Sedentary behavior and physical activity classification using accelerometer cut points in 9–11-year-old children

Publication date: Available online 25 September 2018Source: Science & SportsAuthor(s): B. Al-Hadabi, R. Haj SassiSummaryObjectivesTo validate accelerometer counts against oxygen uptake in 9 to 11 years old children performing a number of highly variable physical activities and to determine accelerometer cut-off points for sedentary behavior, light, moderate, and vigorous physical activities.Equipment and methodsEight boys and 6 girls aged 9 to 11 years old (height: 1.40 ± 0.06 m, body mass: 33.5 ± 5.1 kg, BMI: 16.9 ± 2.0 kg/m2, body fat: 17.0 ± 4.8%, estimated VO2max: 50.85 ± 4.8 ml.kg−1.min−1) volunteered to participate in this study. They performed eight activities of different intensity namely watching TV, arts-crafts, slow and brisk forward walking, slow backward walking, forward running, aerobics and step-ups while VO2 and counts were determined using indirect calorimetry and accelerometer, respectively.ResultsA highly significant correlation was found between accelerometer counts and VO2 (r = 0.86, P < 0.01). Significant differences were observed between predicted and measured VO2 for ART, SWB and Aerobic activities (P = 0.0003; P < 0.0001 and P = 0.0004, respectively). Bland and Altman plot revealed no significant bias for all other activities (−0.6 ml.kg−1.min−1, P = 0.347) with 95% limits of agreement (LoA)...
Source: Science and Sports - Category: Sports Medicine Source Type: research