2134/11341736.v1 Joe Henson Joe Henson Charlotte Edwardson Charlotte Edwardson Carlos A Celis-Morales Carlos A Celis-Morales Melanie J Davies Melanie J Davies David Dunstan David Dunstan Dale Esliger Dale Esliger Jason MR Gill Jason MR Gill Aadil Kazi Aadil Kazi Kamlesh Khunti Kamlesh Khunti James King James King Matthew McCarthy Matthew McCarthy Naveed Sattar Naveed Sattar David Stensel David Stensel Latha Velayudhan Latha Velayudhan Francesco Zaccardi Francesco Zaccardi Thomas Yates Thomas Yates Predictors of the acute postprandial response to breaking up prolonged sitting Loughborough University 2019 Postprandial Physical activity Sedentary behaviour Risk factors Insulin Glucose 2019-12-12 10:27:58 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Predictors_of_the_acute_postprandial_response_to_breaking_up_prolonged_sitting/11341736 <div>Purpose</div><div>To identify predictors of favourable changes to postprandial insulin and glucose levels in response to interrupting prolonged sitting time with standing or light intensity physical activity.<br></div><div>Methods<br></div><div>Data were combined from four similarly designed randomised acute cross-over trials (n=129; BMI range 19.6 to 44.6kg/m2; South Asian=31.0%; dysglycaemia=27.1%). Treatments included: prolonged sitting (6.5hours) or prolonged sitting broken-up with either standing or light-intensity physical activity (5 minutes every 30 minutes). Time-averaged postprandial responses for insulin and glucose were calculated for each treatment (mean±95% CI). Mutually adjusted interaction terms were used to examine whether anthropometric (BMI), demographic (age, sex, ethnicity (white European vs. South Asian)) and a cardiometabolic<br></div><div> variable (HOMA-IR) modified responses.</div><div>Results<br></div><div>Postprandial insulin and glucose were reduced when individuals interrupted prolonged sitting with bouts of light physical activity, but not with standing. Reductions in time-averaged postprandial insulin were more pronounced if individuals were South Asian compared with white European (-18.9mU/L (-23.5%) vs. -8.2mU/L (-9.3%)), female compared to male (-15.0mU/L (-21.2%) vs. -12.1mU/L (-17.6%)) or had a BMI ≥27.2kg/m2 (-20.9mU/L (-22.9%) vs. -8.7mU/L (-18.2%)). Similarly, being female (-0.4mmol/L (-0.6mmol/L, -0.2mmol/L) (-6.8%) vs. –0.1mmol/L (-0.3mmol/L, 1mmol/L) (-1.7%)) or having a BMI ≥27.2kg/m2 (-0.4mmol/L (-0.6mmol/L, -0.2mmol/L) (-6.7%) vs. –0.2mmol/L (-0.4mmol/L, 0.0mmol/L) (-3.4%)) modified the postprandial glucose response. No significant interactions were found for HOMA-IR or age.<br></div><div>Conclusion<br></div><div>Being female, South Asian or having a higher BMI, all predicted greater reductions in postprandial insulin, while being female and having a higher BMI predicted greater reductions in postprandial glucose when sitting was interrupted with light physical activity. These results could help to guide personalised interventions in high-risk participants for whom breaking prolonged sitting time with light activity may yield the greatest therapeutic potential.<br></div>