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[Purpose] We verified the relationship between single-leg standing and step exercise using center of gravity (COG) sway. [Subjects] The subjects were 10 healthy adults. [Methods] We measured the COG sway of the leading leg in step exercise and single-leg standing. We examined the directional characteristics, velocity and position of COG sway, and determined their relationships with task time using Pearson correlation coefficients. [Results] For the characteristics of the COG sway of stepping up and down, the positional vector plot shows a mediolateral distribution, and the velocity plot a trend of anteroposterior and lateral spread. Furthermore, the positional vector plot of single-leg standing shows a distribution in the medial direction, and the velocity plot mainly a lateral distribution. In addition, a strong positive correlation in lateral COG sway was found between single-leg standing and step exercise. [Conclusion] Our results suggest that sway in the lateral direction counterbalances medial COG sway, and that stepping down and single-leg standing tasks are correlated through lateral COG sway.

The Relationship of Step Exercise with Single-leg Standing from the Perspective of Center of Gravity Sway