Feasibility of using the Tritrac motion sensor over a 7-day trial with older children

This study assessed the feasibility of the Tritrac-R3D motion sensor over a 7-day period with 79 children in Grades 4-8. Eight sets of data were lost due to instrument breakdown or data downloading software problems. Despite daily telephone reminders and school visits, most participants reported problems with wearing the motion sensors, including forgetting to put the sensor on, physical discomfort, involvement in aquatics, public embarrassment, and not being allowed to wear the sensors during organized sport. The results also showed that the Tritrac scores were strongly correlated with Caltrac scores (r =.86) but were not significantly correlated to a 7-day interview recall (PAR) and a 7-day self-report of activity (PAQ-C), The two self-report measures were moderately related. These findings question the viability of the Tritrac to assess typical physical activity over extended periods in this population.