Older adults walked with a larger step width, resulting in a large stability margin in the ML direction, although with increased moment and momentum around the center of mass in the frontal plane. Our findings provide new insights for understanding the effects of age on dynamic balance and the relationships between the metrics. The ML peak-to-peak range of H positively correlated with ML dCOP–mCOP across the adult lifespan.
ML MOS positively correlated with the frontal peak-to-peak range of H. Age-related differences in dynamic measures were found in the ML direction and not in the AP direction: MOS, peak-to-peak range of H, and dCOP–mCOP in the old group were greater than in the young group. The step width of the old group was higher than that of the young group. Participants were divided into three groups: young, middle-aged, and old. We used the kinetic and kinematic data of 151 participants aged 20–77 years from a publicly available database. In this study, we aimed to discover (1) the effects of age on dynamic balance measures, including the margin of stability (MOS), whole-body angular momentum ( H), and misalignment of the desired and measured centers of pressure (dCOP and mCOP, respectively) in the anteroposterior (AP) and mediolateral (ML) directions, (2) the relationship between gait parameters and these balance measures, and (3) the relationships between these balance measures.
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