Taking Food to Mouth: Correlation Between Repetitive Movement and Upper Limb Flexion Synergy After Stroke.

BackgroundPathological upper-limb synergistic movement is a prevalent symptom of post-stroke motor dysfunction and pose a significant challenge in the rehabilitation of hemiplegia. However, the underlying mechanisms remain elusive, hindering the development of effective therapeutic strategies.ObjectiveThis study aims to explore the mechanisms underlying pathological synergic movements post-stroke by examining the interrelationship between motor modules associated with upper limb flexion synergy and the repetitive action of "taking food to the mouth.

The Muscle Activation Differences in Post-Stroke Upper Limb Flexion Synergy Based on Spinal Cord Segments: A Preliminary Proof-of-Concept Study.

This study examined the activation difference of muscles innervated by cervical cord 5-6 (C5-C6) and cervical cord 8- thoracic cord 1 (C8-T1) in upper limb flexion synergy after stroke. Surface electromyography (sEMG) signals were collected during elbow flexion in stroke patients and healthy controls. The study compared normalized activation of two pairs of muscles that could cause similar joint movement but which dominated different spinal cord segments (clavicular part of the pectoralis major, PC vs.

Cortical excitability signatures for the degree of sleepiness in human.

Sleep is essential in maintaining physiological homeostasis in the brain. While the underlying mechanism is not fully understood, a 'synaptic homeostasis' theory has been proposed that synapses continue to strengthen during awake and undergo downscaling during sleep. This theory predicts that brain excitability increases with sleepiness.

Differential Changed Excitability of Spinal Motor Neurons Innervating Tibialis Anterior and Peroneus Muscles Cause Foot Inversion After Stroke.

To study differential post-stroke changes of excitability of spinal motor neurons innervating a group of antagonist muscles of ankle and their effects on foot inversion. F waves in tibialis anterior (TA) and peroneus muscles (PN) were recorded. The condition of spasticity and foot inversion in stroke patients were also evaluated.