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Muscle density is defined as the mean attenuation coefficient of muscle tissue within the fascial plane, excluding intermuscular and visible intramuscular adipose tissue. It is expressed in Hounsfield units (HU), with higher attenuation indicating decreased muscle density. There are various ways to calculate muscle density, including medical equipment, body fat percentage calculations, and measuring certain areas of the body. Medical equipment such as MRI scans, computed tomography (CT) scans, and dual-energy X-ray absorptiometry (DXA) scans can provide accurate measurements of muscle density. Body fat percentage calculations, such as skinfold thickness measurements or bioelectrical impedance analysis, can also be used to estimate muscle density. Additionally, specific formulas like the Boer formula consider factors such as weight, height, and gender to calculate lean body mass, which includes muscle mass.
| Characteristics | Values |
|---|---|
| Muscle density definition | The mean attenuation coefficient of muscle tissue within the fascial plan (excluding intermuscular and visible intramuscular adipose tissue) |
| Muscle density expression | Hounsfield units (HU), with higher attenuation indicating decreased muscle density |
| Muscle density calculation | Computed tomography (CT) scans, whole-body dual x-ray absorptiometry (DXA) scans, bioelectrical impedance analysis, skinfold thickness measurements, hydrodensitometry or underwater weighing, magnetic resonance imaging (MRI) |
| Factors influencing muscle density | Sex, age, BMI, race, and gender |
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What You'll Learn
Using medical equipment like MRI scans
Magnetic resonance imaging (MRI) is a useful medical tool for directly measuring muscle volume and quality. MRI scans can be used to understand the associations between muscle and anthropometric traits, and health conditions.
MRI scans can be used to calculate muscle mass percentage, which is a useful metric for reducing the risk of age-related muscle loss. This can be done by creating MRI phantoms that cover a wide density range, which can then be used to estimate patient mass density. MRI scans can also be used to calculate the fat fraction in muscles, which is an important indicator of muscle quality.
MRI scans can be used to measure muscle volume, including total muscle volume, iliopsoas muscle volume, and thigh and mid-thigh muscle volume. They can also be used to measure muscle quality, including thigh intermuscular adipose tissue (IMAT) volume, mid-thigh IMAT volume, and paraspinal muscle proton density fat fraction (PDFF). By correcting for muscle volume in the mid-thigh, the mid-thigh IMAT/muscle ratio can be calculated, which is a useful indicator of muscle quality.
MRI scans can also be used in conjunction with other tools, such as peripheral quantitative computed tomography (pQCT) and dual X-ray energy absorptiometry (DXA), to assess skeletal muscle size and quality. This can be particularly useful for understanding the changes that occur in the body over time, as well as in response to targeted interventions.
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Calculating body fat percentage
There are several methods to calculate body fat percentage, each with its pros and cons. The most suitable method for you will depend on your personal preferences, budget, and access to equipment and expert services.
Body Fat Calculators
Body fat calculators are the easiest method as they require no special tools or lengthy appointments with specialists. You can use an online body fat calculator, or buy a set of skinfold calipers online for as little as £4 to £10. These calipers are used to pinch the skin and pull the fat away from the muscle, measuring fat underneath the skin (subcutaneous fat) at certain places on your body. You can also use a basic tape measure to manually take body circumference measurements, such as your neck, waist, and hip circumference. The U.S. Navy Body Circumference method, for example, only requires waist and hip circumference measurements for men, and adds a neck circumference measurement for women. The accuracy of this method is around 3.5% for most people.
Smart Scales
Smart scales can provide an instant estimate of your body fat percentage. These can be pricey, but cheaper models are available for around £25. However, smart scales are not suitable for those with pacemakers.
Hydrostatic Weighing
Hydrostatic weighing, also known as underwater weighing, measures your body density, which is then used to estimate how much fat you have. This is because fat is less dense than bone and muscle, so someone with a higher percentage of fat will weigh less under water and float more easily. While this method offers highly accurate results, it is not suitable for elderly people or children, and most tanks are located at universities or research institutions, making them hard to access and potentially expensive.
Other Methods
Other accurate means of measuring body fat include Dual-Energy X-ray Absorptiometry (DEXA) and Air-Displacement Plethysmography (used in a scan called 'BOD POD'), but these can be expensive and inconvenient.
Body Mass Index (BMI)
BMI is a widely used tool in the medical community that evaluates your body size and helps determine if your weight falls into a healthy range. It is calculated using your weight and height. However, it is important to note that BMI is not a percentage of body fat but a general score, and does not account for several factors such as body composition, ethnicity, race, gender, and age.
Healthy Body Fat Percentages
According to the American Council on Exercise (ACE), the healthy body fat percentage range for women is generally 21 to 35 percent, and for men, it's 8 to 24 percent, depending on age. The healthy range can also vary depending on other factors such as gender, ethnicity, and age. For example, the amount of essential fat (necessary fat that maintains life and reproductive functions) differs between men and women, with men typically having 2-5% and women 10-13%.
