Dominic Stone
Cardio is often associated with burning muscle, but does it? The short answer is no. Cardio alone does not burn muscle tissue, but too much cardio can create a calorie deficit that may lead to muscle loss if not managed properly. To avoid this, it is important to understand target heart rate zones and how to integrate cardio into your training regimen. Nutrition and weight training also play crucial roles in maintaining and growing muscle mass. So, while cardio can be a beneficial part of your fitness routine, it should be complemented with a balanced diet and strength training to optimise muscle growth and retention.
| Characteristics | Values |
|---|---|
| Does cardio burn muscle? | No, cardio does not directly burn muscle. |
| How to avoid burning muscle while doing cardio? | Eat a nutritious diet, do weight training, and avoid excessive cardio. |
| Recommended cardio duration | 2-3 sessions per week, 20-45 minutes per session. |
| Recommended cardio type | Low-impact cardio such as cycling, rowing, or walking. |
| When to do cardio? | After weight training, ideally after a minimum gap of 6 hours. |
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What You'll Learn
Cardio and weight training can coexist in a workout routine
Cardio and weight training can absolutely coexist in a workout routine, and in fact, cardio can even help with muscle growth. However, there are some things to keep in mind to make sure that your cardio routine is not hindering your muscle growth.
Firstly, it is important to understand that cardio alone does not burn muscle tissue. This is a common misconception, and while cardio can burn muscle if done incorrectly, it is more likely that a lack of weightlifting or an inadequate diet is the problem. Cardio can actually improve muscle quality and protect strength in both younger and older individuals. It does this by increasing muscle protein synthesis and muscle hypertrophy.
Secondly, it is crucial to do cardio and weight training at the right times. If you do cardio before your weight training session, it can decrease your performance in the gym. It is recommended to do cardio after your weight training, or at least 6 hours before it. It is also important to keep your cardio sessions to 2-3 20-30 minute sessions per week if your main goal is to build muscle and strength.
Thirdly, it is important to monitor your diet. Building muscle means eating in a caloric surplus, giving your body enough fuel for protein synthesis. However, this does not mean that if you are in a deficit, you will automatically lose muscle. Even when in a caloric deficit, eating enough protein and lifting weights will help you maintain your muscle mass.
In conclusion, cardio and weight training can coexist in a workout routine, and cardio can even help with muscle growth when done correctly. It is important to separate cardio and weight training sessions, monitor your diet, and ensure you are getting enough protein and calories to fuel your workouts.
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Caloric surplus and weight training are important for building muscle
Cardio training does not directly burn muscle tissue. However, if you are not eating appropriately, too much cardio may indirectly create a calorie deficit that costs you muscle. For instance, aerobic exercise lasting longer than 75 minutes will deplete liver and intramuscular glycogen stores, causing amino acids to be used for fuel.
To build muscle, a caloric surplus is generally recommended. This is because a calorie surplus maximizes your body's ability to build lean mass. However, the surplus should be implemented correctly to avoid gaining excess body fat. It is recommended to start with a 5-10% increase in calories and monitor weight gain over a 2-week period. An appreciable rate of weight gain is between 0.25-0.5% per week.
In addition to a caloric surplus, weight training is crucial for building muscle. Most scientific studies agree that a muscle needs to be worked at least twice a week to see growth. Progressive overload, or increasing the difficulty of an exercise over time, is one of the most important principles of strength training. This can be achieved by increasing the weight, reps, depth, or intensity of an exercise.
Rest days are also important when building muscle. While it may be tempting to work out every day, muscles need time to recover. Split workouts, which focus on different muscle groups or types of exercises on consecutive days, are useful for giving certain muscles a rest while you work on others.
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Excess cardio may burn muscle, but only under certain conditions
Cardio training is a generic term for any exercise that gets the heart pumping. It is often associated with burning muscle because it helps burn calories, but this doesn't mean that cardio is the best way to lose fat. In fact, the data and science suggest that general cardio training does not burn muscle. However, excessive cardio may burn muscle, but only under certain conditions.
Firstly, if you are not eating appropriately, too much cardio may create a calorie deficit that costs you muscle. Building muscle means eating in a caloric surplus, giving your body enough fuel for protein synthesis. Even when eating in a deficit, sufficient protein and weight training can help maintain muscle mass. Extreme calorie restriction, whether from eating less, doing lots of cardio, or both, leads to muscle loss, especially without weight training.
