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Muscle atrophy, or muscle loss, is a common concern for many, especially those who are unable to exercise due to injury, illness, or other circumstances. The rate at which muscle loss occurs depends on various factors, including age, sex, fitness level, diet, and the duration of inactivity. On average, muscle loss can begin within 10 to 14 days of inactivity, with a one percent loss of muscle mass in a year for individuals who do not engage in any formal exercise. Older individuals are more susceptible to muscle loss, with adults losing 5-7 pounds of muscle per decade if they do not strength train. However, it's important to note that muscle memory allows individuals to regain muscle mass and strength more quickly after a period of inactivity, especially in athletes.
| Characteristics | Values |
|---|---|
| Definition | Muscle atrophy is the wasting or thinning of muscle mass. |
| Cause | Muscle loss is caused by disuse of muscles or neurogenic conditions. |
| Symptoms | Reduced muscle mass, weakness in arms and legs, numbness or tingling in arms and legs, trouble walking or balancing, difficulty swallowing or speaking, facial weakness, gradual memory loss. |
| Risk Factors | Leading a sedentary lifestyle, malnutrition, lack of exercise, desk jobs, old age, genetic disorders, strokes, injuries, illnesses, prolonged periods of inactivity. |
| Prevention | Resistance training, adequate protein intake, weight-bearing exercises, calisthenics, strength training, cardio, flexibility training, nutrition plans with increased protein and calorie intake. |
| Recovery | Muscle memory allows muscles to regain size and strength more quickly after a period of inactivity, especially in athletes. |
| Time Taken for Loss | Muscle loss can begin within 10-14 days of inactivity, with a one percent loss of muscle mass in a year for people weighing 150-200 pounds. Older individuals lose strength faster than younger ones, and adults lose 5-7 pounds of muscle per decade without strength training. |
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What You'll Learn
Muscle atrophy
The symptoms of muscle atrophy differ depending on the cause of the condition. The most obvious sign of muscle atrophy is reduced muscle mass. Other signs may include:
- One arm or one leg is smaller than the other.
- Weakness in one arm or leg.
- Numbness or tingling in the arms and legs.
- Trouble walking or balancing.
- Difficulty swallowing or speaking.
- Facial weakness.
- Gradual memory loss.
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using the muscles enough, and this type of atrophy can often be reversed with exercise and better nutrition. Pathologic atrophy is seen with aging, starvation, and diseases such as Cushing's disease. Neurogenic atrophy is caused by an injury or disease affecting nerves that connect to the muscles. When these nerves are damaged, they can't trigger the muscle contractions needed to stimulate muscle activity.
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Factors affecting muscle loss
Muscle atrophy is the loss or thinning of muscle tissue and mass. It can be caused by several factors, including:
Age
The natural ageing process can lead to a decrease in muscle mass and strength. This is known as sarcopenia, which is a type of muscle atrophy that specifically affects older people. The decline in hormone levels, such as testosterone and insulin-like growth factor (IGF-1), can affect muscle fibres and lead to sarcopenia. Additionally, as people age, their bodies produce fewer proteins that promote muscle growth, causing muscle cells to shrink.
Physical Inactivity
Not using muscles enough can lead to disuse (physiologic) atrophy. This can be due to a sedentary lifestyle, illness, injury, or health problems that limit movement. Inactivity causes the body to break down muscle tissue to conserve energy, resulting in a decrease in muscle size and strength.
Nutrition
Nutritional deficiencies, such as malnutrition or inadequate protein intake, can contribute to muscle atrophy. Malnutrition can also lead to conditions like starvation and Cushing disease, which are associated with muscle wasting.
Genetics
Genetic factors can play a role in muscle atrophy. Certain genetic disorders, such as muscular dystrophy, can cause a loss of motor nerve cells and progressive weakness and loss of muscle mass.
Medical Conditions
Various medical conditions can lead to muscle atrophy, including nerve problems or diseases (neurogenic atrophy). Examples include Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre Syndrome, carpal tunnel syndrome, spinal cord injuries, and multiple sclerosis. These conditions affect the nerves that control muscles, leading to muscle wasting.
It is important to note that muscle atrophy can be treated or reversed through lifestyle changes, physical therapy, and in some cases, surgery.
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Preventing muscle loss
Muscle loss, or sarcopenia, is a natural part of aging. It is a type of muscle atrophy that specifically affects people as they grow older. However, there are ways to prevent and slow down muscle loss.
Exercise
One of the most effective ways to prevent muscle loss is through exercise, specifically strength training or resistance training. Resistance exercises include weightlifting, pulling against resistance bands, or moving part of the body against gravity. Examples include leg presses and extending the knees against resistance on a weight machine. Progressive resistance training (PRT) involves gradually increasing the workout volume, such as weight, reps, and sets, as strength and endurance improve. This constant challenge helps build muscle and prevents plateaus. Sustained exercises that raise your heart rate, such as aerobic exercise and endurance training, can also help control muscle loss.
