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Objectives. We investigated the sources of variance and reliability in an objective measure of physical activity for a 14- hour and 4-day monitoring period. Design. A convenience sample of rural (N=31) and urban (N=30) adult, Northern Sotho-speaking blacks was recruited. Physical activity was assessed for 8 consecutive days using a uni-axial accelerometer. Physical activity indices were total counts, average counts, inactivity (doi:10.17159/2078-516x/2008/v20i1a288 fatcat:qqrqv2no55hi5cl3ugvbx566b4