Managing blood sugar levels is a global public health issue. Glucose spikes that occur after meals (postprandial hyperglycemia) are particularly damaging to blood vessels and are a precursor to type 2 diabetes. New research in exercise physiology suggests that the timing of physical activity is as important as its duration.

The role of the soleus muscle

The soleus muscle, located in the calf, has unique metabolic properties. Unlike other muscles that mainly use stored glycogen, the soleus is able to draw directly on glucose and fats circulating in the blood to function for hours without fatigue.
Walking activates this “metabolic engine.” A study published in Sports Medicine compared the effects of prolonged sitting versus short periods of light walking after meals.

Physiological data

The results are clear: walking for 2 to 5 minutes within 60 minutes after a meal significantly smooths the glycemic curve. The researchers observed a reduction in insulin and glucose spikes of up to 17% compared to the sedentary control group. This phenomenon can be explained by the increase in the membrane permeability of muscle cells to glucose, a process independent of insulin secretion.

Incorporating “micro-sessions” of walking after meals is an effective strategy for improving insulin sensitivity. It is not about burning calories massively, but about activating the cellular machinery when the body needs it most to regulate its metabolism.