The Jerzy Kukuczka Academy of Physical Education, Department of Physiotherapy of the Nervous System and the Musculoskeletal System, Katowice, Poland.
The Jerzy Kukuczka Academy of Physical Education, Department of Human Motor Behavior, Katowice, Poland.
PLoS One. 2019 Sep 4;14(9):e0220962. doi: 10.1371/journal.pone.0220962. eCollection 2019.
To determine the impact of body weight on quiet standing postural sway characteristics in young women, this research compared spontaneous oscillations of the center of foot pressure (COP) between 32 obese (BMI: 36.4 ± 5.2 kg/m2), and 26 normal-weight (BMI: 21.4 ± 1.5 kg/m2) women and assessed the influence of obesity treatment and body weight reduction on postural sway. Trajectories of the COP were assessed while the subjects were standing quietly with eyes open (EO) and closed (EC). Both in the sagittal (AP) and frontal (ML) planes the sway range, average velocity, and maximal velocity of COP were calculated. Moreover, the total average and maximal velocities were computed. In the obese group, the tests were performed twice-before and after the obesity treatment. A greater (18% in EC) AP sway range and a substantial reduction of ML sway (25% in EO, 22% in EC) were observed in the obese women. The total COP velocities (average and maximal) were decreased in obese women (20% and 20% in EO) as well as the velocities in the frontal plane (EO: 33%, 41%; EC: 34%, 40%). Body weight reduction resulted in significant changes in postural sway. The following parameters increased: ML sway range (28% in EO), average (20% in EO, 16% in EC) and maximal ML (20% in EO) velocities. The results indicate that young obese women in the habitual standing position are characterized by the destabilizing influence of mass in the sagittal plane only in the absence of a visual control. This effect is dominated by the stabilizing mass effect in the frontal plane, which affects overall postural stability when standing. The reduction of body mass enables a decrease in ML static stability, likely due to natural changes in the base of support while standing.
为了确定体重对年轻女性安静站立姿势摆动特征的影响，本研究比较了 32 名肥胖女性（BMI：36.4±5.2kg/m2）和 26 名正常体重女性（BMI：21.4±1.5kg/m2）的足底压力中心（COP）自发性摆动，评估了肥胖治疗和体重减轻对姿势摆动的影响。在受试者睁眼（EO）和闭眼（EC）时安静站立时评估 COP 轨迹。在矢状面（AP）和额状面（ML）上均计算了 COP 的摆动范围、平均速度和最大速度。此外，还计算了总平均和最大速度。在肥胖组中，在肥胖治疗前后进行了两次测试。肥胖女性的 AP 摆动范围更大（EC 为 18%），ML 摆动明显减少（EO 为 25%，EC 为 22%）。肥胖女性的 COP 总速度（平均和最大）均降低（EO 为 20%和 20%），额状面速度也降低（EO：33%、41%；EC：34%、40%）。体重减轻导致姿势摆动发生显著变化。以下参数增加：ML 摆动范围（EO 为 28%）、平均（EO 为 20%，EC 为 16%）和最大 ML（EO 为 20%）速度。结果表明，在习惯性站立姿势下，年轻肥胖女性仅在没有视觉控制的情况下，在矢状面受到质量的不稳定影响。这种影响主要由额状面的稳定质量效应主导，当站立时会影响整体姿势稳定性。体重减轻可降低 ML 静态稳定性，这可能是由于站立时支撑基础的自然变化。
