Alec Titan
The thoracic spine, which starts at the base of the neck and ends at the bottom of the ribs, is surrounded by muscles, nerves, tendons, and ligaments that enable movement and flexibility. The T2 distribution in forearm muscles has been a subject of interest for researchers, who have used the T2 method to detect activated muscles. T2 values are characteristic of tissue composition and metabolic properties, and can be used to detect exercised muscles. The T2 distribution in muscles was found to be Gaussian, suggesting that a one-sample t-test can be applied, and that ZT = 2.56 could cover low-intensity exercise with high specificity and a low false-positive rate.
| Characteristics | Values |
|---|---|
| Definition | T2 is a measure of transverse relaxation time of muscles. |
| Detection | T2 is used to detect exercised muscles. |
| T2 Distribution | T2 distribution in muscles was found to be Gaussian. |
| T2 Threshold | ZT = 2.56 could cover low-intensity exercise with high specificity and a low false-positive rate. |
| T2 Values | T2 values for 10 forearm muscles were obtained in the resting state and after isometric wrist flexion exercise with 5%, 15%, and 25% of the maximum voluntary contraction (MVC). |
| T2 and MRI | MRI provides a non-invasive diagnostic platform to quantify the physical and physiological attributes of skeletal muscle at rest and in response to exercise. |
| T2 and Disease | Quantitative T2 may provide rapid non-invasive measures of pathophysiology and functional impairment in characterizing disease severity. |
| T2 and Nerves | T1 and T2 (top two thoracic nerves) feed into nerves that go into the top of the chest as well as into the arm and hand. |
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What You'll Learn
T2 distribution in forearm muscles
The T2 distribution in muscles was found to be Gaussian, suggesting that a one-sample t-test can be applied. A normal distribution of T2 was detected in resting muscles at 34 ± 3 ms (mean ± standard deviation [SD]) in 26 subjects using the Kolmogorov-Smirnov test, the Shapiro-Wilk test, and the Jarque-Bera test (P > 0.05).
In the experiment, a small region of interest (ROI) of 16 pixels (9.8 mm2) was used instead of an ROI that covered the whole muscle. This was done for three reasons: firstly, it is easier to select an ROI that excludes non-muscle tissues; secondly, the same ROI size can be applied to 10 muscles in the forearm; and thirdly, the sample size of 16 is enough to discriminate a 1.0 SD difference in the T2 values with a one-sided α error of 0.05 and a β error of 0.2.
The T2 distribution in resting muscle was not symmetrical but skewed towards higher T2 values. A high T2 component (> 35 ms) in resting muscle indicated non-muscle tissue, such as fat. T2 values for 10 forearm muscles were obtained in the resting state and after isometric wrist flexion exercises with varying percentages of maximum voluntary contraction (MVC). The average force of three measurements was used for the MVC. Three levels of exercises (5%, 15%, or 25% of MVC) were applied in random order at intervals longer than one week.
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T2 threshold for defining activated muscles
T2-weighted imaging is a type of magnetic resonance imaging (MRI) that uses a strong magnetic field and radio waves to create detailed images of the body's internal structures. It is often used to examine muscles and detect muscle activation or exercise.
The T2 threshold for defining activated muscles refers to the use of T2 distribution and reference values to distinguish between resting and exercised muscles. T2 values represent the transverse relaxation time of muscles, which increases when muscles are exercised or activated. By comparing T2 values in the resting state to those after muscle contraction, researchers can identify and quantify muscle activation.
Several studies have utilised the T2 method for detecting activated muscles. One study by Takamori et al. investigated muscle activity during forearm pronation exercises using T2-map MRI. They obtained T2 values for forearm muscles at rest and after different levels of maximum voluntary contraction (MVC). Three thresholds, ZT = 1.00, 2.56, and 3.07, were applied to distinguish between agonist and antagonist muscles. The ZT = 1.00 threshold offered the highest sensitivity, while ZT = 3.07 demonstrated the highest specificity.
Another study by Prior et al. examined changes in T2 distribution in exercised muscle, assuming a Gaussian distribution of T2 values at rest. They found that the T2 distribution in muscles followed a normal Gaussian distribution, suggesting that a one-sample t-test could be applied. Additionally, they determined that ZT = 2.56 could effectively cover low-intensity exercise with high specificity and a low false-positive rate.
In summary, the T2 threshold for defining activated muscles involves analysing T2 distribution and applying specific thresholds to differentiate between resting and exercised muscles. This method has been validated through various studies and is useful for detecting muscle activation, particularly during low-intensity exercise, with high accuracy.
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T2's role in detecting exercised muscles
T2 is a useful tool for detecting exercised muscles. It is a non-invasive diagnostic method that uses MRI to quantify the physical and physiological attributes of skeletal muscle at rest and in response to exercise. T2 values increase in exercised muscles, and a threshold with a mean + 1.0 standard deviation (SD) in the T2 of resting muscle has been used for the detection of contracted muscles. This is based on the assumption of a normal (Gaussian) distribution of T2 values in resting muscles.
