The purpose was eyevan 163 to examine and compare the effects of replacing time spent sitting with standing at work on fat-free mass, fat mass and waist circumference using isotemporal substitution.Analyses were conducted on work hours on both cross-sectional and longitudinal data.The study included 223 persons from an intervention study aimed at reducing sitting time at work among office employees.Sitting, standing and anthropometry were measured objectively.Cross-sectional isotemporal substitution analyses were modelled on baseline data, while longitudinal analyses were modelled based on differences in sitting and standing time at work between baseline and 1-month follow-up in relation to differences in anthropometric measures between baseline and 3-months follow-up.
Replacing one hour of sitting time with one hour of standing was associated with a 0.21 kg higher fat-free mass in the longitudinal analysis and 0.95 kg medline k4 basic wheelchair in the cross-sectional analysis.Fat mass was 0.32 kg lower in the longitudinal analysis and 0.
61 kg lower in the cross-sectional analysis.Waist circumference decreased by 0.38 cm in the longitudinal analysis and 0.81 cm in the cross-sectional analysis.Both cross-sectional and longitudinal analyses showed an effect on body composition measures by replacing one hour of sitting with standing however, this effect was largest in the cross-sectional analyses.
Trial registration ClinicalTrials.gov NCT01996176.