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Effects of postmeal exercise on postprandial glucose excursions in people with type 2 diabetes treated with add-on hypoglycemic agents.

AIMS: Type 2 diabetes treatment primarily focuses on reducing hyperglycemia, including postprandial glucose excursions. Hypoglycemic agents are used clinically to lower fasting and postprandial glucose. Metformin is the first-line therapy; however, if metformin is inadequate then 'add-on' hypoglycemic agents are implemented. Postmeal exercise has been shown to lower postprandial glucose. The aim of this study was to assess if postmeal exercise provides additional glucose-lowering benefit, beyond medication alone, in those on add-on hypoglycemic agents.

METHODS: Postprandial glucose excursions in eight participants with type 2 diabetes (Age: 60±10.7, HbA1C: 7.9±2.3) being treated with add-on hypoglycemic agents were assessed during both drug-treated sedentary and drug-treated postmeal exercise conditions. Continuous glucose monitoring was used to assess peak and area under the glucose curve (AUC) during exercise, as well as peak within a 2-h time window, 2-h total and 2-h incremental AUC after a standardized breakfast meal. Postmeal exercise consisted of 3×10-min intervals of treadmill walking at 50% maximal oxygen uptake.

RESULTS: Glucose peak (drug only: 13.8±3.7, drug/exercise: 9.9±2.7mmol/L; p=0.02) and AUC (drug only: 500±136, drug/exercise: 357±89mmol/L×40min; p=0.03) were reduced during postmeal exercise. Breakfast 2-h incremental AUC was also reduced (drug only: 585±291, drug/exercise: 330±294; p=0.047).

DISCUSSION: Post-breakfast exercise lowered glucose during the exercise bout, although this effect was not sustained on later meals.

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