Low physical activity, high sedentary time in nonobese adults tied to greater adiposity
High sedentary time (ST) and low moderate-to-vigorous physical activity (MVPA) among nonobese young adults are associated with increased adiposity, reports a new study. However, these factors do not predict change in adiposity over time.
Participants (mean body mass index [BMI], 22.6±2.4 kg/m2) had 8.5±1.5 ST/day and 0.4±0.3-hour MVPA/day. At baseline, engagement in ST for ≥8 hours/day was associated with greater fat mass (FM), anthropometry (%FM) and lower MVPA, whereas MVPA for ≥30 min/day was associated with lower FM and %FM.
Fully adjusted models showed the significant association of ST with baseline body weight, hip circumference, BMI, FM and %FM and with year-1 body weight, waist and hip circumference, FM and %FM, but not with any year-2 adiposity indicators. In addition, MVPA did not correlate with any adiposity indicators at baseline, year 1 or year 2.
Participants significantly increased waist circumference, BMI, FM and %FM over 2 years (p<0.05 for all), but no associations were found among baseline ST and MVPA with change in adiposity.
In this study, the authors recruited 71 adults aged 20–35 years. They measured ST and MVPA by accelerometry and reported energy intake at baseline, and %FM and FM by dual-energy X-ray absorptiometry at baseline, year 1 and year 2.
Repeated-measures linear regression models were used to examine the associations of baseline ST and MVPA with adiposity, controlling for age, sex and reported energy intake. The Benjamini-Hochberg procedure was used to adjust for multiple comparisons.