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Measuring body parts like skinfold thickness
To measure skinfold thickness, a tester pinches the skin at a specific location and pulls the fold of skin away from the underlying muscle, so only the skin and fat tissue are being held. Special skinfold calipers are then used to measure the skinfold thickness in millimetres. Two measurements are taken and then averaged. The most common sites for these measurements are the triceps, biceps, subscapular, and suprailiac. However, other sites include the abdomen, midaxilla, pectoral area, quadriceps, and
It is important to note that there are many different formulas and calculations to convert raw skinfold thickness values into a percentage of body fat. These calculations use population-specific or generalised equations derived from empirical relationships between skinfold thickness and body density. For example, the Brozek et al. (1963) and the Siri (1961) equations can be used to calculate body density, which can then be used to estimate body fat percentage.
The skinfold method is widely used, especially in children, as it is simple and does not require expensive equipment. However, it is important to recognise that the reliability of the measurements decreases with increasing thickness, and accuracy and precision are poorer in obese individuals. Additionally, skinfold testing is a skill that requires practice, and measurements can be influenced by factors such as skin tension and hydration level.
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Using bioelectrical impedance analysis
Bioelectrical Impedance Analysis (BIA) is a method for estimating body composition, specifically body fat and muscle mass. It involves passing a weak electric current through the body and measuring the voltage to calculate the body's impedance (resistance and reactance). This is based on the fact that different bodily tissues (e.g. muscle, fat, bone) have varying water content, resulting in different electrical conductivities. Lean tissues, such as muscle, are highly conductive due to their high water content, while bone and adipose tissue are poor conductors.
BIA devices use straightforward technology to measure the rate at which a painless, low-level electrical current travels through the body. Fat is more resistant than muscle or water, so a higher resistance indicates a higher body fat percentage. Most BIA devices estimate total fat, muscle, water, and bone in weight and percentage, using additional data such as height, gender, and weight measurements.
There are different types of BIA devices, such as hand-held, foot-to-foot, and leg-to-leg machines, but each requires two contact points. Hand-held devices, for example, use the two hands as contact points, while foot-to-foot devices use the two feet. The four-electrode (tetra-polar) technique is generally considered more accurate than the two-electrode method as it measures impedance between a separate pair of proximal electrodes, avoiding the impedance of the skin-electrode interface. Multiple-electrode devices can measure body segments simultaneously and are available in newer models.
While BIA is a popular method for estimating body composition, it has limitations in terms of accuracy. Individual characteristics such as body weight, hydration level, recent exercise activity, and food or drink intake can affect BIA readings. BIA may be less accurate for people with obesity or after intense exercise, and it may not be suitable for athletes or specific populations. Additionally, BIA devices can vary in quality and accuracy, and the environment, ethnicity, and underlying medical conditions can influence results. Despite these limitations, BIA provides a quick, non-invasive, and inexpensive way to estimate body composition and track changes over time.
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Computerized tomography (CT) scans
One of the key advantages of using CT scans for muscle density calculations is their ability to provide precise measurements of muscle morphology and function. This is especially important in the context of conditions like muscle atrophy, also known as muscle wasting, which can be caused by various factors such as inactivity, malnutrition, and certain diseases. By quantifying muscle density and other related parameters, CT scans can help in the early detection and monitoring of such conditions.
The process of calculating muscle density using CT scans typically involves several steps. Firstly, cross-sectional images of the relevant muscle groups are obtained using CT scanners. These images are then analysed using specialised software to measure the muscle density in Hounsfield units (HU). The analysis may involve segmenting the muscle groups, calculating mean radiodensity, and comparing these values with reference values to determine any deviations from the norm.
It is important to note that calibration of CT scanners is crucial for accurate muscle density measurements. Factors such as the use of calibration phantoms, standardisation of terminology, and consideration of potential water calibration offsets are essential to ensure the reliability and accuracy of the results. Additionally, the use of CT scans in combination with other imaging techniques, such as magnetic resonance imaging (MRI), can provide complementary information and improve the overall accuracy of muscle density calculations.
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Frequently asked questions
There are a few ways to estimate muscle density at home. One way is to use an online lean body mass calculator, which will subtract your weight from body fat from your total weight. Another way is to use a body fat scale, which calculates the amount of fat by sending an electrical current through the body. A third way is to use skinfold calipers to measure the thickness of skinfolds at various points on the body and then put these numbers into a conversion table or calculator for lean body mass.
The most accurate ways to calculate muscle density involve expensive medical equipment, such as an MRI scan, CT scan, or DXA scan.
Muscle density is associated with sex, age, and BMI.
