Dominant side in single-leg stance stability during floor oscillations at various frequencies

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• 作者：Takeo Kiyota ; Katsuo Fujiwara
• 关键词：Dynamic balance ; Lateral dominance ; Single ; leg stance ; Static balance
• 刊名：Journal of Physiological Anthropology
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：33
• 期：1
• 全文大小：588 KB
• 参考文献：1. Grouios, G, Hatzitaki, V, Kollias, N, Koidou, I (2009) Investigating the stabilising and mobilising features of footedness. Laterality 14: pp. 362-380
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• 刊物主题：Human Physiology; Anthropology;
• 出版者：BioMed Central
• ISSN：1880-6805

文摘

Background We investigated lateral dominance in the postural stability of single-leg stance with anteroposterior floor oscillations at various frequencies. Methods Thirty adults maintained a single-leg stance on a force platform for 20?seconds per trial. Trials were performed with no oscillation (static condition) and with anteroposterior floor oscillations (2.5-cm amplitude) at six frequencies: 0.25, 0.5, 0.75, 1.0, 1.25 and 1.5?Hz (dynamic condition). A set of three trials was performed on each leg in each oscillation frequency in random order. The mean speed of the center of pressure in the anteroposterior direction (CoPap) was calculated as an index of postural stability, and frequency analysis of CoPap sway was performed. Footedness for carrying out mobilizing activities was assessed with a questionnaire. Results CoPap speed exponentially increased as oscillation frequency increased in both legs. The frequency analysis of CoPap showed a peak r--.51) and negatively correlated with that at 1.5-Hz oscillation (r--0.53). For 70% of subjects, the dominant side of postural stability was different at no oscillation and 1.5-Hz oscillation. In the subjects with left- or right-side dominance at no oscillation, 94% or 38% changed their dominant side at 1.5-Hz oscillation, with a significant difference between these percentages. In the 1.5-Hz oscillation, 73% of subjects had concordance between the dominant side of postural stability and that of mobilizing footedness. Conclusion In static conditions, there was no lateral dominance of stability during single-leg stance. At 1.5-Hz oscillation, the highest frequency, right-side dominance of postural stability was recognized. Functional role in supporting leg may be divided between left and right legs according to the change of balance condition from static to dynamic.