Resistance Training vs Running for Blood Sugar and Type 2 Diabetes

A US research team compared two familiar exercise approaches, not in a gym but within an ingeniously designed mouse enclosure. Their aim was straightforward: to see which form of training more effectively shifts blood sugar towards healthier levels, and what this could suggest for people at risk of type 2 diabetes.

What the new mouse model reveals

Scientists at Virginia Tech and the University of Virginia created a tightly controlled study, publishing the results on 30 October 2025 in the Journal of Sport and Health Science. They developed a “weightlifting” cage in which mice had to raise a weighted lid to access food. The resistance increased progressively, reflecting progressive strength training in humans. Another group chose to run on a wheel, modelling endurance exercise. Two inactive control groups received either a standard diet or a high-fat diet.

“To get food, the mice had to lift weight. That simple mechanic created the first robust rodent model of resistance training.”

Across eight weeks, the researchers assessed body mass, fat distribution, heart and muscle performance, physical capability and, most importantly, the way the mice processed glucose and reacted to insulin. They also examined insulin signalling within skeletal muscle to identify the cellular shifts produced by each exercise method.

What the findings say about blood sugar

Each training approach cut abdominal and subcutaneous fat. Both also improved blood sugar regulation relative to sedentary mice. However, the resistance-trained mice achieved the largest improvements in glycaemic control and in insulin-signalling pathways within muscle.

“In this model, strength work outperformed running on markers that track the body’s ability to move and store glucose efficiently.”

Key results at a glance

• Resistance training produced bigger improvements in glycaemic control than endurance running.
• Both forms of exercise reduced damaging fat deposits around the abdomen.
• Training increased muscle insulin signalling, with the resistance group showing the greater response.
• The findings point towards potential therapeutic targets for type 2 diabetes, which affects roughly one in nine adults worldwide.

Why muscle makes a difference

Muscle functions as a reservoir for glucose. Larger, stronger muscles can remove more glucose from the blood during exercise and afterwards. Resistance training also encourages GLUT4 transporters to move to the cell surface, accelerating glucose uptake even when insulin levels are low or cells have become resistant to it. Endurance activity has this effect as well, but strength training enlarges the reservoir itself through structural muscle growth.

What this means for people, with caveats

These findings come from mice, so applying them to human health requires caution. Even so, the model is consistent with real-world evidence showing that strength training can improve insulin sensitivity, reduce visceral fat and aid weight management. For most adults, combining both activities is likely to be the strongest strategy: consistent aerobic exercise for cardiovascular health and endurance, plus strength work on two or more days each week to support glucose control and resilient muscles.

“Don’t ditch running. Add muscle. The combination covers heart, glucose, and long-term independence.”

Simple ways to add strength work safely

• Begin with bodyweight exercises: chair squats, wall or knee press-ups, glute bridges and calf raises.
• Exercise on two non-consecutive days each week. Target 2–3 sets of 8–12 repetitions for every exercise.
• Increase the challenge gradually: once 12 repetitions feel easy, add a repetition, another set or a small amount of weight.
• Focus on major muscle groups-legs, back and chest-as these have the greatest effect on glucose uptake.
• If you use insulin or sulfonylureas, test your glucose before and after exercise to prevent hypos.
• Support muscle recovery and growth by combining training with protein-rich meals.

Try a short, practical starter plan

Start with five minutes of brisk marching and arm circles to warm up. Next, complete this circuit twice, resting for 60 seconds between exercises:

• 10–12 chair squats
• 10–12 incline press-ups against a worktop
• 12 hip bridges
• 12 backpack rows using a light bag
• 20-second plank or hands-and-knees hold

End with gentle stretches for your hips and chest. Do the routine two or three times weekly. Gradually introduce light resistance, such as water bottles, resistance bands or a rucksack containing a book.

Who stands to benefit most

People with prediabetes or a family history of type 2 diabetes may gain an advantage by introducing strength work early. Older adults can benefit through improved bone density, joint stability and balance. Post-menopausal women may receive metabolic and skeletal gains that walking alone might not provide. Short, targeted strength sessions can also offer considerable value to people with limited time.

Risks, adjustments and timing

Strength training may reduce glucose levels for 24–48 hours. If you take insulin or glucose-lowering tablets, monitor your levels and keep fast-acting carbohydrates available. Return at a low intensity after illness or injury. If you have neuropathy, take care to protect your feet. Vary movement patterns to reduce the risk of overuse. Exercising after meals may help limit blood sugar spikes, or you can combine a session with a brief walk for a one-two punch.

Where science goes next

The study highlights molecular switches in muscle that could become drug targets, including insulin-signalling nodes and myokines that communicate with the liver and fat tissue. Future work will include human trials comparing different cardio and resistance combinations, dose-response patterns and home-based programmes suited to busy routines. Researchers also hope to establish whether lifting before cardio, or doing cardio first, best improves glucose handling throughout the day.

Terms worth knowing

• Insulin sensitivity: how effectively cells respond to insulin’s instruction to absorb glucose.
• Visceral fat: fat held around the organs, associated with poorer metabolic health.
• Progressive overload: increasing the training challenge over time so muscles continue to adapt.
• GLUT4: a transporter that carries glucose into muscle cells; exercise helps move it to the surface.