脳卒中片麻痺患者における腕の加重に対する適応的運動計画

抄録

Healthy participants can adaptively modulate their trajectory height to reduce possible disturbance to the movement when signal dependent noises increase. We aimed to clarify whether such an adaptive trajectory planning ability is preserved in hemiplegia patients, who showed decreased motor skills because of brain injury, and analyzed reaching kinematics with or without a 200 g weight. We hypothesized that patients would adjust their trajectory in simple reaching movements to compensate the lack of motor control accuracy due to their symptoms. The results show that patients’ trajectories with a weight were higher than those without a weight in affected hands. Moreover, in the 200 g weight condition, even higher trajectory was observed in the second block compared to the first block. These results suggest that hemiplegia patients can plan an adaptive trajectory, considering their movement accuracy, task requirements, and increased effects of motor noises due to muscle fatigue. We also replicated the results of the previous study using healthy participants, which are explained by the same mechanism considering motor noises and task requirements.