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Muscle attenuation is a measure of muscle density, which is determined by computed tomography (CT) or magnetic resonance imaging (MRI). CT differentiates tissues based on their attenuation characteristics, which are primarily a function of tissue density. The skeletal muscle attenuation coefficient is a non-invasive measure of muscle density, and lower values reflect increased muscle lipid content. Muscle attenuation is associated with muscle strength, metabolic syndrome, and gastroesophageal reflux disease (GERD).
| Characteristics | Values |
|---|---|
| Definition | Muscle attenuation is a measure of muscle density. |
| Calculation | Muscle attenuation is calculated by multiplying the area of a given pixel extracted from the image header. |
| Measurement | Computed tomography (CT) is used to determine muscle attenuation. |
| Muscle Composition | Skeletal muscle contains intra-myocellular lipid droplets within the cytoplasm of myocytes as well as inter-muscular adipocytes. |
| Muscle Density | Lower muscle attenuation values reflect increased muscle lipid content. |
| Muscle Strength | Lower muscle attenuation values are associated with lower muscle strength. |
| Age | Midthigh muscle attenuation values are lowest in elderly men and women. |
| Sex | Men have greater muscle attenuation values than women. |
| Health | Sarcopenia, the progressive loss of muscle mass, is associated with muscle attenuation and can lead to physical disability and low quality of life. |
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What You'll Learn
Muscle attenuation and muscle strength
Muscle attenuation refers to the process of measuring skeletal muscle radiation attenuation and the basis of its biological variation. It is a non-invasive method of measuring muscle density and composition, particularly the amount of muscle lipid content. This is done through computed tomography (CT) or magnetic resonance imaging (MRI) to characterise the composition of the muscle itself. The skeletal muscle attenuation coefficient is determined by CT and is a measure of muscle density, with lower values reflecting increased muscle lipid content.
Muscle attenuation is associated with muscle strength. Lower muscle attenuation values are associated with lower muscle strength. This relationship was examined in the Health ABC Study, which found that lower values for muscle attenuation were associated with lower voluntary isokinetic knee extensor strength in 2,627 men and women aged 70-79. The study also found that strength was higher in men than in women, and men had greater muscle attenuation values and muscle cross-sectional area (CSA) at the midthigh than women.
The attenuation coefficient of muscle was independently associated with muscle strength after adjustment for muscle CSA and midthigh adipose tissue in men and women. This means that the attenuation values of muscle on CT in older persons can account for differences in muscle strength not attributed to muscle quantity. In other words, muscle strength is not solely dependent on muscle mass but also on muscle composition, as revealed by muscle attenuation values.
Sarcopenia, the progressive loss of muscle mass and function that occurs with ageing, is associated with muscle attenuation. It is considered a major health concern as it is linked to physical disability, low quality of life, and mortality. Sarcopenia is also associated with metabolic syndrome, which includes obesity, and is a known predictive factor for gastroesophageal reflux disease (GERD). The association between sarcopenia and GERD may be due to the development of insulin intolerance caused by muscle mass attenuation leading to metabolic syndrome.
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Muscle radiation attenuation
Skeletal muscle radiation attenuation is a radiological characteristic that is inversely related to muscle fat content. It is a non-invasive measure of muscle density, with lower values reflecting increased muscle lipid content. This can be determined through computed tomography (CT), which differentiates tissues based on their attenuation characteristics, primarily a function of tissue density. CT uses computer-processed X-rays and has become a valuable tool in muscle physiology research, providing direct measures of tissue cross-sectional area and volume.
CT images can be used to calculate skeletal muscle and adipose tissue areas of the thigh, for instance, by multiplying the area of a given pixel extracted from the image header. The mean attenuation coefficient values of muscle within the regions outlined on the images are determined by averaging the CT number (pixel intensity) in Hounsfield units. The skeletal muscle attenuation coefficient is a measure of muscle density, with lower values reflecting increased muscle lipid content. This coefficient has been examined in relation to muscle strength, with studies finding that lower muscle attenuation values are associated with lower voluntary isokinetic knee extensor strength in elderly men and women.
In addition to its application in understanding muscle strength, skeletal muscle radiation attenuation has been studied in the context of various health conditions. For example, low skeletal muscle radiation attenuation has been linked to overall survival and surgical site infections in patients with pancreatic cancer. It is also indicative of myosteatosis, which is associated with diabetes, obesity, reduced muscle activity, myositis, and cancer. Furthermore, low thoracic muscle radiation attenuation has been associated with postoperative pneumonia following partial hepatectomy for colorectal metastasis.
The measurement of skeletal muscle radiation attenuation and its biological variation is an area of active research. Available evidence suggests that muscle attenuation is subject to physiological variation induced by ageing and aerobic training, which may be related to the accumulation of lipids. However, inconsistent criteria for upper and lower Hounsfield unit (HU) cut-offs used to characterise muscle attenuation limit comparisons between investigations. Standardised criteria for reporting muscle attenuation would benefit this field of research.
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Skeletal muscle attenuation coefficient
Skeletal muscle attenuation is a non-invasive measure of muscle density that can be determined using computed tomography (CT). It is a parameter that is inversely related to muscle fat content. In other words, lower values reflect an increased muscle lipid content.
