Does Cardio Kill Testosterone?

Does Cardio Kill Testosterone

Does Cardio Kill Testosterone?


Cardiovascular exercise, commonly known as cardio, is an essential component of a well-rounded fitness routine. It helps improve heart health, burn calories, and reduce the risk of various diseases. However, there is a common belief among some fitness enthusiasts that cardio exercises can negatively impact testosterone levels. Testosterone, a hormone primarily found in males but also present in females, plays a vital role in muscle growth, energy levels, and overall well-being. In this article, we will explore whether cardio truly kills testosterone or if it’s just a myth.

Understanding Testosterone and its Importance

Before delving into the effects of cardio on testosterone levels, it’s crucial to have a basic understanding of what testosterone is and why it is important. Testosterone is a hormone produced primarily in the testes of males and, to a lesser extent, in the ovaries of females. It plays a significant role in the development of reproductive tissues, muscle mass, bone density, and overall physical and mental well-being.

Testosterone is responsible for an array of functions in the body. It promotes muscle growth and strength, enhances libido, contributes to fat loss, boosts energy levels, and supports cognitive function. In addition, testosterone is vital for maintaining a healthy mood and overall sense of well-being.

The Relationship Between Cardio and Testosterone

Now that we understand the importance of testosterone, let’s explore the relationship between cardio exercise and testosterone levels. Some fitness enthusiasts and bodybuilders believe that engaging in intensive cardio exercises can have a negative impact on testosterone production. According to this belief, excessive cardio can increase the production of cortisol, a stress hormone that inhibits testosterone synthesis.

While it’s true that cortisol levels can increase during prolonged and intense cardio workouts, the impact on testosterone is not as straightforward as it may seem. Several scientific studies have examined this relationship and have provided insights into the effects of cardio on testosterone levels.

Scientific Studies and Findings

A study published in the Journal of Endocrinological Investigation examined the effects of different exercise intensities on testosterone levels in endurance-trained men. The researchers found that testosterone levels were significantly elevated immediately after intense exercise. However, they returned to baseline levels within 30 minutes of completing the workout. This suggests that short-term increases in testosterone due to cardio exercise do not have a long-lasting impact on hormone levels.

Another study published in the European Journal of Applied Physiology investigated the effects of various types of exercise on testosterone levels. The researchers found that resistance training, which primarily focuses on building strength and muscle mass, resulted in higher testosterone levels compared to endurance training. However, they also observed that testosterone levels were still within the physiological range during endurance exercise and did not significantly decrease.

Based on these studies, it appears that while cardio exercise may lead to a short-term increase in testosterone levels, it does not have a detrimental effect on overall testosterone production. Additionally, the temporary rise in cortisol levels during cardio workouts does not appear to lead to a significant decrease in testosterone levels.

Benefits of Cardio Exercise

Cardiovascular exercise offers numerous benefits beyond its impact on testosterone levels. Let’s explore some of the advantages of incorporating cardio into your fitness routine:

1. Improved Heart Health: Engaging in regular cardio exercise strengthens the heart muscle, improves circulation, and lowers the risk of heart disease.

2. Weight Management: Cardio workouts help burn calories and contribute to weight loss or maintenance, depending on your goals.

3. Stress Reduction: Cardio exercise releases endorphins, also known as “feel-good” hormones, which can help alleviate stress and improve your mood.

4. Increased Stamina: Regular cardio sessions improve endurance and stamina, allowing you to perform better in other physical activities.

5. Disease Prevention: Cardiovascular exercise helps reduce the risk of various diseases, including diabetes, high blood pressure, and certain types of cancer.


Now that we have explored the relationship between cardio and testosterone, let’s address some frequently asked questions on this topic.

1. Can cardio exercise decrease testosterone levels?

The scientific evidence suggests that cardio exercise does not significantly decrease testosterone levels. While short-term increases in cortisol may occur during intense cardio workouts, these do not have a long-lasting impact on testosterone production.

2. Should I avoid cardio if I want to build muscle?

No, cardio exercise is not detrimental to muscle growth. In fact, incorporating cardio into your fitness routine can have several benefits, including improved heart health, increased stamina, and better overall physical fitness. It is important to balance cardio with strength training to achieve optimal results.

3. How much cardio should I do?

The amount of cardio you should do depends on your fitness goals and overall health. The American Heart Association recommends at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intensity aerobic activity per week. However, it’s important to listen to your body and adjust the duration and intensity of your cardio workouts accordingly.

4. Can high-intensity interval training (HIIT) impact testosterone levels?

HIIT, a form of cardio exercise that alternates between intense bursts of activity and short recovery periods, has been shown to increase testosterone levels. However, these increases are typically short-term and return to baseline levels after the workout. HIIT can be a time-efficient way to incorporate cardio into your routine while reaping the benefits of increased testosterone during and after the workout.


In conclusion, the belief that cardio kills testosterone is largely a myth. While short-term increases in cortisol levels may occur during intense cardio workouts, these do not have a significant impact on overall testosterone production. Scientific studies have shown that cardio exercise, when balanced with other forms of training, can provide numerous benefits without negatively affecting testosterone levels. So, lace up your sneakers, hit the pavement, and enjoy the many advantages that cardio has to offer for your overall health and well-being.

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