Logan Steele
Muscle mass is the amount of muscle in your body and is important for mobility, balance, and strength. It is a part of your lean body mass, which includes muscle, skin, bone, water, and organ mass. While there are no specific guidelines for what a healthy muscle mass percentage is, it is generally recommended to maintain a higher muscle mass as you get older, as this can help prevent injuries, chronic diseases, and early death. Healthcare professionals use expensive medical equipment to determine body composition and muscle mass, but there are also at-home methods to estimate muscle mass percentage.
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What You'll Learn
Muscle mass and body composition
Muscle mass refers to the weight and size of the smooth muscle tissue in your body. It includes skeletal, smooth, and cardiac muscles. Skeletal muscle helps control physical movement and posture, smooth muscle contracts autonomously, and cardiac muscle makes up the main tissue of the heart's walls.
Body composition is the amount of fat, bone, and muscle in your body. It also includes water and, depending on the definition, may include other fluids, gases, and acids. The term is mainly used in physical fitness because weight alone may not be a good indicator of health. For example, someone with a high BMI may still be lean and healthy because they have a high level of muscle mass.
Healthcare professionals recommend maintaining a higher muscle mass. As you get older, you naturally begin to lose muscle mass, a process called sarcopenia. This age-related muscle loss most commonly begins at age 40, and you may continue to lose up to 8% of muscle mass every decade. Losing muscle mass can reduce physical function and increase your risk of falls, injuries, metabolic conditions, and early mortality.
There are no specific guidelines for what a healthy or normal muscle mass percentage should be. However, a healthy body fat percentage can be a useful indicator of overall body composition. A healthy body composition includes a low proportion of body fat and a higher proportion of fat-free mass.
Calculating the percentage of muscle mass can help a person monitor or maintain their health. It is difficult to calculate muscle mass precisely without specialist equipment, but a person can start to estimate the figure by calculating their body fat percentage and then subtracting that number from 100.
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The importance of skeletal muscle
Skeletal muscle is one of the three types of vertebrate muscle tissue, the others being cardiac and smooth muscle. Skeletal muscles are under voluntary control, meaning you decide how and when they work. They are attached to bones by tendons and make up 30% to 40% of your total body mass.
Skeletal muscle is important for several reasons. Firstly, it helps control physical movement and posture, allowing you to perform a wide range of functions. Secondly, maintaining strong and healthy skeletal muscles can reduce the risk of injury, chronic disease, and early death. Thirdly, building muscle mass through exercise can have mental health benefits, such as improving symptoms of depression. Additionally, having a higher percentage of muscle mass contributes to a healthy weight by lowering body fat percentage.
As people age, they naturally begin to lose muscle mass, a process called sarcopenia. This age-related muscle loss commonly starts at 40 years old, with a possible loss of up to 8% of muscle mass per decade. Therefore, it is crucial to focus on building and maintaining muscle strength, especially for older adults.
To summarise, skeletal muscles play a vital role in everyday activities, and keeping them strong and healthy can improve overall physical and mental well-being. Additionally, maintaining a higher muscle mass percentage can help prevent age-related muscle loss and promote a healthier body composition.
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How to measure muscle mass
Muscle mass is important for daily functioning, especially for older adults. It is a part of your lean body mass, which includes muscle mass, bone, skin, water, and organ mass. While it is challenging to calculate lean body mass, determining muscle mass is even more difficult. The most accurate methods are expensive, and there is limited reliable data proving their accuracy.
Healthcare professionals usually measure body composition to determine muscle mass. Imaging tests, such as MRI scans, are considered the "gold standard" for measuring muscle mass. However, these methods are costly and inaccessible to many.
There are alternative ways to estimate muscle mass at home, although their accuracy is questionable. One common method is to calculate body fat percentage and subtract it from 100. This can be done using body fat scales, which estimate body fat by sending a slight electrical charge through the body. Other methods include the United States Navy's system, which involves measuring the circumferences of various body parts, and bio-impedance, which is the cheapest but least accurate option.
