A new line of research from Virginia Tech is challenging the long-standing belief that running is the best exercise for protecting against diabetes. Scientists led by Zhen Yan, director of the Center for Exercise Medicine Research at Virginia Tech, are asserting that strength training may actually outperform running when it comes to controlling blood sugar, reducing body fat, and lowering insulin resistance. Their findings come from a series of detailed experiments conducted in mice, but the results offer promising clues for human health.
The team wanted a direct comparison between endurance exercise and resistance exercise. While experts already agree that both types of exercise improve insulin sensitivity, no one had created a controlled head-to-head test. Yan’s group designed the first weightlifting model ever used in mice. It let them compare the two forms of exercise in a precise, scientific way, something that had not been done before.
Their study was published Oct. 30 in the Journal of Sport and Health Science and was supported by the National Institutes of Health and the Red Gates Foundation.
Because mice cannot walk into a gym, the researchers invented a clever system. Each mouse in the weightlifting group wore a small shoulder collar and had to lift a weighted lid to reach its food. The motion was similar to a squat, and the load was gradually increased just like progressive strength training in humans.
Another group of mice had free access to a running wheel, which gave them endurance exercise. Control groups of mice were either inactive or fed different diets.
Over eight weeks, the team tracked body fat, blood sugar control, exercise capacity, heart and muscle function, and insulin signaling inside the muscle.
Why Weightlifting Did Better Than Running
Both exercise groups improved, but weightlifting mice consistently showed stronger benefits. Resistance training produced bigger drops in belly and under-the-skin fat, better glucose tolerance, and lower insulin resistance. These improvements are some of the most important indicators in preventing and managing type 2 diabetes.
Yan explained that “weight training has equal, if not better, anti-diabetes benefits” compared to running. He also noted that this is encouraging for people who cannot run or who have mobility or endurance limitations.
Interestingly, the advantage did not come from increased muscle mass or better exercise performance. The scientists believe that weightlifting triggers unique metabolic pathways inside muscle cells that specifically improve blood sugar management.
What They Are Recommending
While the research was done in mice, the scientists say the findings closely mirror how human muscles respond to exercise. Their recommendation is clear: do both endurance and resistance exercise when possible. Together, they give the broadest health benefits. But if a person cannot run or prefers not to, lifting weights alone still offers powerful protection against diabetes.
Yan also emphasized that even with the popularity of diabetes drugs like GLP-1 medications, exercise cannot be replaced. Medication may help manage diabetes, but it does not reproduce the full metabolic benefits that come from physical activity.
Why This Matters
More than 38 million Americans have diabetes, and obesity remains a major risk factor. Finding ways to prevent the disease is critical. The Virginia Tech study adds important evidence that strength training may be an especially effective tool. Running still helps, but weightlifting appears to go even further in restoring normal blood sugar function in the face of a high-fat diet.
Because the study was done in mice, more human research is needed. Still, the work provides new insight into how resistance exercise protects the body. It also challenges the long-held idea that cardio is always the superior choice.
For now, the message is simple. Lifting weights is not just for building muscle. It may be one of the most powerful, accessible tools for preventing diabetes that we have.
