Wobble-board dynamics as a scalable assay of long-latency reflex function in aging

for either measure, nor the number of cycles per trial. By contrast, older adults showed substantially larger peak angular excursions and higher root mean square (RMS) peak angular excursions than younger adults. Multivariate analyses (principal components and canonical correlations) revealed that wobble-board metrics capture variance not explained by center-of-pressure and center-of-mass measures, yielding distinct signatures differentiating individuals, conditions, and-via amplitude metrics-age groups. These results indicate that wobble-board dynamics in aging primarily differ in amplitude rather than in temporal organization or cadence of corrections. This pattern suggests that the timing of corrective responses remains intact with aging, while their effectiveness is reduced. These findings support wobble-board dynamics as a promising paradigm for assessing age-related changes in balance control. Direct validation using electromyography (EMG) and controlled perturbations is warranted to confirm that wobble-board metrics reflect long-latency reflex function.