Introduction
Sedentary time is inversely associated with health. Capturing 24 hours of behavior
(i.e., sleep, sedentary, light physical activity, and moderate-to-vigorous physical
activity) is necessary to understand behavior–health associations.
Methods
Healthy young adults aged 20–35 years (n=423) completed the Profile of Mood States, the Perceived Stress Scale, and dual-energy
x-ray absorptiometry and anthropometric measures at baseline and 12 months. Time spent
sedentary (total, in prolonged [>30 minutes] and short [≤30 minutes] bouts), in light
physical activity (1.5–3.0 METs), moderate-to-vigorous physical activity (>3.0 METs),
and asleep, were assessed through SenseWear armband worn 24 hours/day for 10 days
at baseline. Isotemporal substitution modeling evaluated cross-sectional and longitudinal
psychological and physical health associations of substituting sedentary time with
sleep, light physical activity, or moderate-to-vigorous physical activity. Data were
collected from 2010 to 2015 and analyzed in 2019.
Results
Cross-sectional analyses revealed substituting prolonged sedentary time for sleep
was associated with lower stress (standardized β= −0.11), better mood (−0.12), and
lower BMI (−0.10). Substituting total or prolonged sedentary for moderate-to-vigorous
physical activity was associated with lower body fat percentage (total, −0.22; prolonged,
−0.23) and BMI (−0.40; −0.42). Higher BMI was associated with substituting total or
prolonged sedentary for light physical activity (0.15; 0.17); lower BMI with substituting
prolonged sedentary for short bouts (−0.09). Prospective analyses indicated substituting
total or prolonged sedentary with light physical activity was associated with improved
mood (−0.16; −0.14) and lower BMI (−0.15; −0.16); substituting with moderate-to-vigorous
physical activity was associated with improved mood (−0.15; −0.15).
Conclusions
Short- and long-term psychological benefits may result from transitioning sedentary
time to light physical activity or sleep, whereas increasing moderate-to-vigorous
physical activity may be required to influence physical health.
Trial registration
This study is registered at www.clinicaltrials.gov NCT01746186.
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Article info
Publication history
Published online: May 14, 2020
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© 2020 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.
