Athena Vale
There is a common misconception that cardio burns muscle. However, research suggests that this is not the case. Cardio is an effective way to burn fat, and it can actually help to increase muscle size and strength when paired with a healthy diet and weight training. While excessive endurance training may lead to muscle loss, moderate amounts of cardio—such as 30-45 minutes a few times a week—can increase muscle mass and improve overall health.
| Characteristics | Values |
|---|---|
| Does cardio burn muscle? | Research suggests that cardio does not burn muscle. However, extreme endurance training may lower testosterone levels and hinder muscle growth. |
| Cardio and muscle growth | Cardio can increase muscle size and strength by increasing capillary density, optimising repair pathways, and improving insulin sensitivity. |
| Recommended cardio duration | 30-45 minutes, a few times a week. |
| Cardio and fat burning | Cardio is an effective way to burn fat. It increases overall calorie burn and fat burn, especially when performed in interval training style. |
| Cardio and muscle preservation | To prevent using muscle as fuel during intense cardio, consume fast-digesting carbohydrates before or after the workout. |
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What You'll Learn
Cardio can increase muscle size
Cardio has long been thought to hinder muscle growth, with many believing that it can eat away at muscle. However, this is not necessarily true, and research has shown that cardio can, in fact, increase muscle size.
Firstly, it is important to note that doing cardio too frequently, intensely, or for too long can hinder muscle growth. This is because the body needs resources, such as good nutrition and carbohydrates, to build muscle, and doing too much cardio can deplete these resources. Additionally, the body needs rest and recovery time to build muscle, and excessive cardio can interfere with this process.
However, when done in moderation, cardio can be beneficial for muscle growth. Research has shown that 30-45 minutes of cardio a few times a week can increase muscle mass. Cardio increases the number of capillaries in the muscles, improving the transportation of oxygen, nutrients, and hormones to the muscles. This optimizes the pathways that the body uses to repair damage from weight training. Cardio has also been found to improve insulin sensitivity, which can enhance the body's ability to process and use carbohydrates.
Furthermore, studies have shown that high-intensity interval training (HIIT) with cardio movements such as rowing, running, elliptical training, or biking can lead to increased muscle mass. HIIT that includes multiple types of exercises, particularly bodyweight exercises, has an even greater potential for increasing muscle mass. Additionally, HIIT is time-efficient and provides improved exercise capacity.
In conclusion, while excessive cardio can hinder muscle growth, moderate cardio done a few times a week can increase muscle size. This is because cardio increases the number of capillaries in the muscles, improves transportation of nutrients, and enhances the body's ability to repair and recover. Therefore, incorporating cardio into a workout routine can be beneficial for those looking to increase muscle size.
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Prolonged endurance training may lower testosterone
Cardio exercise is an excellent way to burn fat and build muscle. However, some people worry that too much cardio could negatively impact their muscle gains. While this concern is understandable, research suggests that, when paired with adequate nutrition, cardio can support muscle growth.
That being said, there is evidence that an endurance training regime with an excessive amount of cardio could negatively impact testosterone levels in men. Research has shown that chronic exposure to prolonged endurance training can lead to disturbances within the reproductive physiological and endocrinological systems of humans. For example, a study found that endurance-trained men had lower levels of testosterone at rest compared to untrained men.
The mechanism behind this lowering of testosterone is currently unclear, but it may be related to dysfunctions within the hypothalamic-pituitary-testicular regulatory axis. This assumption is based on observed abnormalities in resting testosterone levels and the pituitary release of luteinising hormone and prolactin. It is important to note that the majority of research on this topic has been conducted on female athletes, and there are relatively fewer studies on the effects of endurance training on the male reproductive system.
Additionally, it is worth noting that the potential negative impact of endurance training on testosterone levels may be mitigated by adequate nutrition. Research has shown that cardio can increase muscle size and mass, which can lead to an increase in metabolism. Furthermore, cardio has been found to improve insulin sensitivity, which is important for processing and utilizing carbohydrates effectively.
In conclusion, while there is evidence that prolonged endurance training may lower testosterone levels, more research is needed to fully understand the mechanism behind this effect. It is also important to consider the potential benefits of cardio, such as increased muscle mass and improved insulin sensitivity, when making training decisions. A balanced approach to training, combining cardio and strength work, can be an effective way to support overall health and fitness goals.
