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Muscle displacement is a term used to describe the movement of muscles in the body. It can refer to the displacement of muscles in relation to other structures in the body, such as the superficial fascia, or it can refer to the displacement of muscle fibres within a muscle. Muscle displacement can be measured using various techniques such as tensiomyography, mechanomyography, and ultrasound imaging. These techniques are used to assess muscle contractile properties, muscle viscoelasticity, and muscle health. Muscle displacement is important in understanding muscle mechanics and can have applications in sports performance, rehabilitation, and medical diagnosis.
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What You'll Learn
Muscle atrophy
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy, also known as disuse atrophy, is caused by insufficient muscle use. This can be due to a sedentary lifestyle, malnutrition, old age, or certain health conditions that limit movement. Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that affect the nerves connecting to the muscles. When these nerves are damaged, they can't trigger the muscle contractions necessary for muscle activity. Pathologic atrophy is associated with aging, starvation, and diseases such as Cushing's disease, which can be caused by the overuse of corticosteroids.
The symptoms of muscle atrophy vary depending on its cause and severity. Common symptoms include a decrease in muscle mass, with one limb appearing smaller than the other, and weakness, numbness, or tingling in the limbs. More severe cases may lead to difficulty walking, balancing, swallowing, or speaking.
The treatment for muscle atrophy depends on the underlying cause and the degree of muscle loss. Exercise is widely recognised as the most effective therapy for skeletal muscle atrophy. Physiotherapy, ultrasound therapy, and in some cases, surgery, may also be recommended. Nutritional therapy can help reverse malnutrition-related atrophy, and certain medications and supplements are also being evaluated.
To diagnose muscle atrophy, a healthcare provider will conduct a physical examination and ask about the patient's symptoms and medical history. They may also order tests such as blood tests, muscle or nerve biopsies, and imaging scans to confirm the diagnosis and identify the underlying cause.
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Tensiomyography
TMG assesses muscle mechanical response based on radial muscle belly displacement induced by a single electrical stimulus. The method involves placing a special sensor on the muscle to be measured. This sensor contains a tip designed to register muscle contraction. Muscle contraction is then induced with a twitch-type (one millisecond) surface electrical stimulus, resulting in muscle belly displacement. The sensor is connected to a computer that records the displacement of the sensor tip and displays the results.
TMG output is a displacement-time signal evaluated with standard parameters: Delay time (Td), Contraction time (Tc), Sustain time (Ts), Relaxation time (Tr), and Maximal Displacement (Dm). Recent studies have also examined Contraction velocity (Vc) as a change in Dm over time. TMG provides valuable insights into muscle properties, including muscle stiffness, muscle mass, muscle architecture, and muscle contraction velocity.
TMG has been used to characterize athletes' muscle contractile properties and identify muscle dysfunctions to adjust training accordingly. It can help prevent the negative effects of muscle asymmetry and asynchrony on athletes' speed, explosiveness, endurance, and flexibility. TMG is also used in military and veterinary applications and in research areas such as acute muscle diagnostics, chronic muscle change diagnostics, and local muscle fatigue.
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Mechanomyography
MMG offers several advantages over electromyography (EMG), the standard technology for monitoring muscle activity in laboratories. Unlike EMG, which requires surface electrodes or fine wire electrodes inserted into the muscle, MMG does not require precise sensor placement. Additionally, MMG is a mechanical signal, so it is unaffected by changes in skin impedance due to sweating. MMG can also be used alongside EMG to examine neuromuscular function.
MMG has been extensively applied in clinical and experimental settings to study muscle characteristics, including muscle function, prosthesis and/or switch control, signal processing, physiological exercise, and medical rehabilitation. For example, MMG has been used to examine fatigue thresholds, comparing critical torque thresholds, electromyographic mean power frequency fatigue thresholds (sEMG MPFFT), and mechanomyographic mean power frequency fatigue thresholds (MMG MPFFT).
