Comparing different accelerometer cut-points for sedentary time in children.
Actigraph accelerometers are hypothesized to be valid measurements for assessing children's sedentary time. However, there is considerable variation in accelerometer cut-points used. Therefore, we compared the most common accelerometer sedentary cut-points of children performing sedentary behaviors. Actigraph Actitrainer uniaxial accelerometers were used to measure children's activity intensity (29 children, 5-11 years old) during different activities, namely playing computer games, nonelectronic sedentary games, watching television and playing outdoors. A structured protocol was the criterion for assessing the validity of four common cut-points (100, 300, 800, 1100 counts/minute). The median counts during all sedentary behaviors were below the lowest comparison cut-point of 100 cpm. The 75th percentile values for the sedentary behaviors were always below the cut-point of 300 cpm. Our results suggest that the cut-point of <100 cpm is the most appropriate.
EMGO Institute for Health and Care Research and Dept of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands.
Claudia
C
Fischer
Mine
M
Yıldırım
Jo
J
Salmon
J M
JM
Chinapaw M
D000054:Acceleration; D056044:Actigraphy / Q000379:methods*; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005260:Female; D015438:Health Behavior; D006801:Humans; D007899:Leisure Activities; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D057185:Sedentary Behavior; D013995:Time