基础，以实现精确的抓地力以及DM对手感觉运动功能的影响。降低了对环境不确定性的适应性。这项研究揭示了固有的动力学特性，这些固有的动力学特性是固有的肌肉激活和肌肉间协调的基础，以实现精确的抓地力以及DM对手感觉运动功能的影响。