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Afternoon exercise is more efficacious than morning exercise at improving blood glucose levels in individuals with type 2 diabetes: a randomised crossover trial – published online 13/11/2018

Fig from Savikj paper

Mladen Savikj, Brendan M. Gabriel, Petter S. Alm, Jonathon Smith, Kenneth Caidahl, Marie Björnholm, Tomas Fritz, Anna Krook, Juleen R. Zierath, Harriet Wallberg-Henriksson

Glucose tolerance, insulin sensitivity and skeletal muscle oxidative capacity undergo circadian oscillations, and the interaction of these factors could lead to divergent adaptations to exercise. High-intensity interval training (HIIT) has a beneficial effect on blood glucose concentration in individuals with type 2 diabetes. However, the time of day that results in the strongest adaptations of blood glucose levels to HIIT remains unknown. In this issue, Savikj, Gabriel et al ( report on a randomised crossover trial of 11 men with type 2 diabetes. They demonstrate that afternoon HIIT is more efficacious than morning HIIT at lowering blood glucose values in this cohort. Furthermore, morning HIIT had early deleterious effects on blood glucose values. The authors’ data highlight the importance of optimising the timing of exercise when prescribing HIIT in the clinical management of type 2 diabetes.

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