Muscle Mass Assessment
Muscle Mass Assessment - Related Videos
14:02
Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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Cited by 53 •
2012
We describe a method to directly measure muscle force, muscle power, contractile kinetics and fatigability of isolated skeletal muscles in an in vitro system using field stimulation. Valuable information on Ca2+ handling properties and contractile machinery of the muscle can be obtained using different stimulating protocols.
15:18
Near Infrared Optical Projection Tomography for Assessments of β-cell Mass Distribution in Diabetes Research
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Cited by 44 •
2013
We describe the adaptation of optical projection tomography (OPT)1 to imaging in the near infrared spectrum, and the implementation of a number of computational tools. These protocols enable assessments of pancreatic β-cell mass (BCM) in larger specimens, increase the multichannel capacity of the technique and increase the quality of OPT data.
02:08
Assessing Muscle Contraction with Neuromuscular Blocker Treatment
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2025
This video demonstrates assessing the muscle using cultured motor neurons, Schwann cells, and myotubes, followed by treatment with a neuromuscular blocker to inhibit contraction. Color-coded time-motion graphics show a color-coded time-motion graphic. Red indicates the fastest movement, and blue indicates the slowest.
06:46
In Vivo Functional Assessment of Rat Masseter Muscle Following Surgical Creation of a Volumetric Muscle Loss (VML) Injury
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Cited by 1 •
2024
Volumetric muscle loss (VML) injuries exceed endogenous regenerative ability, resulting in permanent functional deficits. Current VML research primarily focuses on limb and trunk muscles. To extend mechanistic studies of VML to craniofacial muscles, this article describes an in vivo method for longitudinal assessment of masseter muscle function pre- and post-VML injury.
11:22
Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers
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Cited by 15 •
2014
Described here is a method to directly measure calcium sparks, the elementary units of Ca2+ release from sarcoplasmic reticulum in intact skeletal muscle fibers. This method utilizes osmotic-stress-mediated triggering of Ca2+ release from ryanodine receptor in isolated muscle fibers. The dynamics and homeostatic capacity of intracellular Ca2+ signaling can be employed to assess muscle function in health and disease.
FAQs
Muscle mass assessment becomes more clinically informative when paired with strength and functional testing because muscle quantity alone does not fully represent how a patient performs physically. This combined approach improves overall patient assessment and risk prediction, while connecting measurement findings with rehabilitation or nutrition planning. It is especially useful when clinical decisions depend on function, not size alone.
Bioelectrical impedance analysis estimates lean tissue indirectly from the way a low electrical current moves through body fluids and tissues. CT and MRI, in contrast, measure muscle size directly through imaging. This difference matters during interpretation: bioelectrical impedance provides an estimate based on tissue conductivity, whereas imaging supplies a direct size-based measurement. The methods therefore answer related but not identical clinical questions.
Considering where muscle is distributed, rather than only its total quantity, adds context to physical function and disease-related change. In clinical assessment, distribution can be considered alongside nutritional status and functional findings to produce a more complete picture of the patient. This broader view supports interpretation of whether observed changes may have significance for rehabilitation, nutrition planning, or risk assessment.
Available approaches include anthropometry, bioelectrical impedance analysis, dual-energy X-ray absorptiometry, ultrasound, and CT or MRI. These methods do not provide information in exactly the same way: bioelectrical impedance estimates lean tissue, whereas CT and MRI can measure muscle size directly. Clinicians should therefore interpret findings in relation to the method used and the patient's broader clinical assessment.
Repeated measurements allow clinicians to track whether muscle-related findings change during treatment rather than relying on a single result. This longitudinal use can help monitor responses to rehabilitation or nutrition plans and show whether the patient's status is moving in the intended direction. Interpreting trends alongside strength and functional tests gives treatment monitoring greater clinical context.
In chronic illness, these measurements can help characterize muscle wasting and support evaluation of sarcopenia or malnutrition. Their clinical value extends beyond identifying a condition: results can inform rehabilitation and nutrition planning, while follow-up measurements can show responses to treatment. Combining these findings with physical function and strength measures strengthens patient assessment and may improve risk prediction.