Accelerometer outputs as determined using three different epoch lengths. Each illustration shows the MET values from 14:00 to 14:30 in one of the participants. The upper, middle and lower illustrations indicate the MET values determined by the epoch lengths of 4, 20 and 60 seconds, respectively. For the epoch length of 4 seconds, no PA bouts lasting > 10 minutes were detected. For the epoch length of 20 seconds, one PA bout lasting > 10 minutes was detected (14:03 to 14:15). For the epoch length of 60 seconds, one MVPA bout lasting > 10 minutes was detected (14:03 to 14:15).
Ayabe et al. BMC Research Notes 2013 6:20 doi:10.1186/1756-0500-6-20