Boumer Tatiane Caroline, Martello Suzane Ketlyn, Devetak Gisele Francini, Iucksch Dielise Debona, Scrok Nicoly Dominique, Manffra Elisangela Ferretti
Pontifícia Universidade Católica do Paraná, Health Technology Graduate Program, Rua Imaculada Conceição, 1155, Curitiba, 80215-901, Brazil.
Universidade Federal do Paraná, Physical Education Graduate Program, Avenida Prefeito Lothario Massner, 632, Curitiba, 80210-170, Brazil.
Gait Posture. 2018 Oct;66:58-62. doi: 10.1016/j.gaitpost.2018.07.182. Epub 2018 Aug 9.
Foot placement is an important methodological parameter in experiments for analyzing the behavior of the center of pressure (CoP) duringquiet standing. In the case of stroke patients, this is a relevant issue, as the standardized position, usually adopted is not ecological.
Do between-limb synchronization, weight-bearing symmetry, and amplitude of the postural sway of post-stroke individuals differ between standardized and comfortable foot positions during quiet standing?
A total of 36 volunteers (20 with stroke and 16 healthy) stood barefoot, for 60 s, on two force plates with feet in a comfortable and standardized position (14° of external rotation and heels 17 cm apart). Three trials were performed in each position, and the average values obtained were analyzed.
The comfortable position adopted by stroke individuals was characterized by heels kept 17 cm apart and with 21° of external rotation. None of the measures of the healthy group were influenced by feet position. In the stroke group, the lag to maximal between-feet correlation in the mediolateral direction (ML ρ lag) was higher (0.45 s) and the weight-bearing symmetry was better in the comfortable (38%) than in the standardized conditions (0.19 s and 32%, respectively). Neither the other CoP measures nor the intra-subject variability was sensitive to feet position.
The assumption that standardization leads to reduced variability might not be valid to the post-stroke and healthy individuals age around 55 years. Therefore, adoption of a comfortable condition might be advantageous, once it allows for a more practical and realistic evaluation of postural control.
在分析安静站立时压力中心（CoP）行为的实验中，足部位置是一个重要的方法学参数。对于中风患者而言，这是一个相关问题，因为通常采用的标准化姿势并不符合实际情况。
安静站立时，中风后个体在标准化足部位置和舒适足部位置之间，其肢体间同步性、负重对称性以及姿势摆动幅度是否存在差异？
共有36名志愿者（20名中风患者和16名健康人）赤足站在两个测力板上60秒，足部处于舒适和标准化位置（外旋14°，脚跟相距17厘米）。每个位置进行三次试验，并对获得的平均值进行分析。
中风个体采用的舒适位置的特点是脚跟相距17厘米，外旋21°。健康组的各项测量指标均不受足部位置影响。在中风组中，舒适位置（38%）的内侧-外侧方向（ML ρ lag）上两脚间最大相关性的延迟更高（0.45秒），负重对称性也优于标准化条件（分别为0.19秒和32%）。其他CoP测量指标和受试者内变异性均对足部位置不敏感。
标准化会导致变异性降低这一假设，对于55岁左右的中风后个体和健康个体可能并不成立。因此，采用舒适条件可能具有优势，因为它能对姿势控制进行更实际、更符合现实的评估。
