Abstract：
BACKGROUND: Poor postural control has been reported in people with Parkinson\'s disease, which could be explained by the changes in muscular activation patterns related to antigravitational muscles. This study aims to measure the muscle activation of antigravitational muscles during balance tasks in individuals, with and without Parkinson\'s.
METHODS: Sixteen (16) participants (9 with Parkinson\'s), aged ≥65 yrs., performed 2 × 30-s trials of 4 balance tasks (bipodal and semi-tandem opened eyes and closed eyes) on a force platform (center of pressure measurement); while surface electromyography measurements were obtained bilaterally on the multifidus at L5, biceps femoris and medialis gastrocnemius. Electromyography amplitude analysis was processed by the Root Mean Square (250 ms window epochs) and normalized by the peak of activation during the balance task, to determine each muscle\'s activity level.
RESULTS: The Parkinson\'s group reported lower muscle activation than control across tasks (in mean for multifidus = 8%, biceps femoris = 16%, gastrocnemius = 7%), although not statistically significant. Parkinson\'s reported significantly poorer postural control than control, mainly for the center of pressure sway ellipse area (p = 0.016) from challenge balance tasks such as semi-tandem.
CONCLUSIONS: Poor postural control was confirmed in the Parkinson\'s group, but not significantly associated by the changes from muscle activation of trunk and lower limbs, during balance performance.
METHODS: Sixteen (16) participants (9 with Parkinson\'s), aged ≥65 yrs., performed 2 × 30-s trials of 4 balance tasks (bipodal and semi-tandem opened eyes and closed eyes) on a force platform (center of pressure measurement); while surface electromyography measurements were obtained bilaterally on the multifidus at L5, biceps femoris and medialis gastrocnemius. Electromyography amplitude analysis was processed by the Root Mean Square (250 ms window epochs) and normalized by the peak of activation during the balance task, to determine each muscle\'s activity level.
RESULTS: The Parkinson\'s group reported lower muscle activation than control across tasks (in mean for multifidus = 8%, biceps femoris = 16%, gastrocnemius = 7%), although not statistically significant. Parkinson\'s reported significantly poorer postural control than control, mainly for the center of pressure sway ellipse area (p = 0.016) from challenge balance tasks such as semi-tandem.
CONCLUSIONS: Poor postural control was confirmed in the Parkinson\'s group, but not significantly associated by the changes from muscle activation of trunk and lower limbs, during balance performance.
摘要：
背景：据报道，帕金森病患者的姿势控制不佳，这可以通过与反重力肌肉相关的肌肉激活模式的变化来解释。这项研究旨在测量在个人平衡任务期间反重力肌肉的肌肉激活，有和没有帕金森氏症。
方法：十六（16）名参与者（9名帕金森氏症患者），年龄≥65岁。,在力平台（压力测量中心）上进行了4次平衡任务（双足和半串联睁眼和闭眼）的2×30-s试验；而在L5，股二头肌和腓肠肌上获得了双侧表面肌电图测量。肌电图振幅分析通过均方根（250ms窗口期）进行处理，并通过平衡任务期间的激活峰值进行归一化。来确定每个肌肉的活动水平。
结果：帕金森氏症组报告说，在不同任务中，肌肉激活低于对照组（多裂的平均值=8％，股二头肌=16%,腓肠肌=7%)，虽然没有统计学意义。帕金森氏症报告的姿势控制明显比对照组差，主要为中心摇摆椭圆区域（p=0.016）的压力来自半串联等挑战平衡任务。
结论：在帕金森组中证实姿势控制不佳，但与躯干和下肢肌肉激活的变化无关，在平衡性能期间。
方法：十六（16）名参与者（9名帕金森氏症患者），年龄≥65岁。,在力平台（压力测量中心）上进行了4次平衡任务（双足和半串联睁眼和闭眼）的2×30-s试验；而在L5，股二头肌和腓肠肌上获得了双侧表面肌电图测量。肌电图振幅分析通过均方根（250ms窗口期）进行处理，并通过平衡任务期间的激活峰值进行归一化。来确定每个肌肉的活动水平。
结果：帕金森氏症组报告说，在不同任务中，肌肉激活低于对照组（多裂的平均值=8％，股二头肌=16%,腓肠肌=7%)，虽然没有统计学意义。帕金森氏症报告的姿势控制明显比对照组差，主要为中心摇摆椭圆区域（p=0.016）的压力来自半串联等挑战平衡任务。
结论：在帕金森组中证实姿势控制不佳，但与躯干和下肢肌肉激活的变化无关，在平衡性能期间。
