Dominic Stone
Knowing how much muscle you have is an important part of understanding your overall health and fitness. While body mass index (BMI) is a quick and easy way to measure weight versus height, it does not differentiate between fat mass and muscle mass. To accurately measure muscle mass, you can use methods such as bio-impedance, the Bod Pod, DEXA, MRI, CT scans, and smart scales or calipers. These methods can provide a more detailed understanding of your body composition and help you track your progress in building muscle mass.
| Characteristics | Values |
|---|---|
| Muscle Mass Measurement | Body Mass Index (BMI), Magnetic Resonance Imaging (MRI), Computed Tomography (CT) scan, Dual-energy X-ray absorptiometry (DEXA), Bio-impedance, Bod Pod, Skinfold Calipers |
| Muscle Mass Definition | Skeletal muscle that can be strengthened and enlarged through exercise |
| Muscle Benefits | Burns more calories at rest than fat, improves strength, endurance, energy, and physical ability |
| Muscle-Building Nutrition | Adequate calories, high protein, balance of macronutrients (protein, carbohydrates, fat) |
| Muscle-Building Timeframe | Building muscle takes time, so progress should be measured over weeks or months |
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What You'll Learn
Using smart scales
Smart scales are an increasingly popular way to monitor your body weight and composition. They can be particularly useful for those who want to track their muscle mass. While standard scales only display weight, smart scales can provide a detailed breakdown of your body composition, including your muscle mass, body fat percentage, bone density, and other health stats.
Smart scales work by sending a small electrical current through your body, often through the feet and/or hands, and measuring the impedance or resistance to this current. Tissues with high water content, such as muscle and blood, transmit electric currents more easily than tissues with lower water content, such as fat and bone. These measurements are then fed into algorithms that calculate your body composition, taking into account self-reported metrics like age, sex, and height. This method, known as bioelectrical impedance analysis (BIA), is non-invasive and relatively inexpensive, but it is also prone to distortions.
Smart scales can be a great tool for athletes tracking muscle mass for performance and recovery, elderly individuals monitoring changes in bone density and muscle mass, and people with chronic conditions like heart disease or diabetes where body composition can impact management strategies. However, it's important to note that smart scales should not be treated as diagnostic devices. While they can provide valuable insights, they are not as accurate as clinically validated methods such as Dual Energy X-ray Absorptiometry (DEXA), which is considered the "gold standard".
When choosing a smart scale, look for one that tracks the data points that are most important to you, whether that's muscle mass, body fat percentage, bone mass, or other metrics. Consider the weight capacity, data storage capabilities, ease of use, and compatibility with your smartphone and apps. Some popular options include the ABLEGRID Smart Digital Bathroom Scale, the iHealth Nexus Pro Wireless Body Composition Scale, and the Wyze Scale X, which offers excellent value for money with 12 body metric tracking options.
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Bio-impedance
Bioelectrical Impedance Analysis (BIA) is a method of determining body composition by measuring the amount of fat, muscle, water, and bone in the body. It is a quick and easy way to get an estimate of your body composition, which is useful for weight management and tracking changes in your body over time.
BIA works on the principle that different tissues in the body allow electrical currents to travel at different speeds. Fat is more resistant than muscle or water, so the higher the resistance, the higher the body fat percentage. Lean body tissue, like bones and muscles, has a higher water and electrolyte content, making it more conductive, and allowing the electrical current to pass through it more easily.
However, it is important to note that BIA does not provide an accurate measurement of total body fat. It is also less accurate for people with obesity, and factors such as dehydration or a low-carb high-fat diet can cause the fat-free mass (muscle and bone) to be underestimated. Additionally, when we store glycogen in our muscles, we also store it with water, which can trick the machine into thinking there is a higher amount of fat mass.
Despite these limitations, BIA has made it possible to assess body composition in a matter of minutes, which was previously a complex and expensive process. It is a useful tool for understanding the proportions of fat and muscle in the body, which can inform dietary and lifestyle recommendations for weight management. BIA can be repeated every 2 to 4 weeks to monitor progress. However, it should be combined with other measurements and body composition analyses to develop a holistic programme for weight management.
