The Potential Impact of Displacing Sedentary Time in Adults with Type 2 Diabetes.

• Autores: Catherine L. Falconer, Ashley R. Cooper, Angie S. Page, Rob C. Andrews
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 47, Nº. 10, 2015, págs. 2070-2075
• Idioma: inglés
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• Resumen

  • AB Purpose: Sedentary time, in particular, prolonged unbroken sedentary time, is detrimental to health and displaces time spent in either light or moderate intensity physical activity. This cross-sectional study aimed to identify the potential impact of reallocating time from sedentary behaviors to more active behaviors on measures of body composition and metabolic health in people with type 2 diabetes. Methods: Participants were 519 adults with newly diagnosed type 2 diabetes who had been recruited to the Early Activity in Diabetes (Early ACTID) randomized controlled trial. Waist-worn accelerometers were used to obtain objective measurement of sedentary time, light physical activity (LPA), and moderate-to-vigorous physical activity (MVPA) at baseline alongside clinical measurements and fasting blood samples to determine cholesterol, triglycerides, HOMA-IR, and glucose. Isotemporal substitution modeling was performed to determine the potential impact of reallocating 30 min of sedentary time accumulated in a single bout (long bout) with 30 min of interrupted sedentary time, LPA, or MVPA. Results: Sedentary time accounted for 65% of the waking day, of which 45% was accumulated in prolonged (>=30 min) bouts. Reallocation of 30 min of long-bout sedentary time with 30 min of short-bout sedentary time was associated with lower body mass index (BMI) (adjusted [beta], -0.60; 95% confidence interval [CI], -1.00, -0.21) and waist circumference (WC) (adjusted [beta], -1.16; 95% CI, -2.08, -0.25). Stronger effects were seen for LPA and MVPA. Reallocation of 30 min of long-bout sedentary time with LPA was associated with higher HDL-cholesterol (adjusted [beta], 0.02; 95% CI, 0.00-0.03 mmol[middle dot]L-1). Conclusions: Encouraging adults with newly diagnosed type 2 diabetes to break up prolonged periods of sedentary time may be an effective strategy for improving body composition and metabolic health.