In one study, MMG and EMG amplitude and frequency were compared before, during, and after a squatting task. The results showed that MMG measures of muscle activity were similar to EMG in timing, duration, and magnitude during the fatigue task. This suggests that MMG can be a promising alternative to EMG, especially in pervasive applications where EMG is impractical due to cost, complexity, and invasiveness.
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Muscle displacement and superficial fascia
Muscle displacement refers to the movement of muscles in the body. This movement can be measured using tensiomyography, which is a non-invasive method that uses electrical stimuli to induce muscle contraction and subsequently measure the displacement of the muscle belly.
One specific type of muscle displacement that has been studied is semimembranosus muscle displacement. This type of displacement is associated with the movement of the superficial fascia, which is the outermost layer of fascia located directly under the skin. Fascia, in general, is a sheath of connective tissue that surrounds and supports various structures in the body, including muscles, tendons, ligaments, tissues, organs, nerves, joints, and bones. It provides structure, flexibility, and stability to these structures and allows for smooth movement without friction.
The superficial fascia specifically is a thin layer of collagenous tissue encapsulated in subcutaneous adipose tissue. It attaches superiorly to the skin and inferiorly to the deep fascia, which surrounds the musculoskeletal system. While the mechanical role of the superficial fascia has been considered relatively small, recent studies have suggested that there may be a direct mechanical relationship between the superficial fascia and skeletal muscle.
In an in vivo ultrasound investigation, researchers found that passive ankle dorsal extension induced a caudal displacement of the semimembranosus muscle, which was associated with soft tissue displacements in the dorsal thigh. This suggests that local muscle movement can lead to mutual interaction with the superficial fascia, and that these tissues are mechanically interdependent. Further research is needed to fully understand the role of the superficial fascia and its interaction with muscle displacement.
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Muscle viscoelasticity
Viscoelasticity, in the context of muscle tissue, refers to the muscle's ability to deform or lengthen over time when subjected to mechanical stress. This deformation is time-dependent, meaning that the rate of deformation varies with the duration of applied stress. For instance, rapid or high-intensity forces applied over a short period will not lead to significant deformation, whereas slow and steady pressure over a more extended period will result in more noticeable and lasting changes.
The viscoelastic nature of muscles has important implications for stretching and exercise routines. When muscles are stretched, the aponeurotic fascia, which is stiffer than the muscle, experiences most of the stress. This stress relaxation in the fascia contributes to determining the limits of stretching. Therefore, it is recommended to hold a stretched position for at least one minute to effectively relax the fascia and improve flexibility.
Additionally, muscle viscoelasticity is influenced by the rate and direction of compression or stretching. Studies have shown that the viscoelastic component plays a significant role in muscle mechanical properties, especially when the compression rate is above a certain threshold. The orientation of muscle fibres also matters, with a stiffening effect observed when compression is applied in directions closer to the muscle fibres.
Understanding muscle viscoelasticity is crucial for injury prevention and rehabilitation. The risk of injury during stretching may be related to the stretch rate rather than the technique used. By comprehending the viscoelastic characteristics of muscles and tendons, clinicians can develop effective stretching regimens to improve flexibility and reduce the chances of injury. Furthermore, the viscoelastic behaviour of muscles can be utilized to assess the presence and severity of certain diseases, such as liver fibrosis, through medical imaging techniques like elastography.
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Frequently asked questions
Muscle displacement refers to the movement of muscles in relation to other structures in the body, such as the superficial fascia. This movement can be measured and analysed to understand muscle mechanics and various conditions affecting the muscles.
Tensiomyography (TMG) is a widely used method for measuring muscle displacement. It involves applying an electrical stimulus to evoke a muscle contraction and then using a sensor to measure the resulting displacement. This non-invasive technique provides valuable data for sports performance, rehabilitation, and research.
Muscle displacement measurements have applications in sports medicine, sports training, and rehabilitation. By analysing muscle displacement, professionals can evaluate muscle contractile properties, diagnose muscular conditions, and optimise rehabilitation processes. Additionally, muscle displacement studies contribute to our understanding of muscle mechanics and the interplay between different structures in the body.
