Does reallocation of time from sedentary bouts to physical activity reduce adiposity in children?
ISPAH ePoster Library. Gaba A. Oct 16, 2018; 225334; 111
Mr. Ales Gaba
Mr. Ales Gaba
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Abstract Substituting sedentary time with physical activity (PA) has several health benefits. However, the effects of reallocating time from different sedentary bouts (SBs) to PA on health outcomes are not well-known. This study investigates the effects of reallocating time spent in different SBs to light-intensity (LIPA) and moderate-to-vigorous PA (MVPA) on adiposity in children. Participants were 425 school-aged children. Total sedentary time (TST) and time spent in different SBs (i.e., 1–9, 10–29 and ≥30 min) and PA were monitored using an ActiGraph accelerometer. Adiposity was expressed as fat mass percentage. To investigate the effects of reallocating TST and time spent in different SBs to PA, the compositional isotemporal substitution model was applied. The composition of movement behaviors was significantly associated with adiposity (R2=0.07; p<0.001). Further, the relative contributions of time spent in 10–29 min SB (βilr = 0.21; p=0.036), LIPA (βilr = 0.37; p=0.045) and MVPA (βilr = –0.21; p=0.004) were associated with adiposity. A negligible decrease in adiposity while reallocating TST and time in SBs to LIPA was observed. In contrast, reallocating 1 h/week of TST to MVPA resulted in a decrease of about 0.3 percent points in body fat percentage. The maximum effect on adiposity was observed while time from 10–29 min sedentary bout was reallocated to MVPA. In this case, body fat percentage decreased of about 0.4 percent points with every hour reallocated from 10–29 min SB to MVPA. Replacing sedentary time with MVPA is associated with positive effects on adiposity in children.
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