Błażkiewicz Michalina
Józef Piłsudski University of Physical Education, Warsaw, Poland.
Acta Bioeng Biomech. 2020;22(4):15-21.
Yoga is known as a type of exercise that combines physical, mental and spiritual aspects. There has not been much research on the postural control in various yoga poses. The aim of this study was to examine CoP regularity in both yoga instructors and novices during the performance of four yoga poses, and to verify the sensitivity of linear and nonlinear methods for assessing postural stability.
The dynamic characteristics of CoP fluctuations were examined using linear and nonlinear methods on a group of 22 yoga instructors (Y) and 18 age-matched non-practitioners of yoga (NY). The study involved maintaining a balance for 20 seconds while performing four yoga poses.
Conventional analysis of CoP trajectories showed that NY and Y exhibited similar control of postural sway, as indicated by similar CoP path-length and area values observed in both groups. These results suggest that the special balance yoga training received by Y may not have an impact on less challenging balance conditions, such as the poses used in this experiment. Interestingly, nonlinear dynamical analysis of CoP showed that Y exhibited less CoP regularity and more complex signal than NY, as evidenced by higher values of sample entropy and fractal dimension.
The results shed light on the surplus values of CoP trajectories in the nonlinear dynamical analysis to gain further insight into the mechanisms involved in posture control.
瑜伽是一种融合了身体、心理和精神层面的运动。关于各种瑜伽姿势下的姿势控制，此前的研究并不多。本研究的目的是检查瑜伽教练和新手在进行四种瑜伽姿势时的重心（CoP）规律，并验证线性和非线性方法评估姿势稳定性的敏感性。
使用线性和非线性方法，对一组22名瑜伽教练（Y组）和18名年龄匹配的非瑜伽练习者（NY组）的CoP波动动态特征进行了检查。该研究要求在进行四种瑜伽姿势时保持20秒的平衡。
CoP轨迹的传统分析表明，NY组和Y组在姿势摆动控制方面表现相似，两组观察到的CoP路径长度和面积值相似。这些结果表明，Y组接受的特殊平衡瑜伽训练可能对难度较低的平衡条件没有影响，比如本实验中使用的姿势。有趣的是，CoP的非线性动力学分析表明，Y组的CoP规律性低于NY组，信号更复杂，样本熵和分形维数更高证明了这一点。
研究结果揭示了CoP轨迹在非线性动力学分析中的额外价值，有助于进一步深入了解姿势控制所涉及的机制。
