Oba Naoko, Sasagawa Shun, Yamamoto Akio, Nakazawa Kimitaka
Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan; Research Institute of Physical Fitness, Japan Women's College of Physical Education, Kita-karasuyama, Setagaya-ku, Tokyo, Japan.
Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan.
PLoS One. 2015 Oct 8;10(10):e0140235. doi: 10.1371/journal.pone.0140235. eCollection 2015.
The development of upright postural control has often been investigated using time series of center of foot pressure (COP), which is proportional to the ankle joint torque (i.e., the motor output of a single joint). However, the center of body mass acceleration (COMacc), which can reflect joint motions throughout the body as well as multi-joint coordination, is useful for the assessment of the postural control strategy at the whole-body level. The purpose of the present study was to investigate children's postural control during quiet standing by using the COMacc. Ten healthy children and 15 healthy young adults were instructed to stand upright quietly on a force platform with their eyes open or closed. The COMacc as well as the COP in the anterior-posterior direction was obtained from ground reaction force measurement. We found that both the COMacc and COP could clearly distinguish the difference between age groups and visual conditions. We also found that the sway frequency of COMacc in children was higher than that in adults, for which differences in biomechanical and/or neural factors between age groups may be responsible. Our results imply that the COMacc can be an alternative force platform measure for assessing developmental changes in upright postural control.
直立姿势控制的发展通常通过足底压力中心（COP）的时间序列来研究，该序列与踝关节扭矩（即单个关节的运动输出）成正比。然而，身体质量加速度中心（COMacc）可以反映全身的关节运动以及多关节协调，对于评估全身水平的姿势控制策略很有用。本研究的目的是通过使用COMacc来研究儿童安静站立时的姿势控制。10名健康儿童和15名健康年轻人被要求在测力平台上睁眼或闭眼安静站立。通过地面反作用力测量获得COMacc以及前后方向的COP。我们发现COMacc和COP都能清楚地区分年龄组和视觉条件之间的差异。我们还发现儿童COMacc的摆动频率高于成人，这可能是由于年龄组之间生物力学和/或神经因素的差异所致。我们的结果表明，COMacc可以作为评估直立姿势控制发育变化的另一种测力平台测量方法。