The skeletal muscle attenuation coefficient is calculated by multiplying the area of a given pixel extracted from the image header. The mean attenuation coefficient values of muscle are determined by averaging the CT number (pixel intensity) in Hounsfield units. The Hounsfield unit is a measure of radiodensity, which is the relative ability of a material to block the passage of X-rays. The skeletal muscle attenuation coefficient can be used to predict hip fracture in elderly patients, as computed tomographic measurements of thigh muscle cross-sectional area and attenuation coefficient are indicators of bone health.
The skeletal muscle attenuation coefficient has been studied in the context of aging muscle and its effect on strength. The Health ABC Study examined the hypothesis that lower values for muscle attenuation are associated with lower voluntary isokinetic knee extensor strength in elderly men and women. The results showed that strength was higher in men than in women, and men also had greater muscle attenuation values and muscle cross-sectional area at the midthigh than women.
Additionally, the skeletal muscle attenuation coefficient has been investigated in obese individuals, where altered skeletal muscle composition is manifested by a reduced attenuation coefficient on CT, suggesting increased fat infiltration within the muscle. This has been associated with reduced oxidative enzyme capacity and insulin resistance in muscle. Furthermore, muscle wasting diseases such as Duchenne muscular dystrophy are also characterised by reductions in muscle mass and attenuation of muscle on CT, coinciding with impaired muscle function.
In summary, the skeletal muscle attenuation coefficient is a valuable tool for assessing muscle density and composition, particularly in the context of aging and obesity. It provides insights into muscle strength, function, and overall health.
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Skeletal muscle lipid content
Muscle attenuation refers to the non-invasive measurement of skeletal muscle density using computed tomography (CT). Lower muscle attenuation values reflect increased muscle lipid content.
The amount of IMCLs in skeletal muscle can vary depending on several factors, including age, diet, and metabolic conditions such as obesity and type 2 diabetes. For example, aging is associated with a reduction in skeletal muscle mass and strength, known as sarcopenia, which is partly due to the accumulation of intramyocellular lipid droplets. Additionally, a high-fat diet can lead to increased IMCL content, as the surplus of fat is stored not only in adipose tissue but also in non-adipose tissues like skeletal muscle.
Obese and type 2 diabetic individuals have been found to exhibit increased skeletal muscle lipid content, which is associated with disturbances in oxidative enzyme activity and insulin resistance. This increased lipid content may be due to the overconsumption of fatty foods and a lack of physical activity, leading to a continuous supply of fat to the muscle without sufficient oxidation.
In summary, skeletal muscle lipid content refers to the amount of IMCLs stored within skeletal muscle tissue, which can be influenced by various factors such as age, diet, and metabolic conditions. Understanding skeletal muscle lipid content is important as it may have implications for muscle function and overall health.
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Muscle quality in aging
Muscle attenuation refers to the measurement of skeletal muscle radiation attenuation, or muscle density, which is determined by computed tomography (CT). CT differentiates tissues based on their attenuation characteristics, which are primarily a function of tissue density. The skeletal muscle attenuation coefficient is a noninvasive measure of muscle density, and lower values reflect increased muscle lipid content.
The age-related loss of muscle function is known as sarcopenia, derived from the Greek words for flesh (sarcos) and loss (penia). Sarcopenia is a type of muscle atrophy primarily caused by the natural aging process. It is characterised by a decrease in both the number and size of muscle fibres, causing muscles to thin. Sarcopenia commonly affects the elderly population and can greatly impact one's quality of life by reducing the ability to perform daily tasks. Rates of the condition range from 5% to 13% in people aged 60 and older, increasing to 11% to 50% in people aged 80 and older.
The onset of sarcopenia usually begins in one's 30s or 40s, with a more rapid progression between the ages of 65 and 80. While the exact mechanism is not fully understood, it is believed that changes in hormone levels, such as testosterone and insulin-like growth factor (IGF-1), play a significant role in the development of sarcopenia. Additionally, physical inactivity, an unhealthy diet, and certain chronic diseases are considered contributing factors.
The effects of sarcopenia include a loss of muscle strength and power, as well as reduced function and mobility. This can lead to an increased risk of falls and related fractures. However, it is important to note that sarcopenia is not an inevitable consequence of aging, and there are strategies to slow down or even reverse its effects. Progressive resistance training (PRT) and a higher-protein diet have been shown to help rebuild and maintain muscle mass. Additionally, research is exploring the potential use of hormone supplements to increase muscle mass.
While muscle attenuation provides valuable information about skeletal muscle composition and function, further research is needed to fully understand the complex relationship between muscle quality, aging, and the various factors that influence muscle health.
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Frequently asked questions
Muscle attenuation is the reduction in muscle mass and strength that occurs with aging.
Muscle attenuation is measured using computed tomography (CT) or magnetic resonance imaging (MRI) to determine the skeletal muscle attenuation coefficient, a non-invasive measure of muscle density.
Factors such as obesity, diabetes, inactivity, and degenerative conditions can lead to reduced muscle attenuation.
Muscle attenuation, also known as sarcopenia, is associated with physical disability, low quality of life, and increased mortality risk. It is linked to metabolic syndrome, including obesity, and gastroesophageal reflux disease (GERD).
While aging is a primary cause of muscle attenuation, maintaining physical activity and managing obesity and diabetes can help mitigate its effects. Resistance training and nutritional interventions can also improve muscle power and strength.
