Current and 1-Year Psychological and Physical Effects of Replacing Sedentary Time With Time in Other Behaviors

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..

..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.

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