Article

We evaluated the association of accelerometer-based sedentary
behaviour and physical activity with the risk of cardiovascular disease. Design
The design of this study used a population-based, cross-sectional sample. Methods
A subsample of participants in the Health 2011 Study in Finland used the
tri-axial accelerometer
(>/=4 days, >10 h/day, n = 1398). Sedentary behaviour
(sitting, lying) and standing still in six-second epochs were recognised from raw
acceleration data based on intensity and device orientation. The intensity of
physical activity was calculated as one-minute moving averages of mean amplitude
deviation of resultant acceleration and converted to metabolic equivalents.
Metabolic equivalents were categorised to light physical activity (1.5-2.9
metabolic equivalents) and moderate-to-vigorous physical activity
(moderate-to-vigorous physical activity>/=3.0 metabolic equivalents). Daily
sedentary behaviour, standing still, light physical activity and
moderate-to-vigorous physical activity were expressed as mean daily total time,
accumulated time and number of different bouts (from 30 s to >30 min), mean daily
metabolic equivalent and weekly peak metabolic equivalent levels of different
bout lengths and number of breaks in sedentary behaviour. The ten-year
cardiovascular disease risk was based on the Framingham risk model. Results The
mean number of daily sedentary behaviour bouts was more strongly associated with
cardiovascular disease risk than mean daily total time. In the best model,
smaller waist circumference, greater value of mean daily metabolic equivalent
levels of one-minute bouts, higher accumulated time of moderate-to-vigorous
physical activity lasting 5 min standing bouts and a
higher number of long (>30 min) bouts of light physical activity were
significantly associated with lower cardiovascular disease risk (R2 = 0.836).
Conclusions - The objectively measured number and accumulated time from different
bout lengths of physical activity and sedentary behaviour were associated with
cardiovascular disease risk, which is considered relevant for estimating
cardiovascular diseases and for devising preventive actions.

Langue : ANGLAIS