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SummaryThis study is aimed at examining body sway factors for 1,107 healthy people aged fifteen to 69 and to propose a practical body sway evaluation method. The center of foot pressure measurement was carried out twice for one minute with a 1 minute rest.Thirty parameters with high reliability selected from six domains (distance, distribution of amplitude, area, velocity, power spectrum, and body sway vector) were summarized objectively into four body sway factors (unit time sway, front-back sway, left-right sway, and high frequency band power). Factor scores were calculated by the estimate equation and the total scores of parameters with high factor loadings. Considering this result, a total score for each factor was classified into four percentile categoris based on percentile rank. Using this classification criteria, body sway scores for each individual were classified into any of the above four percentile categoris for each factor. It was confirmed that young adults mainly belong to percentile categoris A and B and the elderly mainly belong to percentile categoris C and D. It was found that a great effect on body sway occurred when an individual's conscious condition changed (contracting a cold or after exercise). In conclusion, the body sway of healthy people can be explained by these four sway factors. An evaluation of the body sway pattern using the four sway factors may enable us to concretely understand individuals' disorders and abnormal states in addition to changes in body sway that occur with aging.

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