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Updated: Jun 14, 2026
Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
Published on: August 30, 2016
Cortical rhythms associated with early postural stabilization during the transition from the double-leg to the
Yuji Nishioka1, Yoshiki Tanaka2, Nobuhiro Kito3
1Graduate School of Medical Science, Hiroshima International University, Hiroshima, Japan.
Objective:
Previous studies have demonstrated that the cerebral cortex is involved in the postural responses to static standing and disturbances. However, the role of the cortex in postural stabilization remains unclear. This study aimed to clarify cortical activity during postural stabilization.
Methods:
Thirteen healthy adult subjects performed a transition from the double-leg stance to the single-leg stance. The tasks were classified as -1-0 s (T1) to 3-4 s (T5), and the relationship between the power spectrum of the alpha and beta bands of the electroencephalogram (EEG) and the center of pressure (COP) or time to stabilization (TTS) was examined. The subjects were also divided into the low-TTS and high-TTS groups based on TTS, and EEG findings were compared between groups.
Results:
While COP parameters showed no significant correlation with EEG findings, TTS shortening was associated with a decrease in the alpha power at T2 (0-1 s) and an increase in the beta power at T5. Low-TTS group also showed a decrease in the alpha power compared with high-TTS group. Furthermore, low-TTS group showed an increase in beta power at T5 compared with T1, and high-TTS group showed a decrease in beta power at T5 compared with T3 (1-2 s).
Conclusion:
Our findings indicate that the cerebral cortex contributes to faster postural stabilization. Furthermore, the results suggest that the decrease in alpha power is the cortical activity that stabilizes the posture, and the increase in beta power is the cortical activity that maintains a stable posture.
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