
IPEN Adolescent Accelerometer Data Collection Guidelines
Nonwear definition:
Recommendation is 60 minutes of consecutive 0’s to define nonwear time
for all models
Kelli L. Cain, San Diego May 2014
The Coordinating Center conducted a ‘sitting’ study
to determine a sensitive nonwear definition in youth
27 adolescents wore a 7164 and a GT3X+ on the
same belt while sitting watching TV for 90 minutes.
Observers verified participants stayed seated
Data are showing that 100% of sedentary time
during long sitting bouts would be detected with a 60
minute nonwear definition (7164 and GT3X+LFE)
compared to only 89% with 20 minutes and 93% with
30 minutes
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