- <Original Investigations> Postural control with external perturbation on an unstable support surface : Effect of disturbance magnitude and predictability
This study investigated the effects of the magnitude and prediction of disturbance on postural control with external perturbation on an unstable support surface. The participants were asked to stand on a balance board, and control their standing posture in response to a given disturbance. After the participants stabilized on the balance board, loads were placed on both ends of the board from behind. After that, the right load was removed at the timing of auditory stimulation. Different load weights (1.2kg, 2.5kg) and conditions, known (the participants know which weight of the two loads would be removed) and unknown (the participants did not know which weight of the two loads would be removed) were used to vary the degree of instability and prediction. The angle of the balance board, the variation of the center of pressure, and the angles of the shoulder, hip, and knee lines in the frontal plane were analyzed. As a result, the success rate was significantly lower in the heavy task than in the light task, regardless of prediction. The angle of the balance board and center of pressure showed greater variabilities in the heavy task than in the light task, with or without prediction. Furthermore, the angle of the knee line was significantly smaller in participants with high success rates than those with low success rates. These results suggest that control is more difficult for large perturbations and the effect of anticipatory postural adjustment may be suppressed in an unstable support surface. In addition, a strategy to reduce the angular variation of the knee was shown to be effective.
- 奈良女子大学スポーツ科学研究 (ISSN 2434-0200)
奈良女子大学スポーツ科学研究 (ISSN 2434-0200) 22 (2), 1-11, 2021-02-15