Nutrition
Nutrition also plays a crucial role in preventing muscle loss. Consuming adequate protein is essential, as it promotes muscle mass and strength. Healthy adults should aim for 10% to 35% of their daily calories from protein, with 25 to 30 grams of protein per meal. Good sources of protein include lean meat, poultry, fish, eggs, low-fat dairy, lentils, and beans. Additionally, creatine, a small protein made in the liver, can be added to the diet through meat or supplements to support muscle growth.
Sleep
Getting enough restorative sleep is another key factor in preventing muscle loss. Sleep helps reset the body and provides the energy needed for workouts. If you have trouble sleeping, it is important to address these issues, as lack of sleep can hinder muscle maintenance.
Caloric Intake
Ensuring a proper caloric intake is also important. Consuming more calories than you burn supports muscle growth and maintenance. A post-workout meal or drink with a carbohydrate-to-protein ratio of about three-to-one or four-to-one can maximize muscle growth and improve recovery. For example, chocolate milk, which has about 22 grams of carbs and 8 grams of protein, is a good option.
By combining these strategies, you can effectively prevent and slow down muscle loss, maintaining your strength, independence, and quality of life as you age.
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Muscle memory
Research supports the existence of muscle memory. A 2020 study by Snijders et al. found a linear relationship between muscle fibre size and the number of myonuclei in humans. Another study by Staron et al. in 1991 found that female participants regained muscle strength and fibre size during 6 weeks of retraining, compared to the initial 20 weeks it took to build strength. Similarly, a 2015 Danish study found that young, physically fit people who became immobile lost muscle strength more rapidly than older people.
It's important to note that muscle memory is not just about muscle growth. It is also related to learned motor skills and improved performance, which contribute to overall gains in mass. Additionally, the length of time that muscle memory lasts is uncertain, and factors such as age, sex, and food intake can influence muscle loss and retention. For example, older people tend to lose muscle strength faster than younger people, and a caloric deficit can lead to a decrease in muscle size.
While muscle memory can help you regain lost muscle, it doesn't eliminate the need for hard work, proper nutrition, and a structured plan when returning to training. However, it does provide a solid foundation for progress, making it easier to bounce back and get into the groove even after an extended break.
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Regaining muscle mass
Muscle atrophy, or muscle wasting, can be caused by several factors, including disuse, neurogenic conditions, malnourishment, leading a sedentary lifestyle, and age-related atrophy. The good news is that muscle mass can be regained, and even built upon, with the right strategies.
Firstly, it is important to consult a healthcare professional, especially if you are experiencing muscle atrophy due to an injury or surgery. They can advise you on a safe and effective plan to help you rebuild your muscle mass and strength.
For those who are older, it is recommended to maintain an exercise schedule that continually works the muscles. This can include scheduling times for walking throughout the day. When rebuilding atrophied muscles, it is important to start slowly and avoid intense training or exercise routines, especially if you are recovering from an injury or surgery. Isometric exercises are a great place to start, as they require no training equipment and focus on muscle contraction and relaxation. For example, you can contract your stomach muscles for 10 seconds, relax for 10 seconds, and repeat.
Once you are comfortable with isometric exercises, you can progress to mid-range exercises, which are between light isometric exercises and weight-bearing exercises. Holding a squat against a wall or a plank are examples of mid-range exercises. These exercises focus on contracting and relaxing one muscle group at a time. You can also try sitting down and contracting your quad muscle for 10 seconds on and 10 seconds off.
Finally, you can introduce weight-bearing exercises, starting with lighter weights and fewer reps, and gradually increasing the weight and number of reps over time. It is important to be cautious and not do too much too soon, as this could lead to re-injury. Aim for 8-12 reps with the weight you have chosen, and ensure the reps provide a challenge without being overly difficult.
In addition to these targeted exercises, yoga and strength training are also effective ways to regain muscle mass.
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Frequently asked questions
Yes, you lose cardio or aerobic fitness more quickly than muscle strength. According to a 2012 study, endurance decreases between 4% and 25% after a 3-4 week break in cardio.
Yes, muscle loss occurs faster with age. Older people experience a bigger drop in fitness. Adults lose an average of 5-7 pounds of muscle per decade if they don't strength train.
Muscle loss can occur if you stop working out, but it depends on several factors such as your fitness level, diet, and how long you remain inactive. Muscle atrophy can begin within 10-14 days of inactivity.
Yes, muscle loss can occur faster after an injury, illness, or any prolonged period of inactivity.
Athletes can start to lose muscle strength faster, in about three weeks if they're not working out. However, they can also regain their former muscle strength more quickly due to muscle memory.