It is important to note that there are currently no specific guidelines for what constitutes a healthy or normal muscle mass percentage. However, healthcare professionals generally recommend maintaining a higher muscle mass as it offers various benefits, including improved metabolism, protection against falls and illnesses, and reduced risk of injury, chronic disease, and early death.
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The benefits of healthy muscle mass
While there are currently no specific guidelines for what constitutes a healthy muscle mass percentage, it is generally recommended to maintain a higher muscle mass. This is because muscle mass plays a crucial role in overall health and wellness.
Firstly, muscle mass is important for daily functioning, especially as we age. As we get older, we naturally begin to lose muscle mass, a condition known as sarcopenia. This can make everyday activities, such as walking or climbing stairs, more difficult and increase the risk of falls and injuries. Maintaining healthy muscle mass can help prevent this decline in physical function and improve mobility, balance, and stability.
Secondly, muscle mass contributes to metabolic health. A higher percentage of muscle mass increases the resting metabolic rate, leading to a higher calorie burn. Additionally, muscle mass is associated with better insulin sensitivity, reducing the risk of metabolic conditions such as type 2 diabetes.
Thirdly, muscle-building exercises have mental health benefits. Research suggests that resistance or strength training can improve symptoms of anxiety, depression, and self-esteem.
Furthermore, healthy muscle mass promotes bone health. Strength training increases bone density, leading to stronger bones and a reduced risk of fractures.
Finally, maintaining muscle mass can enhance your appearance, improve sports performance, and reduce the relative muscular demands of specific tasks.
In summary, healthy muscle mass is essential for physical function, metabolic health, mental well-being, bone health, and overall quality of life. While calculating muscle mass percentage can be challenging without specialised equipment, it is important to monitor and maintain muscle mass through appropriate exercise, nutrition, and lifestyle habits.
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Losing muscle mass
While it is important to maintain a healthy muscle percentage, losing muscle mass is a common occurrence, especially as people age. This natural process is known as sarcopenia, and it typically begins around the age of 40, with individuals potentially losing up to 8% of their muscle mass every decade thereafter. The rate of muscle loss can vary, and certain factors can contribute to an accelerated decline in muscle mass.
One of the primary causes of muscle loss is physical inactivity or disuse of muscles. When muscles are not regularly engaged, the body reduces the energy allocated to their maintenance, leading to muscle atrophy or wasting. This can be exacerbated by an unhealthy diet, with adequate protein intake being crucial for muscle maintenance and synthesis. Additionally, chronic diseases such as COPD, kidney disease, diabetes, cancer, and rheumatoid arthritis can increase the risk of muscle loss.
The symptoms of muscle atrophy include a decrease in muscle mass, limbs appearing smaller or thinner than the other, and numbness, weakness, and tingling sensations in the limbs. These symptoms can lead to difficulties in daily life, such as trouble walking or balancing, and increased risk of falls and injuries.
To combat muscle loss, it is essential to prioritize physical activity and exercise. Regular engagement in resistance or strength training exercises can help maintain and build muscle mass. Additionally, ensuring adequate protein intake is vital, with research suggesting that increasing protein consumption beyond current recommendations may significantly impact muscle mass retention and growth, particularly in older adults.
It is worth noting that calculating muscle mass percentage can be challenging and often requires specialized equipment. However, maintaining and building muscle mass is crucial for overall health, functionality, and independence, especially as individuals age.
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Frequently asked questions
Muscle mass is the amount of muscle in your body. It refers to the weight and size of the smooth muscle tissue in your body, including skeletal, smooth, and cardiac muscles.
There are currently no specific guidelines for what a healthy or normal muscle mass percentage should be. However, a healthy body fat percentage can be a useful indicator of overall body composition. Maintaining a higher muscle mass is generally recommended by healthcare professionals.
The most accurate ways to measure muscle mass involve expensive medical equipment, such as MRI scans or DEXA scans. It is also possible to estimate muscle mass percentage at home by calculating body fat percentage and subtracting that number from 100.
