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

Journal of Physiological Anthropology

Katsuo Fujiwara²  Takeo Kiyota¹ 

[1] Department of Psychology, Faculty of Humanities, Sapporo International University, 4-1-4-1 Kiyota, Kiyota-ku, Sapporo 004-8602, Japan;Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8640, Japan

关键词: Static balance;    Single-leg stance;    Lateral dominance;    Dynamic balance;   

Others  :  1133127
DOI  :  10.1186/1880-6805-33-25

 received in 2014-03-28, accepted in 2014-07-23,  发布年份 2014

【 摘 要 】

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 (CoP_ap) was calculated as an index of postural stability, and frequency analysis of CoP_ap sway was performed. Footedness for carrying out mobilizing activities was assessed with a questionnaire.

Results

CoP_ap speed exponentially increased as oscillation frequency increased in both legs. The frequency analysis of CoP_ap showed a peak <0.3 Hz at no oscillation. The frequency components at 0.25-Hz oscillation included common components with no oscillation and those at 1.5-Hz oscillation showed the maximum amplitude among all conditions. Postural stability showed no significant difference between left- and right-leg stance at no oscillation and oscillations ≤1.25 Hz, but at 1.5-Hz oscillation was significantly higher in the right-leg stance than in the left-leg stance. For the lateral dominance of postural stability at individual levels, the lateral difference in postural stability at no oscillation was positively correlated with that at 0.25-Hz oscillation (r = 0.51) 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.

【 授权许可】

   
2014 Kiyota and Fujiwara; licensee BioMed Central Ltd.

【 图 表 】

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