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Background: The vertical acceleration (Vacc) parameter in sit-to-stand movement (STS) are useful for measuring lower-limb function in older adults. However few reports are available on whether Vacc parameter in STS movement reflect lower-limb functional status in older adults. Purpose: To investigate the concurrent validity of Vacc parameter in STS for assessing lower-limb function. Methods: A total of 399 older adults participated in a cross sectional study. Participants performed the STS with a 3-axis accelerometer attached to the lower back first and then holding in their hand. Two parameters were measured: maximal acceleration, maximal jerk. Objective assessment such as vertical ground reaction force, timed up and go test (TUG), 5-time sit-to-stand test, 5-m habitual walk, one-leg balance with eyes open were used to assess lower-limb function. Subjective assessment such as history of falls, fear of falling and mobility limitation were examined. Concurrent validity was evaluated using Pearson correlation coefficient (r) and analysis of covariance adjusted for the age and sex and Trend test (Jonckheele-Terpstra). Results: Lower back maximal acceleration was relatively higher correlated with RFD8.75/w (r = 0.75), TUG and 5-time sit-to-stand (r = -0.45 ~ -0.54). Lower back maximal acceleration was tend to small in subjects reporting falls, a fear of falling or a mobility limitation compared to those who didn���t report it. Conclusions: Lower back maximal acceleration can be a valid parameter for the quantification of the lower-limb function in older adults., The Health & Fitness Journal of Canada, Vol. 14 No. 3 (2021): Proceedings from the 8th International Society for Physical Activity and Health Congress