High-glucose mixed-nutrient meal ingestion impairs skeletal muscle microvascular blood flow in healthy young men
Parker, Lewan, Morrison, Dale J., Beti, Andrew C., Roberts-Thomson, Katherine, Kaur, Gunveen, Wadley, Glenn D., Sha, Christopher S. and Kesk, Michelle A. 2020, High-glucose mixed-nutrient meal ingestion impairs skeletal muscle microvascular blood flow in healthy young men, American Journal of Physiology - Endocrinology and Metabolism, vol. 318, no. 6, pp. E1014-E1021, doi: 10.1152/AJPENDO.00540.2019.
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High-glucose mixed-nutrient meal ingestion impairs skeletal muscle microvascular blood flow in healthy young men
Oral glucose ingestion leads to impaired muscle microvascular blood flow (MBF), which may contribute to acute hyperglycemia-induced insulin resistance. We investigated whether incorporating lipids and protein into a high-glucose load would prevent postprandial MBF dysfunction. Ten healthy young men (age, 27 yr [24, 30], mean with lower and upper bounds of the 95% confidence interval; height, 180 cm [174, 185]; weight, 77 kg [70, 84]) ingested a high-glucose (1.1 g/kg glucose) mixed-nutrient meal (10 kcal/kg; 45% carbohydrate, 20% protein, and 35% fat) in the morning after an overnight fast. Femoral arterial blood flow was measured via Doppler ultrasound, and thigh MBF was measured via contrast-enhanced ultrasound, before meal ingestion and 1 h and 2 h postprandially. Blood glucose and plasma insulin were measured at baseline and every 15 min throughout the 2-h postprandial period. Compared with baseline, thigh muscle microvascular blood volume, velocity, and flow were significantly impaired at 60 min postprandial (−25%, −27%, and −46%, respectively; all P < 0.05) and to a greater extent at 120 min postprandial (−37%, −46%, and −64%; all P < 0.01). Heart rate and femoral arterial diameter, blood velocity, and blood flow were significantly increased at 60 min and 120 min postprandial (all P < 0.05). Higher blood glucose area under the curve was correlated with greater MBF dysfunction ( R2= 0.742; P < 0.001). Ingestion of a high-glucose mixed-nutrient meal impairs MBF in healthy individuals for up to 2 h postprandial
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