Combined effect of body position, apparatus and distraction on children's resting metabolic rate

Abstract

Objective: To verify the combined effect of body position, apparatus and distraction on children’s resting metabolic rate (RMR). Methods. Experiments were carried out on 14 children aged 812 (mean age10.1 years 91.4). Each participant underwent two test sessions, one week apart under three different situations: a) using mouthpiece and nose-clip (MN) or facemask (FM); b) sitting (SEAT) or lying (LY); and c) TV viewing (TV) or no TV viewing. In the first session, following 20 min rest and watching TV, the protocol was: LY: 20 min stabilization; 10 min using MN and 10 min using FM. Body position was then changed to seated: 20 min stabilization; 10 min using FM; 10 min using MN. In the second session, FM and MN order was changed and participants did not watch TV. Data were analysed according to the eight combinations among the three studied parameters. Results. Repeated measures ANOVA indicated statistically significant differences for
/V˙O2 (p0.01) and RMR (p0.02), with TVMNSEAT showing higher values than TVFMLY. Bland-Altman analysis showed a bias for V˙O2, V˙CO2, respiratory quotient (RQ) and RMR between TVFMLY and TVMNSEAT, respectively, of 17.8914.5 (ml min), 8.8914.5 (ml min), 0.0390.05 and 115.29101.9 (kcal/day). Conclusion. There were no differences in RMR measurements due to body position and apparatus when each variable was isolated. Analyses of
distraction in three of four combinations indicated no difference between TVand no TV. Different parameter combinations can result in increased bias and variability, and thereby the reported differences among children's RMR measurement.