Logan Steele
Muscle mass percentage is an important indicator of health. It is associated with physical function, the ability to perform daily tasks, and longevity. While it is difficult to calculate muscle mass precisely without specialist equipment, it is possible to estimate the figure by calculating body fat percentage and subtracting that number from 100. Muscle mass naturally declines with age, with most men losing about 30% of their muscle mass during their lifetime, and this reduction in muscle mass, called sarcopenia, can start as early as age 30. However, it is possible to slow down muscle loss and protect physical ability through exercise and good nutrition. Strength training and resistance training are particularly effective in building muscle mass, while adequate protein intake is crucial for muscle growth and repair.
| Characteristics | Values |
|---|---|
| Definition | Muscle mass is the amount of soft muscle tissue in the body, including smooth and skeletal muscles. |
| Calculation | It is difficult to calculate muscle mass accurately without specialist equipment. One way to estimate muscle mass percentage is by calculating body fat percentage and subtracting that number from 100. |
| Importance | Muscle mass can be an indicator of health. It can help with maintaining a healthy weight, as a higher percentage of muscle mass means a lower percentage of body fat. It also reduces the risk of injury and increases bone density. |
| Loss | The natural aging process is the most common cause of muscle loss, which begins around age 30. People with sarcopenia lose muscle mass more quickly. |
| Prevention | It is possible to rebuild and maintain muscle with a progressive resistance training program and a higher-protein diet. Strength training or weight training is the best way to build muscle mass. |
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What You'll Learn
Muscle mass percentage and how to calculate it
Muscle mass refers to the amount of soft muscle tissue in the body, including smooth and skeletal muscles. Skeletal muscles are the only type of muscles that a person can voluntarily control, and they play a key role in movement, balance, and strength.
Calculating the percentage of muscle mass can be useful in monitoring and maintaining health, especially as adults age. Muscle mass is a part of lean body mass, which includes muscle mass, bones, bodily fluids, and other components. While it is challenging to calculate lean body mass, determining muscle mass is even more complex. The most accurate methods involve expensive medical equipment, such as MRI scans, which are not practical for most individuals.
There are alternative ways to estimate muscle mass percentage at home, although the accuracy of these methods is uncertain. Many online calculators and tools are available, but they often rely on calculating body fat percentage first and then subtracting that number from 100. Body fat percentage can be determined through body fat scales, which use bioelectrical impedance by sending an electrical current through the body. Another method recommended by the United States Navy involves measuring the circumferences of various body parts, with different values and heights representing various body fat percentages.
It is important to note that there are currently no specific guidelines for what a healthy or normal muscle mass percentage should be. However, maintaining a healthy percentage of muscle mass offers several benefits, such as reducing the risk of age-related muscle loss and improving overall physical function. Additionally, forms of exercise that build muscle, such as resistance or strength training, can also provide mental health benefits and increase bone density.
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The benefits of having strong and healthy muscles
Muscle mass declines with age, and this reduction is called sarcopenia. This can make everyday activities such as walking or climbing the stairs difficult. Sarcopenia is also associated with inflammation throughout the body, as well as bone disorders. However, it is never too late to build muscle through exercise and diet.
Facilitates weight control
The amount of lean muscle mass you have helps determine your resting metabolic rate, which significantly affects the number of calories you burn. The more muscle you have, the easier it is to maintain a desirable weight.
Improves bone health
Strength training not only makes your muscles stronger but also your bones. Studies suggest that heavy weight-bearing exercises can increase bone density and reduce the risk of fractures. This is especially important as you age, as bones naturally become less dense, increasing the risk of broken bones and osteoporosis.
Reduces the risk of injury
Stronger muscles can lower the risk of injury by improving your balance and posture. This is particularly beneficial for older adults, as it helps them maintain their independence and dignity.
Enhances psychological well-being
Research has shown that strength training can positively impact your anxiety, depression, and self-esteem. It can also help reduce the risk of Alzheimer's disease, a type of dementia that affects memory, thinking, and behavior.
Promotes functional fitness
Muscular strength improves your ability to perform daily tasks without undue fatigue. This includes activities such as carrying groceries, lifting and playing with children, and household chores.
Having strong and healthy muscles has numerous benefits that can improve your overall quality of life, both physically and mentally.
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Age-related muscle loss, also known as sarcopenia
Sarcopenia is a type of muscle atrophy primarily caused by the natural aging process. It commonly affects the elderly population and is believed to be caused by being physically inactive and consuming an unhealthy diet. Sarcopenia can also be caused by other health conditions, such as chronic obstructive pulmonary disease (COPD), kidney disease, diabetes, cancer, HIV, rheumatoid arthritis, insulin resistance, reduction in hormone levels, malnutrition, and inadequate protein intake.
