Leteneur Sébastien, Cremoux Sylvain, Allard Paul, Simoneau-Buessinger Émilie, Farahpour Nader, Barbier Franck
Université Polytechnique Hauts-de-France, UMR 8201 - LAMIH - Laboratoire d'Automatique de Mécanique et d'Informatique Industrielles et Humaines, F-59313 Valenciennes, France; CNRS, UMR 8201, F-59313 Valenciennes, France.
Université Polytechnique Hauts-de-France, UMR 8201 - LAMIH - Laboratoire d'Automatique de Mécanique et d'Informatique Industrielles et Humaines, F-59313 Valenciennes, France; CNRS, UMR 8201, F-59313 Valenciennes, France.
Clin Biomech (Bristol). 2019 Jul;67:180-186. doi: 10.1016/j.clinbiomech.2019.05.012. Epub 2019 May 10.
This study test if the frequency coherence calculated for the overall, low and high frequency bandwidths of the center of pressure excursions and free-moment calculated during standing balance are similar between scoliotic and non-scoliotic girls and if the coherence values within each frequency band are comparable for a given group of girls.
Twenty-nine girls with adolescent idiopathic scoliosis formed the scoliotic group and 22 able-bodied girls formed the non-scoliotic group. Each girl maintained a quiet upright stance on a force plate. Three trials were performed at a sampling frequency of 64 Hz for 64 s. Mean anterio-posterior, medio-lateral center of pressure positions and free-moment were measured and their frequency content calculated. The magnitude of the coherence was calculated for each signal pairs for three frequency ranges.
The magnitude of the medio-lateral center of pressure/free-moment coherence in the low and high frequency bands was significantly different between the groups. Within each group, the magnitude of the medio-lateral center of pressure/free-moment coherence was significantly higher than the other two coherence pairs at low frequencies (P < 0.001). Factor analysis revealed that able-bodied girls exhibited a mixed standing balance modality consisting of posture (center of pressure) and proprioceptive information (free-moment). Scoliotic girls adopted an adaptive modality mostly based on proprioception information to maintain their standing balance.
Scoliotic girls systematically depend on the free-moment to modulate their antero-posterior center of pressure displacements. These results suggest a postural reeducation program aimed at improving proprioception while repositioning the mean center of pressure by postural corrections.
本研究旨在测试在站立平衡期间计算的压力中心偏移和自由力矩的整体、低频和高频带宽的频率相干性在脊柱侧弯和非脊柱侧弯女孩之间是否相似，以及对于给定的一组女孩，每个频带内的相干值是否具有可比性。
29名患有青少年特发性脊柱侧弯的女孩组成脊柱侧弯组，22名身体健康的女孩组成非脊柱侧弯组。每个女孩在测力平台上保持安静直立姿势。以64Hz的采样频率进行64秒的三次试验。测量平均前后、内外侧压力中心位置和自由力矩，并计算其频率成分。计算三个频率范围的每个信号对的相干幅度。
两组之间低频和高频带内的内外侧压力中心/自由力矩相干幅度存在显著差异。在每组中，低频时内外侧压力中心/自由力矩相干幅度显著高于其他两个相干对（P<0.001）。因子分析显示，身体健康的女孩表现出一种由姿势（压力中心）和本体感觉信息（自由力矩）组成的混合站立平衡模式。脊柱侧弯女孩主要采用基于本体感觉信息的适应性模式来维持站立平衡。
脊柱侧弯女孩系统地依赖自由力矩来调节其前后压力中心位移。这些结果表明，一个姿势再教育计划旨在改善本体感觉，同时通过姿势矫正重新定位平均压力中心。
