Validity of measured energy expenditure in overweight and obese children when using Inner View Professional software v5.1 and 6.1 together with SenseWear Pro2 Armband

• The aim was to investigate the validity of SenseWear Pro2 Armband (SWA) when assessing energy expenditure of overweight and obese children. A random selection of 22 children with an isoBMI>25 were recruited from 8-11 year olds participating in an intervention study. Energy expenditure in free-living condition was assessed during 14 days by using SWA. The armband was worn 24h/d, and removed only for water activities. Total energy expenditure was measured with double labelled water (DLW) method during the same period covered by SWA. During the data collection, an updated version of the software used by SWA was released and data were analysed with both software version. The validity when using software version 5.1 (SWA5.1) and 6.1 (SWA6.1) was investigated by comparison with measured energy expenditure by DLW method. In total, 11 girls and 11 boys with mean age of 10.3±0.99 years and isoBMI 22.8±0.62 participated. The average wearing time of SWA was 12 days (range 7-14) and 23.3 h/day (range 18.8-24.0). There was no statistically significant difference in mean physical activity level (PAL) by SWA5.1 compared by DLW-method. A minor non-significant underestimation of energy expenditure 0.02±1.20 MJ/day (95%CI -0.55,0.52) measured by SWA5.1 compared with DLW-method was shown. However, the children's PAL according to SWA6.1 was 1.37 compared with 1.68 according to DLW method. When assessed by SWA6.1 there was a significant underestimation of energy expenditure by 1.96±1.03MJ/day (95%CI-2.42,-1.50) compared with DLW-method. The differences between SWA5.1 andSWA6.1 may be partly explained bya statistically significant difference in the amount of time the two software versions have registered time spent on different activity levels (MET<3, MET3-<6, MET6-<9, MET≥9). When comparing time spent on sedentary activities (MET<3) significantly less time was assessed by SWA5.1 compared with SWA6.1, 18±2.1 h/d and 20±2.4 h/d respectively. These differences became more apparent at higher METs. A significantly longer time spent on activities with MET≥9, was assessed by SWA5.1 compared with SWA6.1, 11±26 min/d and 2.5±5.3 min/d respectively. In conclusion, the SWA with software v 5.1, but not with software v 6.1, is a valid device to accurately measure energy expenditure at group level in overweight and obese children during free-living condition.

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Kostvetenskap

Food and Nutrition

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