Accelerometer Methodology: Issues with Attachment Style at the Waist -

Objective: Investigate differences in ActiGraph GT9X vertical axis counts (VAC) and step counts clipped onto the waistband at the hip compared to the 3 methods of attachment at the traditional waist placement. Methods: Three laboratory-based treadmill test conditions were utilized: 1) 3 mph in blue jeans; 2): 3 mph in athletic shorts; and 3): 6 mph in athletic shorts. Three monitors were attached in different methods to the traditional elastic belt (2 threaded options and 1 clipped) and one accelerometer was clipped onto waistband at the hip. Results: No differences were observed between attachment methods for step counts in any test condition (p >.05). When considering physical activity intensity classification accuracy, all attachment methods (100% of the time) generated counts within the same intensity category. Conclusion: Clipping the accelerometer to the waistband produces comparable data to that of the elastic belt (within any threading configuration) and may reduce participant burden.