The condition is characterized by a decrease in both the number and size of muscle fibres, leading to muscle thinning and weakness. Sarcopenia can cause a range of adverse outcomes, including increased disability, falls, and mortality. It may also lead to decreased immunity, poor wound healing, and increased vulnerability to stressors, known as the "frailty syndrome". An early indicator of the onset of sarcopenia is a significant loss of muscle mass in the anterior thigh and abdominal muscles.
The prevalence of sarcopenia is estimated to be between 5% and 13% in people aged 60 and older, increasing to 11% to 50% in people over 80. It is projected to affect over 200 million people in the next 40 years, making it a growing public health concern.
While sarcopenia is a natural part of the ageing process, there are ways to prevent and manage it. Regular physical activity, including resistance exercises such as weightlifting, push-ups, and using resistance bands, can help to increase muscle mass and prevent muscle loss. Additionally, consuming a healthy diet with adequate protein and calorie intake is crucial for muscle growth and preventing muscle atrophy.
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Ways to build and preserve muscle mass
Muscle loss, also known as sarcopenia, is a common part of aging, with muscle mass declining by about 3-5% per decade from the age of 30 onwards. This can result in greater weakness and reduced mobility, increasing the risk of falls and fractures. However, it is possible to effectively build and preserve muscle mass through a combination of exercise, nutrition, and healthy habits. Here are some ways to achieve and maintain a healthy muscle mass:
Strength Training and Progressive Resistance Training
Progressive resistance training (PRT) is a highly effective method to build and preserve muscle mass. This involves gradually increasing the volume, weight, repetitions, and sets of your workouts as your strength and endurance improve. Resistance training, such as strength training or weight training, forces your muscles to work against resistance, stimulating muscle growth. Aim for two to three 30-minute sessions per week, and consider joining community classes or working with a personal trainer to get started.
Aerobic Exercise
Aerobic exercise, such as jogging, dancing, or even just walking, is beneficial for muscle growth and repair. It enhances blood flow, improves your body's response to insulin, and slows age-related muscle loss. Taking regular walking breaks throughout the day, such as 10-minute walks, can be a simple way to incorporate aerobic exercise into your routine.
Nutrition and Protein Intake
Protein is essential for building and repairing muscle. Aim for a daily intake of 1 to 1.3 grams of protein per kilogram of body weight, especially if you are engaging in resistance training. Animal sources like meat, eggs, and milk provide a good balance of essential amino acids. However, it is advisable to opt for leaner choices, such as chicken or salmon, and avoid red and processed meat due to their high saturated fat and additive content. If you are unable to meet your protein requirements through diet alone, consider adding protein powders to your meals or shakes, providing about 30 grams of protein per scoop. Consuming a meal or drink with a carbohydrate-to-protein ratio of 3:1 or 4:1 within 30 minutes after your workout can also maximize muscle growth and improve recovery.
Calorie Surplus
In addition to protein, ensuring a calorie surplus in your diet is crucial for building muscle mass. This means consuming more calories than your maintenance level. These extra calories can come from carbohydrates, fats, or proteins, but it is important to prioritize sufficient protein intake (at least 1 gram of protein per kilogram of body weight) to provide the necessary building blocks for muscle growth.
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The impact of low muscle mass on physical ability
Muscle mass is a part of lean body mass, which also includes bone and other body components. Skeletal muscle, which is the type of muscle that a person can voluntarily control, plays a key role in movement, such as bending the arm, requiring the bicep muscle to contract and the triceps to relax.
Low muscle mass, or sarcopenia, is the age-related progressive loss of muscle mass and strength. Sarcopenia is primarily caused by the natural aging process, with muscle loss beginning at age 30 and continuing at a rate of 3 to 8% of muscle mass lost every decade. However, other factors such as physical inactivity, unhealthy diet, chronic diseases, rheumatoid arthritis, insulin resistance, and hormone level reduction can also contribute to sarcopenia.
To improve physical ability, it is important to focus on building and maintaining muscle mass through exercise and diet. Strength training or resistance training is particularly effective in building muscle mass by forcing the muscles to work against resistance. Additionally, consuming a sufficient amount of protein, ranging from 20 to 35 grams per meal, can help build and repair muscles.
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Frequently asked questions
Muscle mass is the amount of soft muscle tissue in the body, including smooth and skeletal muscles.
It depends on age, gender, and body composition. Generally, muscle mass declines with age, starting at around 30. However, it is never too late to build muscle through exercise and diet. Strength training and adequate protein intake are crucial for muscle growth and preservation.
While it is challenging to calculate muscle mass precisely without specialist equipment, you can estimate it by determining your body fat percentage and subtracting that number from 100. Low muscle mass can impact your physical function, increase the risk of injuries, and affect your overall health.
You can increase your muscle mass through strength training or weight training, aiming for two to three sessions per week. Additionally, ensure you are consuming enough protein, as it helps build and repair muscles. The recommended daily intake is 1 to 1.3 grams of protein per kilogram of body weight for those engaging in resistance training.
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