title: Reliability and validity of the tritrac-R3D accelerometer during backpacking: a case study.
abstract: This study investigated the utility of the Tritrac-R3D accelerometer as a reliable and valid instrument in the quantification of physical activity while backpacking in the field and to evaluate heart-rate responses and oxygen consumption to assess the feasibility of using the Tritrac-R3D to estimate caloric expenditure. Two 7-day backpacking expeditions were conducted in two consecutive years by a single subject at Grand Canyon National Park, Arizona. The average hiking heart rate ranged front 60% to 77% HRmax during the expeditions. The average rate of estimated caloric cost ranged from 6.8 to 11.7 kcals x min.(-1) (equivalent to 408 to 702 kcals x hr.(-1)), indicating a relatively moderate to high level of exertion. The Tritrac had adequate consistency and reliability in the field between the two expeditions in recorded activity counts. The Tritrac underestimated caloric expenditure during backpacking with changes in terrain, and hiking speed contributed to even greater disparity in accuracy.
authors.affiliation: Department of Health and Exercise Science, Colorado State University, Fort Collins 80523, USA. devoe@cahs.colostate.edu
authors.forename: D
authors.initials: D
authors.lastname: DeVoe
authors.forename: L
authors.initials: L
authors.lastname: Dalleck
mesh_terms: D000328:Adult; D004734:Energy Metabolism / Q000502:physiology; D005080:Exercise Test / Q000295:instrumentation; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation; D009043:Motor Activity / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D015203:Reproducibility of Results