PURPOSE:Regular moderate-to-vigorous physical activity increases life expectancy if accumulated in bouts of at least 10 minutes each (MVPA10) (ACSM, 2013). However, nearly half of older adults did not comply with this prescription (Davis, 2007). Leisure time physical activity (PA), in healthy adults across a broad age range, seems to be a relatively minor independent contributor to aerobic capacity (Talbot, 2000) but in this study differences between overall moderate-tovigorous PA (MVPA) and MVPA10 were not considered. Therefore, the aim of this study was to compare the effects of physical activity performed in bouts (≥10 minutes) to the effects of physical activity spent in nonbouts (