Post Time: 2025-07-26
Exercise is a vital component of overall health, and it plays a significant role in regulating blood sugar levels. Regular physical activity can improve insulin sensitivity, allowing the body's cells to absorb glucose more effectively.
When you exercise, your muscles require energy, which they obtain from breaking down stored glycogen into glucose. This process triggers an increase in insulin production, helping to manage blood sugar levels and reduce spikes after meals.
In fact, a study published in the Journal of Clinical Endocrinology and Metabolism found that moderate-intensity aerobic exercise can improve insulin sensitivity by up to 24% over just eight weeks (1). Regular physical activity has also been shown to lower fasting glucose levels and hemoglobin A1c (HbA1c) concentrations, indicating improved blood sugar control.
However, it's essential to note that the timing of your workouts relative to meals can impact post-exercise blood sugar levels. Exercising after a meal can reduce insulin sensitivity, whereas exercising before a meal may have minimal effects on glucose metabolism.
Balancing Blood Sugar with Exercise: Understanding Glucose Uptake
When you exercise, your body relies more heavily on stored glycogen and fat for energy rather than relying solely on blood sugar levels. This shift in fuel sources reduces the demand placed on insulin production, which can help manage spikes in post-exercise glucose.
The uptake of glucose by muscles during exercise is a critical component of this process. Glucose transport proteins play an essential role in facilitating the transfer of glucose across cell membranes and into muscle cells for energy (2).
Research has shown that regular aerobic exercise increases GLUT4 translocation to the surface of skeletal muscle fibers, enhancing insulin-stimulated glucose uptake by up to 200% after just four weeks of training (3). This increased efficiency means your body can better regulate blood sugar levels in response to exercise.
The Role of Carbohydrates in Exercise and Blood Sugar Levels
Carbohydrate intake is essential for maintaining energy stores before, during, and after workouts. Consuming a balanced meal with complex carbohydrates several hours prior to physical activity helps maintain stable blood glucose levels throughout the exercise period (4).
Aim for moderate carbohydrate intakes from sources such as whole grains, fruits, vegetables, legumes, nuts, and seeds that are rich in fiber and nutrients but relatively low on the glycemic index.
Timing of meals is also crucial. Consuming a balanced meal 2-3 hours before exercising can provide stable energy levels during physical activity (5).
How Exercise Influences Insulin Sensitivity
Regular exercise improves insulin sensitivity by enhancing glucose uptake, reducing inflammation in muscle and adipose tissue, and promoting optimal gene expression within the body's metabolic pathways.
Moreover, physical activity enhances vascular function, promotes blood flow to exercising muscles, facilitating nutrient delivery for fuel production (6).
While regular aerobic exercises like running or swimming may be beneficial for improving insulin sensitivity at all ages. The results vary across individuals; it is essential to discuss with a healthcare professional when starting any exercise regimen and incorporate both aerobic activities into your daily routine.
The Impact of Exercise on Blood Sugar Variability
Exercise has been shown to decrease blood sugar variability in healthy adults by reducing the impact of meals on postprandial glucose levels (7). This can translate into improved HbA1c values, reduced risk for diabetic complications, and overall better metabolic health.
Regular aerobic exercise should be performed at moderate intensity for most individuals. High-intensity interval training programs may be beneficial to improve cardiovascular fitness but are not typically recommended as a first step in your physical activity plan (8).
Combining Exercise with Lifestyle Changes: Best Practices
Incorporating regular exercise into daily life is crucial for maintaining optimal blood sugar levels and minimizing fluctuations.
To maximize benefits:
- Perform both aerobic exercises like cycling or jogging at least three to four times per week.
- Incorporate resistance training (weightlifting) one to two times weekly on non-consecutive days.
- Aim to do at least eight hours of sleep each night for optimal recovery and muscle repair after physical activity.
Exercise offers numerous benefits in improving insulin sensitivity, glucose uptake by muscles, reducing blood sugar variability, and minimizing risk factors associated with metabolic diseases like diabetes type II
In this video, we'll show you how to find the carb count on prepackaged foods with a Nutrition Facts label and explain what to do if you plan to eat vitamins to help lower blood sugar more or less than the listed serving size. We also offer advice on what to do if you are eating a meal that does not have readily available nutrition information. The advice in this video is not intended to replace the instructions from your diabetes team. Please talk to your team about how to tailor this information to meet your blood sugar high levels needs. This video is part of a 102 blood sugar after meal wider series about managing diabetes. You can find the full playlist here: ------------------------------------------------------- Subscribe to Michigan Medicine’s YouTube channel for upcoming videos and future live streams featuring our experts answering your questions. ------------------------------------------------------- Follow Michigan Medicine on Social: Twitter: Instagram: Facebook: #MichiganMedicine #Diabetes #T1D #Type1 #DiabetesMellitus