Intermittent Standing but not a Moderate Exercise Bout Reduces Postprandial Glycaemia.

Purpose: To determine if minimum recommended moderate-to-vigorous physical activity (MVPA; 30-min bout of continuous moderate-intensity walking) is sufficient to counteract the detrimental effects of prolonged sitting on postprandial metabolism and if there are any effects of breaking up sitting with intermittent standing when achieving minimum recommended MVPA. Methods: Fourteen (n=14) physically inactive healthy adult males underwent four intra-hospital 27-h interventions: 9-h continuous sitting (SIT); 15-min standing bouts every 30 min during the 9-h sitting (STAND); 30-min moderate-intensity walking bout followed by 8.5 h of sitting (MVPA); 30-min moderate-intensity walking bout followed by 15-min standing bouts every 30 min during 8.5 h of sitting (MVPA+STAND). Three standardized meals on intervention day (Day-1) and breakfast the following day (Day-2) were served. Results: Cumulative postprandial glucose response (incremental area under the curve) was lower in STAND vs. SIT ([down arrow]27%, p=0.04, effect size [ES]=-0.7) due to decreases in postprandial glucose after breakfast on Day-1 (STAND vs. SIT: [down arrow]40%, p=0.01, ES=-0.7) and Day-2 (STAND vs. SIT: [down arrow]33%, p=0.06, ES=-0.6). STAND did not impact postprandial insulin responses. Cumulative postprandial insulin response was lower in MVPA vs. SIT ([down arrow]18%, p=0.03, ES=-0.3) and MVPA+STAND vs. SIT ([down arrow]26%, p=0.02, ES=-0.4) due to expected exercise-induced decreases in postprandial insulin after breakfast on Day-1 only (MVPA vs. SIT: [down arrow]36%, p=0.003, ES=-0.7; MVPA+STAND vs. SIT: [down arrow]43%, p=0.0001, ES=-0.8). Conclusion: Breaking up prolonged sitting with non-ambulatory standing across 9 h acutely reduced postprandial glycemic response during and the day following the intervention independent of insulin levels whereas a 30-min MVPA bout did not. (C) 2017 American College of Sports Medicine

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