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Muscle loss, also known as muscle atrophy or sarcopenia, can be caused by several factors, including ageing, disuse of muscles, nerve damage, or underlying diseases. Measuring muscle loss is important for monitoring health and performance, especially in individuals with certain medical conditions. There are various methods to assess muscle loss, including body composition scans, anthropometric measurements, and functional assessments. This introduction will discuss the reasons for measuring muscle loss and provide an overview of the different techniques used to quantify it.
| Characteristics | Values |
|---|---|
| Muscle loss diagnosis | Sarcopenia is diagnosed using the appendicular lean mass calculation derived from the dual-energy X-ray absorptiometry (DXA) estimate. |
| Muscle loss diagnosis limitations | The DXA estimate of lean mass only gives a regional estimate of body composition and cannot differentiate between different muscle groups. |
| Muscle loss diagnosis alternative | Diagnostic B-mode ultrasound can provide reliable estimates of individual muscle groups and may provide a method for earlier detection of sarcopenia. |
| Muscle loss prevention | Preserve as much muscle mass as possible by eating a higher amount of protein every day. |
| Muscle loss measurement | Monitor body fat percentage as often as possible to make sure you're not losing too much lean mass. |
| Muscle loss measurement tools | Body fat calipers, body fat scales, DEXA scans, MRI, CT scans, anthropometric formulae, circumference measurements, and flexible tape measures. |
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What You'll Learn
Monitoring body fat percentage
Monitoring your body fat percentage is an important way to gauge how much fat you're losing versus muscle mass. There are several methods to measure your body fat percentage, each with its own advantages and disadvantages.
DEXA Scans
DEXA scans, or dual-energy X-ray absorptiometry, are considered the most accurate way to measure body fat and muscle mass. The scan provides detailed information, including a breakdown of different body regions and bone density readings. However, they are often unavailable to the general public, expensive, and deliver a small amount of radiation.
Underwater Weighing
Also known as hydrostatic weighing or hydrodensitometry, this method measures your body density, which is then used to estimate body fat percentage. Fat is less dense than bone and muscle, so someone with a higher percentage of fat will weigh less underwater. While it offers highly accurate results, it can be difficult or impossible for some individuals to be fully submerged underwater. It is also hard to access and can be costly.
Skinfold Calipers
Skinfold calipers, or body fat calipers, are small pincers that measure the thickness of subcutaneous fat (the fat underneath the skin) at certain body locations. This method is affordable and relatively simple, but its accuracy depends on the skill of the person performing the assessment.
Body Circumference Equations
This method uses an individual's age, height, and circumference measurements of certain body parts to estimate body fat percentage. It is easy, affordable, and can be done at home. However, it may not be accurate for all people due to differences in body shape and fat distribution.
Smart Scales
Smart scales can provide an instant estimate of your body fat percentage. They are available at a range of price points, but may not be suitable for individuals with pacemakers.
It is important to note that while weight loss is an accomplishment, it is natural to lose both fat and muscle when slimming down. To stay healthy, it is recommended to preserve as much muscle mass as possible while dieting, such as by increasing your protein intake.
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DEXA scans
DXA (Dual-Energy X-ray Absorptiometry) scans are a precise method for measuring muscle loss. They are a type of imaging test that uses two low-dose x-ray beams to measure the strength and mineral content of your bones and provide a detailed breakdown of your body composition, including muscle mass, fat tissue, and bone mass.
DXA scans are widely regarded as one of the most accurate methods for measuring body composition, offering far more precise data than other techniques such as skinfold calipers, bioelectrical impedance, BMI, InBody, BodPod, and hydrostatic weighing. The scans can differentiate between fat loss and muscle loss, making them a valuable tool for individuals focused on strength training and muscle building.
The process of undergoing a DXA scan is straightforward and non-invasive. Prior to the scan, it is recommended to be well-hydrated and refrain from eating for at least three hours. During the scan, you simply lie comfortably on a scanning bed for approximately 3 to 12 minutes, depending on the machine and body size. It is important to minimize metal objects such as watches, zippers, and jewellery, as they can interfere with the scan.
Following the scan, you will receive a comprehensive report detailing your body composition results. This includes measurements of bone mass, fat tissue, and muscle mass in different regions of the body. The report provides valuable insights for individuals interested in tracking their health, optimizing their fitness, or achieving specific body composition goals. Additionally, a consultation with an exercise specialist can help interpret the data, identify potential health risks, and create a personalized plan to meet your goals.
Overall, DXA scans offer a precise and non-invasive method for measuring muscle loss and body composition. They provide valuable insights that can help individuals make informed decisions to enhance their health, fitness, and overall well-being.
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B-mode ultrasound
Recent studies have also utilised B-mode ultrasound images in combination with neural networks to detect muscle fascicles and aponeuroses. This automated analysis approach has yielded results similar to those obtained through manual analysis, demonstrating the potential for efficient and accurate muscle architecture analysis using B-mode ultrasound.
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Measuring limb circumference
When measuring the arms, the biceps, forearms, and elbows are assessed. The arms should be measured at the same distance above or below the elbow. The leg measurements should be taken at the thigh and calf, at equal distances from above the joint line or another palpable anatomical structure. The thigh, for example, is measured 10 cm above the patella with the knee fully extended and the muscles relaxed.
It is important to note that the measurements should be taken at consistent distances from the joint or another anatomical structure to ensure accuracy and consistency in tracking muscle atrophy over time.
Additionally, it is worth mentioning that while these circumference measurements can provide insights into muscle atrophy, they may not fully capture the underlying levels of muscle synthesis or degradation that regulate muscle volume. For a more comprehensive understanding of muscle wasting, sequential scans and muscle biopsies may be necessary.
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Calculating body fat using electrical current
BIA devices work by sending small electrical currents through the body to observe how easily they travel through body tissues. Different tissues in the body allow the electrical current to travel at different speeds. Fat is more resistant than muscle or water, so the higher the resistance, the higher the body fat percentage. The current encounters higher resistance in fat tissues than in fat-free tissues due to differences in water content. Most body water is stored in muscles, so a person with more muscular body composition will likely have more body water, leading to lower impedance.
BIA devices are commonly found in fitness centres and can also be used at home with specialised scales. They are popular as they are quick, non-invasive, and relatively affordable compared to other body composition measurement techniques. However, it is important to note that BIA results can be influenced by factors such as hydration levels, recent exercise, and food intake. Therefore, it is recommended to use this method under controlled conditions, maintaining similar circumstances each time a test is taken.
While BIA can provide valuable insights into body composition, it may not tell the complete story about an individual's health. Other factors, such as gender, body type, and age, also play a role in overall health and should be considered alongside body fat measurements. Additionally, BIA should not be used by individuals with electronic medical implants, such as pacemakers, or by pregnant people, as advised by most device manufacturers.
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Frequently asked questions
Monitoring your body fat percentage is a good way to gauge how much fat you're losing versus muscle mass. DEXA scans are the most accurate way to measure your body fat and muscle mass.
Muscle loss can be caused by disuse of muscles, injury to the central or peripheral nervous system, or a primary disease of the muscle itself. Loss of muscle mass is also a common cause of morbidity and mortality in patients with cancer.
Muscle loss is often measured in centimeters with a flexible tape measure. There are also body fat scales that calculate the amount of fat by sending an electrical current through the body.
