Impacto dos pontos de corte nas estimativas do comportamento sedentário mensurado por acelerômetro em adolescentes

Abstract

This study purpose was to analyze the impact of cut points on sedentary behavior (SB) in teenagers. A cross-sectional study with teenagers aged between 10 and 14 years old (n = 545 and n = 593 - definition of 20 and 60 minutes of no accelerometer use, respectively) of public schools in João Pessoa (PB), 2014. The SB was measured by using an accelerometer (ActiGraph GT3X +), estimated from the application of the following cut points: Evenson (≤ 25 counts/15sec), Puyau (< 800 counts/60sec), Vanhelst (≤ 400 counts / 60sec), Hänggi (<3 counts/1sec) and Romanzini (≤ 180 counts/15sec). To compare the time and the prevalence of teenagers in excessive SB time (≥ 8 hours/day) ANOVA ONE-WAY (post hoc of bonferroni) and Cochran's Q Test were used, respectively. Significant differences were observed in the average SB time between cut points for both criteria of no accelerometer use (20 minutes vs. 60 minutes): Evenson (464.04 ± 94.51 vs. 502.41 ± 108.80), Puyau (680.95 ± 85.53 vs. 716.52 ± 103.32), Vanhelst (584.81 ± 86.04 vs. 677.53 ± 85.78), Hänggi (310.51 ± 88.86 vs. 354.58 ± 106.48), and Romanzini (547.37 ± 94.56 vs. 583.93 ± 109.03). We also observed differences in the prevalence of time (p > 0.05), ranging from 3.3% to 99.3%, depending on the used criteria. The application of different cut points and definitions of no accelerometer use produces differences in average time and prevalence of excessive SB time in teenagers.