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Cardio, or aerobic exercise, is often believed to cause muscle atrophy, or the wasting and thinning of muscle mass. However, this is a common misconception. While long, steady-state cardio training can waste muscle when done improperly or for too long, it does not have a negative impact on muscle mass when done correctly and can even be beneficial for muscle growth. In fact, cardio can improve muscle quality and protect against losing muscle innervation capability, making it an excellent way to improve overall health.
| Characteristics | Values |
|---|---|
| Does cardio atrophy muscle | No, cardio does not atrophy muscle. However, it can negatively impact muscle growth if done improperly. |
| Cardio and muscle growth | Cardio can be beneficial for muscle growth when integrated correctly into a training program. |
| Cardio and muscle atrophy prevention | Cardio can help prevent muscle atrophy by improving muscle quality and safeguarding against losing muscle innervation capability. |
| Cardio and muscle atrophy treatment | Cardio can be used as a treatment for muscle atrophy, especially when combined with resistance training. |
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What You'll Learn
Cardio and muscle atrophy: the role of exercise
Cardio, or aerobic exercise, has been a topic of debate in the fitness world, especially regarding its impact on muscle atrophy and growth. While some believe that cardio may lead to muscle wasting, recent studies and scientific research suggest otherwise. In fact, when performed correctly, cardio can offer several benefits for overall health and even support muscle growth.
Firstly, it is important to understand muscle atrophy and its causes. Muscle atrophy refers to the wasting or thinning of muscle mass, resulting in a decrease in muscle size and strength. It can be caused by various factors, including muscle disuse or inactivity, neurogenic conditions, malnutrition, age, genetics, and certain medical conditions. Physiologic atrophy, also known as disuse atrophy, occurs when muscles are not used enough, while neurogenic atrophy is caused by nerve problems or diseases.
Contrary to popular belief, cardio does not burn muscle tissue or cause muscle atrophy when done properly. Several studies have shown that long, steady-state cardio training does not negatively impact muscle mass. For example, a 2012 meta-analysis found that improperly combining cardio and lifting impairs muscle growth and strength gains. However, when cardio and lifting workouts are appropriately separated, they can be optimised for muscle growth. A 2017 study published in the Journal of Sports Science Medicine found that performing a moderate-intensity cycling session 24 hours after a biceps workout resulted in a significant increase in muscle hypertrophy compared to doing cardio before lifting weights.
Additionally, cardio can have positive effects on muscle quality and strength. Cardio and aerobic activity have been shown to improve muscle quality, protect against losing muscle innervation capability, and maintain strength in both younger and older individuals. A long-term study comparing sedentary and aerobically trained individuals across different age groups found that grip and knee extensor strength increased significantly in the trained group, suggesting that aerobic activity can prevent strength loss and even increase muscle protein synthesis and hypertrophy. Furthermore, a six-month intervention study involving middle-aged men who took up jogging found a 20% increase in mitochondrial density in type II muscles, further highlighting the benefits of cardio for muscle health.
While cardio itself does not burn muscle tissue, combining aerobic activity with a low-calorie diet can lead to a reduction in lean muscle mass. However, this is not solely due to aerobic exercise but rather the combination of caloric restriction and any form of exercise. Interestingly, aerobic exercise combined with resistance training has been found to be more effective than strength training alone in reducing body fat percentages, which is why bodybuilders often incorporate treadmill workouts during pre-competition cutting periods.
In summary, cardio, when integrated correctly into a training program, can be beneficial for overall health and muscle growth. It improves muscle quality, strength, and hypertrophy while also increasing fat loss. By optimising the timing and intensity of cardio sessions in relation to other workouts, individuals can maximise their fitness gains and avoid potential negative impacts on muscle growth.
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Cardio and muscle atrophy: the impact of diet
Cardio is an excellent way to improve your health and increase fat loss. It can even be beneficial for muscle growth when performed correctly. However, when cardio is done improperly, it can negatively impact muscle growth. For instance, a 2012 meta-analysis showed that improperly combining cardio and lifting impairs muscle growth by about 31% and strength gains by 18%. Therefore, it is important to integrate cardio into your training regimen correctly.
One of the most common mistakes is doing cardio at the wrong time. For instance, doing cardio before lifting weights can decrease your workout performance. A 2016 study showed that participants who performed a 20-minute cardio session before lifting weights experienced a significant decrease in their performance. Instead, it is recommended to do cardio after your weights workout.
Another mistake to avoid is combining cardio and lifting workouts. A 2017 study found that performing a 30-minute moderate-intensity cycling session 24 hours after a biceps workout resulted in an almost two-fold increase in muscle hypertrophy compared to doing the cycling session immediately after the biceps workout. This is likely due to systemic factors interfering with muscle hypertrophy when cardio is performed after a workout, which induces muscle damage. Therefore, it is optimal to separate cardio and lifting workouts to maximize muscle growth.
Finally, nutrition is an important factor in regulating muscle mass. A healthy diet can help prevent and treat muscle atrophy by suppressing the breakdown of muscle protein. Consuming an adequate amount of calories, protein, and other nutrients is crucial for maintaining and improving muscle properties. However, a short-term high-fat diet can accelerate disuse atrophy and protein degradation, as seen in studies on mice. Therefore, adopting an appropriate dietary strategy is essential to preventing muscle atrophy and promoting muscle growth.
