A Swedish study offers evidence that men can reduce their risk of prostate cancer by ramping up cardio exercise.

Jan. 30, 2024, 6:39 PM EST
By Aria Bendix

Plenty of research has linked regular exercise to a lower risk of cancer, but a new study suggests that getting into better shape could reduce the risk of prostate cancer in particular, a diagnosis that around 113 out of every 100,000 men get every year in the U.S.

The research, published Tuesday in the British Journal of Sports Medicine, showed that men whose cardiorespiratory fitness improved by 3% or more annually over five years, on average, were 35% less likely to develop prostate cancer than men whose cardiorespiratory fitness declined by 3% annually. That was true regardless of men’s fitness levels when they started out.

It’s evidence, in other words, that “no matter what age, no matter where you are in your life or your relative fitness, that if you improve your fitness, even by a relatively small amount, you may significantly decrease your risk of developing prostate cancer,” said Dr. William Oh, the chief medical officer of the Prostate Cancer Foundation, who wasn’t involved in the research.

Cardiorespiratory fitness is a measure of how well the heart and lungs deliver oxygen to the muscles during exercise.

For the study, researchers from the Swedish School of Sport and Health Sciences analyzed data from more than 57,000 men in Sweden who were enrolled in a health database as early as 1982. The men took at least two fitness tests, which involved pedaling on a stationary bike and estimating the volume of oxygen they used during vigorous exercise based on their heart rate. A higher volume indicated a greater fitness level.

The tests were generally done years apart, though the exact interval varied by participant. The researchers then analyzed whether the men had developed prostate cancer after an average of seven years had passed since their last fitness tests.

The results indicated that men could decrease their risk of prostate cancer by improving their cardiorespiratory fitness through activities that elevate their heart rates, said a co-author of the study, Kate Bolam, a researcher at the Swedish School of Sport and Health Sciences.

“They want to aim for more vigorous intensity activities — that’s activities that we would do and we would struggle to maintain a conversation with a friend,” she said. “It could be line dancing if that gets your heart rate up and you think it’s fun and you’re going to do it regularly.”

Jogging, hiking or swimming are all good options, as well.

Before the new study, research had yielded mixed results about whether exercise decreased the risk of prostate cancer. Some studies even found that men with high fitness levels had a slightly increased risk of prostate cancer — but other factors may have skewed those results, said Dr. June Chan, a urology professor at the University of California, San Francisco.