Secondly, doing lots of cardio at the expense of proper weight training can burn muscle. Weight training builds muscle through microscopic damage inside the muscle and metabolic fatigue. Cardio can complement weight training by optimising the pathways your body uses to repair the damage dealt by weights work. However, too much cardio before weight training can hinder muscle growth. A 2016 study showed that participants who performed cardio before lifting weights experienced a significant decrease in their workout performance.
Thirdly, the type and duration of cardio matter. High-impact cardio, such as running and jumping, can hinder muscle growth. Moderate to high-intensity cardio, longer than 30 minutes, is best performed separately from weight training. A 2017 study found that performing a 30-minute cycling session 24 hours after a biceps workout almost doubled muscle hypertrophy compared to doing it immediately after.
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Cardio can be beneficial for muscle growth
Cardio, or cardiovascular exercise, is often associated with burning fat and calories, which can lead to a belief that it may hinder muscle growth. While excessive cardio can potentially impact muscle growth, when done correctly, it can actually be beneficial for muscle growth and overall physical performance.
Firstly, it is important to understand that muscle growth is a result of microscopic damage inside the muscle caused by resistance training activities, which are often a part of weightlifting routines. This process can be supported by the right amount of cardio, as it optimises the pathways for the body to repair this damage. Additionally, cardio increases the number of capillaries (small blood vessels) in the muscles, improving the transportation of oxygen, nutrients, and hormones to the muscles, which is essential for their growth and recovery.
Secondly, the idea that cardio burns muscle tissue is a misconception. While it is true that extreme endurance training can lead to muscle loss, moderate aerobic exercise does not eat muscle or reduce strength levels. In fact, it can improve strength and contribute to muscle growth, especially in middle-aged and older adults. A study comparing sedentary individuals to aerobically trained individuals in different age groups found that grip and knee extensor strength increased significantly more in the trained group, indicating that aerobic activity can prevent strength loss and even increase muscle protein synthesis and hypertrophy.
Furthermore, the timing and type of cardio matter when it comes to muscle growth. It is recommended to separate cardio and weightlifting workouts, performing cardio after lifting weights or at least six hours before. This ensures that the systemic factors from cardio do not interfere with muscle hypertrophy. Low-impact cardio, such as cycling, rowing, or incline walking, is ideal for preserving energy and recovery capacity for weightlifting sessions.
Finally, proper nutrition is crucial. While cardio can create a caloric deficit, which may indirectly impact muscle growth, consuming an adequate amount of calories, protein, and amino acids can prevent muscle catabolism. Weightlifting and a balanced diet that provides sufficient fuel for protein synthesis are key components of maintaining and growing muscle mass, even when doing cardio.
In conclusion, when integrated correctly, cardio can be a valuable tool for improving muscle growth, physical performance, and overall health.
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Heart rate zones and nutrition are important factors to consider
Heart rate zones are an important consideration when it comes to maximising the benefits of your workouts. They represent different percentages of your maximum heart rate and indicate the amount of effort your body is exerting. By understanding these zones, you can tailor your training to achieve optimal cardiovascular health and ensure you are working at the right intensity for your goals.
To calculate your maximum heart rate, you can use the formula 220 minus your age. From there, you can determine the various heart rate zones, which are as follows:
- Zone 1 (50-60% Max HR): This is the target zone for warm-ups, recovery, and light activity.
- Zone 2: This is the target range for base-level aerobic activities.
- Zone 3: This is the target heartbeat range for aerobic endurance activities.
- Zone 4: This is the target range for anaerobic activities.
- Zone 5: This zone is ideal for short burst speed training.
It's worth noting that while tracking your heart rate can be beneficial, it's not always necessary. If calculations become cumbersome, you can focus on how your body feels during exercise. Consult a healthcare professional for personalised advice.
In addition to heart rate zones, nutrition is a crucial factor. To build muscle, you need to eat in a caloric surplus, providing your body with sufficient fuel for protein synthesis. If you're in a caloric deficit, you can still maintain muscle mass by consuming enough protein and incorporating weight training or resistance training into your routine. This prevents muscle catabolism, the breakdown of muscle tissue for energy.
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Frequently asked questions
Cardio does not burn muscle if you are consuming an adequate amount of calories and protein, and doing weight training. However, if you are not eating enough calories and protein, and not doing weight training, cardio may burn muscle.
It is recommended to do 2-3 20-30 minute sessions of cardio per week if your goal is to build muscle. Keep cardio sessions under an hour to avoid burning muscle.
Low-impact cardio such as cycling, rowing, and rucking are recommended to avoid burning muscle.
It is recommended to do cardio after lifting weights, or at least 6 hours before lifting weights.
