Comparison of Accelerometer-Based Cut-Points for Children’s Physical Activity: Counts vs. Steps

Children

KimberlyA. Clevenger¹  MoiraA. Ragan²  CherylA. Howe³  RyannE. Leslie³ 

[1] Department of Kinesiology, Michigan State University, East Lansing, MI 48824, USA;Gladys W. and David H. Patton College of Education, Ohio University, Athens, OH 45701, USA;School of Applied Health Sciences and Wellness, Ohio University, 1 University Terrace, Grover Center E154, Athens, OH 45701, USA;

关键词: pediatric;    accelerometry;    cadence;    step rate;    energy expenditure;    free-play;   

DOI  :  10.3390/children5080105

来源: DOAJ

【 摘 要 】

Background: Accelerometers measure complex movements of children’s free play moderate-vigorous physical activity (MVPA), including step and non-step movements. Current accelerometer technology has introduced algorithms to measure steps, along with counts. Precise interpretation of accelerometer-based cadence (steps/min) cut-points is necessary for accurately measuring and tracking children’s MVPA. The purpose of this study was to assess the relationships and agreement between accelerometer-based cut-points (cadence and counts/min) to estimate children’s MVPA compared to measured values. Methods: Forty children (8–12 years; 25 boys) played 6–10 games while wearing a portable metabolic analyzer and GT3X+ to measure and estimate MVPA, respectively. Correlation, kappa, sensitivity, and specificity assessed the relationships and agreement between measured and estimated MVPA. Results: Games elicited, on average, 6.3 ± 1.6 METs, 64.5 ± 24.7 steps/min, and 3318 ± 1262 vertical (V) and 5350 ± 1547 vector-magnitude (VM) counts/min. The relationship between measured and estimated MVPA intensity was higher for cadence (r = 0.50) than V and VM counts/min (r = 0.38 for both). Agreement using V and VM counts/min for measuring PA intensity varied by cut-points (range: 6.8% (κ = −0.02) to 97.6% (κ = 0.49)), while agreement was low using cadence cut-points (range: 4.0% (κ = 0.0009) to 11.3% (κ = 0.001)). Conclusion: While measured and estimated values were well correlated, using cadence tended to misclassify children’s free-play MVPA.

【 授权许可】

Unknown