Open AccessSources of variance and reliability of objectively monitored physical activity in rural and urban Northern Sotho-speaking blacks
Author(s) -
I Cook,
Estelle V. Lambert
Publication year - 2009
Publication title -
south african journal of sports medicine
Language(s) - English
Resource type - Journals
eISSN - 2078-516X
pISSN - 1015-5163
DOI - 10.17159/2413-3108/2008/v20i1a288
Subject(s) - reliability (semiconductor) , physical activity , variance (accounting) , demography , sample (material) , medicine , gerontology , physical therapy , geography , statistics , mathematics , sociology , accounting , chromatography , power (physics) , chemistry , physics , quantum mechanics , business
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 (