Correlation and wear-time compliance of the wrist-worn SQORD Activity Monitor compared to the Actigraph 3TGX in measuring free-living physical activity in low SES elementary youth
Background and Purpose: Activity trackers have grown increasingly popular, yet research grade accelerometers, like Actigraph, are still very expensive and must be worn on the waist. This study correlated the low-cost wrist-worn SQORD band to the Actigraph accelerometer to assess physical activity (PA) in youth from a low-income area. Methods: Forty-one participants (22:19 male:female; mean age= 10.7 years) in an after-school program participated. Participants wore a waist-worn Actigraph accelerometer and a wrist-worn SQORD for seven days. Abdominal, upper and lower body strength and endurance, and aerobic capacity were assessed through FITNESSGRAM tests. Bivariate correlations were used to analyze the relationship between moderate-to-vigorous PA (MVPA) via the Actigraph and SQORD and to examine relationships between physical fitness and MVPA. Results: At 8- and 10-hour wear-time, compliance with wearing the devices was higher with the SQORD than the Actigraph. A correlation was found between MVPA via SQORD and Actigraph (r=0.651). Neither the SQORD or Actigraph was associated with any fitness measures (r = -0.061; – 0.817). Conclusion: The SQORD appears to be successful in tracking MVPA in youth and was worn more than the Actigraph. Wrist-worn, consumer-grade devices may be a cost-effective alternative to traditional accelerometers for physical education programs and research in low-income populations.
Copyright (c) 2019 Kelsey McAlister, Koren Fisher, Kathleen Wilson, Risto Marttinen
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