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Cardio can help burn excess calories
Cardio is an effective way to burn excess calories and lose weight. Cardiovascular exercises, such as running, cycling, and high-intensity interval training (HIIT), increase the body's metabolic rate and promote fat burning. The more intense the movement is, the more calories you will burn.
Cardio workouts typically burn more calories than weight-training sessions. For example, a 30-minute moderate-pace bicycle ride can burn around 145 calories, while an intense 10-mile-per-hour ride can burn approximately 295 calories. In comparison, a 30-minute weight-training session might burn around 110 calories.
Additionally, cardio exercises have the advantage of burning both carbohydrates and stored fat simultaneously. This process starts a chemical reaction that breaks down triglycerides in fat mass and uses the released energy for activity. However, it is important to note that the body will only turn to protein and muscle tissue as a fuel source under extreme circumstances, such as during prolonged endurance workouts or when carbohydrate stores are depleted.
Interval training, which alternates between high-intensity bursts and steady states, has been found to be particularly effective for burning fat. A study by the University of New South Wales showed that this type of training resulted in more fat loss in a shorter amount of time compared to continuous cardio exercise.
Overall, incorporating cardio into your fitness routine can be a great way to burn excess calories and promote weight loss, especially when combined with a balanced diet and weight training.
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Cardio improves insulin sensitivity
Several studies have demonstrated the positive effects of cardio on insulin sensitivity. One study found that eight weeks of aerobic training, performed for one hour, three times a week, improved insulin sensitivity in the brain among adults with obesity. Another study by Prior et al. reported that increases in capillarisation correlated with improvements in insulin sensitivity following six months of aerobic exercise in older adults with impaired glucose tolerance. Additionally, a study by Duncan et al. found that six months of exercise, with or without weight loss, improved insulin sensitivity and plasma lipase activity.
The impact of cardio on insulin sensitivity is believed to be mediated by diminished body weight and/or adiposity. However, some studies suggest that the improvements in insulin sensitivity may be due to exercise-induced weight loss rather than the exercise itself. Nonetheless, it is well-established that acute exercise is associated with substantial improvements in insulin sensitivity, independent of changes in cardiorespiratory fitness or body composition. Higher-intensity interval training (HIIT) has been found to produce greater benefits on whole-body insulin sensitivity, although the findings on the effectiveness of HIIT are not unanimous.
Overall, cardio exercises, such as running, swimming, and cycling, can be beneficial for improving insulin sensitivity and reducing the risk of related health conditions. This, in turn, can lead to improved metabolism, reduced hunger, and weight loss, making it a valuable component of a holistic health and fitness routine.
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Cardio is good for heart health
Cardio exercises are an effective way to strengthen your heart and improve your overall heart health. The heart is a muscle, and like other muscles in the body, it can benefit from regular exercise. Cardio workouts help to improve circulation and lower resting blood pressure and heart rate, reducing the risk of heart disease, heart attacks, and strokes.
Regular cardio exercises can also help to preserve the "youthfulness" of your heart, keeping it strong and healthy over the course of your life. It is recommended to engage in at least 150 minutes of moderate-intensity cardio exercise per week, such as walking, cycling, or swimming. You can also incorporate everyday activities such as gardening or playing with children, as these can provide similar benefits.
In addition to improving heart health, cardio exercises are also beneficial for weight management and can help to lower cholesterol levels. Research has shown that cardio workouts can increase muscle mass and improve insulin sensitivity, which is important for processing and utilizing carbohydrates efficiently.
It is important to note that a balanced exercise routine should include both cardio and strength training. Strength training helps to improve muscle strength and bone strength, which can help prevent injuries and improve overall health. By varying the types and intensities of exercises, you can work different muscle groups and avoid overuse injuries.
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Frequently asked questions
Cardio does not eat muscle. Research from the Department of Health Sciences at Mid Sweden University found that cardio can increase muscle size.
Cardio can help increase muscle mass by increasing the number of capillaries that network through your muscles, optimising the pathways your body uses to repair the damage dealt by your weights work.
Research suggests that 30-45 minutes of cardio a few times a week can help increase muscle mass, provided you are eating enough food to fuel your workouts.
Interval training may be the most effective style of cardio exercise to increase muscle mass in the shortest amount of time.
It is important to refuel with a fast-digesting carbohydrate source after an intense cardio workout to replenish your carbohydrate stores and prevent your body from using muscle as an energy source.