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Bod Pod
The BOD POD is a highly accurate, easy, and affordable way to measure body composition. It is a popular service offered by the SMART Lab and is used extensively by the NFL, the military, and healthcare organisations. The BOD POD provides a measure of your muscle to fat ratio, an indicator of overall health, and is a great tool for tracking fitness improvements.
The BOD POD uses air displacement to measure body composition. It measures a person's body weight and volume to find their body density. It is based on whole-body air displacement plethysmography, a scientifically validated method for measuring human body fat percentage. The BOD POD consists of two chambers: the front, or Test Chamber, where the subject sits, and the rear, or Reference Chamber. The subject's body volume is calculated by measuring the interior volume of the empty BOD POD chamber, and then measuring it again when the subject is seated inside.
The BOD POD test takes about 5-10 minutes, and the subject sits comfortably inside the pod for 2-3 50-second testing periods. The BOD POD can accommodate subjects up to 7 feet tall and 550 pounds. It is important to wear minimal, form-fitting clothing during the test, such as a swimsuit or tight workout clothing, and a swim cap to compress any air pockets within the hair.
The BOD POD provides an accurate and comprehensive report of your body composition, including your fat and muscle mass (body fat percentage and lean mass percentage) and your estimated resting metabolic rate (RMR). This information can be used to make informed decisions about your health and fitness goals.
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Dual-energy X-ray absorptiometry
The process of undergoing a DXA scan typically involves taking initial measurements of height and weight, followed by a short scan while the patient lies comfortably on a scanning bed. The scan is usually completed within a few minutes, and the patient will then receive a consultation with an exercise specialist to discuss their results and receive personalized recommendations based on their specific goals, whether they are focused on fat reduction, muscle growth, or bone density improvement.
One of the advantages of DXA over other imaging techniques is its very low radiation dose, making it a safe option for patients. It also offers accuracy and simplicity of use, with good agreement between its measurements of fat and lean mass compared to those of CT and MRI scans. DXA scans can provide valuable information about an individual's body composition, which can be monitored over time through follow-up scans.
DXA scans have been validated in various studies, including those involving older women, obese men and women, and even dogs and cats. The technique has been continuously improved upon since its development, and it is now considered the standard reference for assessing bone mineral density and fracture risk. While it has been underutilized compared to bone mineral density measurements, DXA is a valuable tool for evaluating body composition and various musculoskeletal parameters.
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Magnetic resonance imaging (MRI)
MRI is commonly used to evaluate and diagnose various medical conditions, including sports injuries, work-related disorders, muscle injuries, and muscle pathologies. It can detect even very small tears and injuries to muscles, tendons, and ligaments that may not be visible on X-rays or CT scans. MRI can also identify muscle response to injury, such as scar formation and stiffness, and help direct optimal sites for muscle biopsy.
In the context of muscle weight, MRI can be used to quantify muscle mass and quality. It can provide imaging-based quantitative biomarkers of muscle conditions like sarcopenia, which is relevant in many chronic diseases. MRI is often used in body composition analysis, which involves assessing the different tissue compartments in the body, including muscles, adipose tissue, and bones.
There are different types of MRI machines, including closed bore and open machines. Closed bore machines provide the highest-quality images, while open machines offer more comfort due to the lack of an enclosed space, making them a better option for claustrophobic patients. MRI procedures may require sedation, especially for young children, to ensure they remain still during the exam.
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Frequently asked questions
You can use tools like smart scales or calipers to track your body fat and muscle mass at home. You can also calculate your body mass index (BMI) by taking your weight in pounds and dividing it by your height in inches squared. Then multiply the result by a conversion factor of 703. However, BMI does not differentiate between fat mass and muscle mass.
DEXA is the most accurate method to measure body composition. It involves a small amount of radiation but can measure the amount of fat in your abdominal cavity and the amount in your arms and legs. It can also measure bone density. Other accurate methods include MRI and CT scans, but these are costly and have limitations such as the maximum weight.
You will need to wait at least four weeks between measurements to see any quantifiable amount of change. It is also recommended to have the same person take the measurements at regular increments to monitor change.
Building muscle takes time, so measuring your progress is not only about how much muscle you have gained but also about your strength, endurance, energy, and physical ability improvements. Keeping a fitness journal can be a great way to measure progress.
