Browsing by Author "Webster, Michael Dean"

Now showing 1 - 1 of 1

Reliably measuring habitual free-living physical activity with the Actical® activity monitor
(Montana State University - Bozeman, College of Education, Health & Human Development, 2007) Webster, Michael Dean; Chairperson, Graduate Committee: Daniel P. Heil
The purpose of this study was to compare reliability measures between a hip- and wrist-worn Actical® accelerometer. A group of 40 (25 female, 15 male) Montana State University employees wore both monitors for 14 consecutive days. Intraclass correlation coefficients (ICC) were determined for three variables for each monitor wearing location for bouts of one, three, five, eight and ten consecutive minutes over the entire monitoring period and for each single day of monitoring. The three dependent variables were the raw activity count values (CNTMV, counts/day) at or above specified moderate intensity activity thresholds, and the corresponding summation of total time (TMV, mins/day) and activity energy expenditure (AEEMV, kcals/day) spent at or above a moderate intensity. As time bouts increased from one to ten minutes, ICC values decreased for both the hipand wrist-worn monitors. The number of days for the hip-worn monitor to reach an ICC of 0.80 ranged from 3 to 4, 2 to 5, and 3 to 6 for CNTMV, AEEMV, and TMV, respectively, while the wrist-worn monitor took 10 to 12, 5 to 8, and 3 to 5 days for the same respective variables.