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

ABSTRACTPurposeThis study aimed to examine the validity of wrist acceleration cut points for classifying moderate (MPA), vigorous (VPA), and moderate-to-vigorous (MVPA) physical activity.MethodsFifty-seven children (5–12 yr) completed 15 semistructured activities. Three sets of wrist cut points (>192 mg, >250 mg, and >314 mg), previously developed using Euclidian norm minus one (ENMO192+), GENEActiv software (GENEA250+), and band-pass filter followed by Euclidian norm (BFEN314+), were evaluated against indirect calorimetry. Analyses included classification accuracy, equivalence testing, and Bland–Altman procedures.ResultsAll cut points classified MPA, VPA, and MVPA with substantial accuracy (ENMO192+: κ = 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+: κ = 0.75 [0.74–0.76], MVPA: ROC-AUC = 0.85 [0.85–0.86]; BFEN314+: κ = 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 192 mg, >250 mg, and >314 mg), previously developed using Euclidian norm minus one (ENMO192+), GENEActiv software (GENEA250+), and band-pass filter 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+: κ = 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+: κ = 0.75 [0.74–0.76], MVPA: ROC-AUC = 0.85 [0.85–0.86]; BFEN314+: κ = 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

from Sports Medicine via xlomafota13 on Inoreader http://ift.tt/2EtNs0S
via IFTTT