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Cardio and muscle atrophy: the effect of age
Cardio is an excellent way to improve your health and increase fat loss. It can also be beneficial for muscle growth when done correctly. However, when performed improperly, it can negatively impact muscle growth. For instance, a 2016 study showed that participants who performed a 20-minute cardio session before lifting weights experienced a significant decrease in their workout performance.
The amount of time it takes for muscles to atrophy depends on age, fitness level, and the cause of atrophy. Physiologic or disuse atrophy occurs when muscles are not used enough, and it can start within two to three weeks of inactivity. Physiologic atrophy is more likely to occur with age, as older people experience a bigger drop in fitness during a break from exercise. A 2000 study found that older participants (aged 65-75) experienced a progressive decrease in the number of cell bodies in spinal cord sections compared to younger participants (aged 20-30).
Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases. It may develop sooner depending on one's health condition. Age-related neurogenic atrophy can be caused by an injury or disease affecting the nerves that connect to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions needed to stimulate muscle activity.
To prevent muscle atrophy, it is essential to maintain physical activity and a healthy diet. Even if you are taking a break from intense workouts, keeping up a minimum level of activity, such as cardio, can help prevent muscle loss.
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Cardio and muscle atrophy: neurogenic atrophy
Cardio is an excellent way to improve health and increase fat loss. It can even be beneficial for muscle growth. However, when performed improperly, it can negatively impact muscle growth. For instance, a 2012 meta-analysis showed that incorrectly combining cardio and lifting impaired muscle growth by about 31% and strength gains by 18%. Similarly, a 2016 study found that participants who performed cardio before lifting weights experienced a significant decrease in their workout performance.
Neurogenic atrophy is caused by nerve problems or diseases. It can be caused by an injury to or disease of a nerve that connects to the muscle. This type of atrophy can occur more suddenly than physiologic atrophy. Examples of diseases affecting the nerves that control muscles include Amyotrophic Lateral Sclerosis (ALS), also known as Lou Gehrig's disease, and carpal tunnel syndrome.
Neurogenic atrophy can lead to muscle atrophy, which is the wasting or thinning of muscle mass. Symptoms of muscle atrophy include a decrease in muscle mass, weakness, and numbness or tingling in the limbs. If muscle atrophy occurs in the face or throat, it can cause difficulty speaking or swallowing.
To diagnose muscle atrophy, a healthcare provider will perform a physical exam and ask about symptoms. They will measure muscle mass and may order additional tests, such as blood tests, muscle or nerve biopsies, and imaging scans.
While disuse atrophy can often be reversed with exercise and a healthy diet, neurogenic atrophy may require more specialized treatment. Treatment options for neurogenic atrophy may include physical therapy, ultrasound therapy, or, in some cases, surgery.
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Cardio and muscle atrophy: preventing muscle loss
Muscle atrophy is the thinning or wasting of muscle tissue, resulting in a decrease in muscle mass and strength. It can be caused by muscle disuse, malnutrition, ageing, genetics, or certain medical conditions. Physiologic atrophy, caused by insufficient muscle activity, can often be reversed with exercise and a healthy diet.
Cardio, or aerobic exercise, does not burn muscle tissue or cause muscle atrophy when performed correctly. In fact, cardio can improve muscle quality and safeguard against losing muscle innervation capability, even increasing muscle protein synthesis and hypertrophy. However, improperly combining cardio and lifting can impair muscle growth and strength gains. For example, performing cardio before a lifting workout can decrease performance, while moderate-intensity cardio performed 24 hours after a lifting session can increase muscle hypertrophy.
To prevent muscle loss, it is important to maintain a consistent level of physical activity. Both athletes and non-athletes can start losing muscle strength within three weeks of inactivity. While skeletal muscle strength remains stable during a month of no exercise, cardio endurance can decrease within a few days. Therefore, it is recommended to keep up a minimum level of activity, even during periods of reduced exercise capacity.
For those with muscle atrophy, exercise therapy can help increase muscle strength and improve aerobic exercise ability. Aerobic exercise, such as treadmill training, has been shown to improve muscle strength and motor function in patients with muscle atrophy. Additionally, exercises performed in a swimming pool can reduce the muscle workload during rehabilitation. A healthy diet that provides adequate calories and protein is also essential for preventing and reversing muscle atrophy.
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Frequently asked questions
Cardio does not atrophy muscle. In fact, cardio can be beneficial for muscle growth and can improve muscle quality. However, when done improperly, it can negatively impact your gains.
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, malnutrition, age, genetics, or certain medical conditions.
Symptoms of muscle atrophy include a decrease in muscle mass, one limb being smaller than the other, and numbness, weakness, and tingling in the limbs.
Muscle atrophy can often be reversed with exercise and a healthy diet. Swimming and other aquatic exercises are often recommended to reduce the muscle workload during rehabilitation.
The time it takes for muscles to atrophy depends on various factors, including age, fitness level, and cause of atrophy. Physiologic atrophy can occur within two to three weeks of muscle disuse, while neurogenic atrophy may develop sooner depending on the health condition.
