Wrist Acceleration Cut-points for Moderate-to-Vigorous Physical Activity in Youth.

Purpose: To examine the validity of wrist acceleration cut-points for classifying moderate (MPA), vigorous (VPA) and moderate-to-vigorous (MVPA) physical activity. Methods: Fifty-seven children (5-12y) completed 15 semi-structured activities. Three sets of wrist cut-points (>192mg, >250mg, >314mg), previously developed using Euclidian norm minus one (ENMO192+), GENEActiv software (GENEA250+) and Bandpass Filtered followed by Euclidian Norm (BFEN314+), were evaluated against indirect calorimetry. Analyses included classification accuracy, equivalence testing and Bland-Altman procedures. Results: All cut-points classified MPA, VPA and MVPA with substantial accuracy (ENMO192+: [kappa] = 0.72 [95% confidence interval: 0.72 - 0.73], MVPA: area under the receiver operating characteristic curve (ROC-AUC) = 0.85 [0.85 - 0.86]; GENEA250+: [kappa] = 0.75 [0.74 - 0.76], MVPA: ROC-AUC = 0.85 [0.85 - 0.86]; BFEN314+: [kappa] = 0.73 [0.72 - 0.74], MVPA: ROC-AUC = 0.86 [0.86 - 0.87]). BFEN314+ misclassified 19.7% non-MVPA epochs as MPA, whereas ENMO192+ and GENEA250+ misclassified 32.6% and 26.5% of MPA epochs as non-MVPA, respectively. Group estimates of MPA time were equivalent (p

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