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Does Working Out Affect Testosterone Levels?

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By Eric Metcalf, MPH
WebMD Feature

If you’re a man with low testosterone, exercise may help. 

Doctors and fitness professionals still have a lot to learn about exercise and its effects on testosterone. Several factors besides your workout are involved.

But one thing is clear: You need to make exercise a habit in order to get the benefits.

After exercise, testosterone levels rise -- but not for long.  

"Sometimes it’s 15 minutes after exercise that testosterone is elevated. Sometimes it can be up to an hour,” says Todd Schroeder, PhD, who studies exercise and hormones in older men at the University of Southern California.

It's not yet clear what health effects, if any, these temporary boosts may have. Of course, exercise has many other well-known health perks.

For men who have low testosterone, exercise alone probably won’t raise their levels enough to make a difference in how they feel, says endocrinologist Scott Isaacs, MD, of Emory University. But he says for men whose testosterone level is on the borderline between normal and low, “I think it’s going to have a much more potent effect.”

4 Factors That Matter

Your weight, age, fitness level, and the timing of your workout all matter.

1. Your weight: Isaacs treats men with low testosterone. He sees obesity as a big part of the problem. 

If you’re overweight, exercise can improve your testosterone levels by helping you shed pounds, says Isaacs, the author of Hormonal Balance: How to Lose Weight By Understanding Your Hormones and Metabolism.

2. Your age: Older men seem to get less of a post-exercise boost in testosterone, Schroeder says -- though this needs more research. 

Still, exercise offers many other health benefits for older men, including bone and muscle health and better balance.

3. When you exercise: Your testosterone levels vary throughout the day. Levels are typically highest in the morning and lowest in the afternoon. 

Research has found that strength-training workouts may have a bigger effect on testosterone in the evening. As a result, the brief boost from your exercise session might be even bigger if you schedule it after work instead of early in the morning, Isaacs says.

4. Your fitness level: Not in great shape? If you start exercising, you maybe get a bigger, though still brief, boost in testosterone than a man who's already in good shape. 

But after a few weeks, your body gets used to the challenge. Eventually, you'll get a lower hormone response from the same workout, Schroeder says. 

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