Several studies have been conducted to investigate the T2 distribution in exercised muscles. One study used a small region of interest (ROI) that did not cover the entire muscle, while others examined the T2 distribution in the whole muscle. The T2 distribution in resting muscle was found to be skewed towards higher T2 values, indicating the presence of non-muscle tissue such as fat. However, the T2 distribution in exercised muscle becomes more symmetrical, and the SD of T2 values tends to increase.
To detect exercised muscles, researchers define a Gaussian T2 distribution and reference values (T2r and SDr) in the resting state, and then apply a threshold for detecting exercised muscles. Multiple-spin-echo (MSE) MR images are obtained with different TE values, and T2 values are measured in the resting state and after different levels of muscle contraction. Z values are then calculated using the formula (T2e − T2r)/SDr, where T2e is the T2 value after exercise. Different thresholds (ZT) are applied to agonist and antagonist muscles to determine if there is a significant increase in T2 values post-exercise.
T2 has been used to detect exercised muscles in various parts of the body, including the forearm, lower extremity, and quadriceps femoris muscle. It has been found to be effective in detecting muscle activity during forearm pronation and rotation exercises, as well as in evaluating the rest/recovery kinetics of skeletal muscle in response to treadmill exercise. T2 can provide valuable insights into exercise physiology, the pathophysiology of diseases affecting skeletal muscle, and the effects of rehabilitation activities aimed at improving functional capacity.
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T2's relation to spinal nerves
The thoracic spine is the middle section of the spine, starting at the base of the neck and ending at the bottom of the ribs. It consists of 12 vertebrae, numbered T1 to T12. Each vertebra in the spine is associated with the nerves in that section of the spinal cord. The T1 and T2 nerves are the top two thoracic nerves, and they feed into nerves that go into the top of the chest, as well as into the arm and hand.
The T1 nerve is also part of the brachial plexus, a network of nerves in the shoulders that carry movement and sensory signals from the spinal cord to the arms and hands. These nerves branch off the spinal cord and supply sensation and movement to certain areas of the body. The T1 nerve root runs between the T1 vertebra and T2 vertebra.
The T2 nerve is also involved in supplying sensation and movement to the upper chest, arms, and hands. It is located just below the T1 nerve, running between the T2 vertebra and T3 vertebra. The T2 nerve is also involved in the brachial plexus, along with the T1 nerve.
Injuries to the thoracic spine can result in spinal cord damage, which can lead to permanent dysfunction in the lower body. Spinal cord injuries are classified based on the spinal nerve root level where function is impaired or lost. For example, a T6 spinal cord injury would result in a loss of function at the T6 nerve root level and below. This could cause weakness, numbness, and other issues in the abdominal area and lower body, such as paralysis of the legs and bowel/bladder dysfunction.
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T2's relation to spinal injuries
The T2 nerve is one of the 12 pairs of spinal nerves that originate from the thoracic segments of the spinal cord. The T2 nerve root affects sensation around the armpits, upper chest, and upper chest muscles. It also goes into the top of the chest and into the arms and hands.
Spinal cord injuries at or above T1 result in the loss of movement and sensation in all four limbs, a prognosis often called quadriplegia or tetraplegia. Spinal cord injuries that damage the thoracic vertebrae (T2 through T12) mainly damage the connection between the brain and the legs. This type of injury typically results in paraplegia, or the loss of sensation and movement in the legs and lower body.
Thoracic spinal cord injuries directly affect movement and sensation in the inner arms, trunk, and abdomen. They also affect lower limb functions because messages from the brain cannot always travel past the injury site. Individuals with thoracic spinal cord injuries may develop weakness or paralysis in the legs, as well as loss of bowel and bladder control. Depending on the level and severity of the spinal cord injury, the extent to which motor control and sensation are affected may vary. Some individuals may only experience weakness and difficulty with coordinating their leg movements, while others may be paralysed and lose sensation from the trunk down.
Vertebral compression fractures (VCFs) are the most common injury to the thoracic spine. They occur when a vertebra in the spine collapses, which can lead to severe pain, deformity, and loss of height. A severe strain of a muscle between the ribs (intercostal muscle) or a slipping rib can cause an intercostal nerve to become inflamed, painful, and possibly make breathing more difficult and certain movements painful.
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Frequently asked questions
T2 is a measure of the transverse relaxation time of muscles, which is used to detect exercised muscle.
The T1, T2 and T2* measures are used to characterise the kinetics of relaxation parameters in the leg muscle groups, which are influenced by age and gender.
The thoracic spine is surrounded by muscles, nerves, tendons and ligaments that help with movement and flexibility. The latissimus dorsi, trapezius, levator scapulae and rhomboids are all superficial back muscles found just under the skin. The serratus posterior superior and serratus posterior inferior are intermediate back muscles. The Erector Spinae and Transversospinalis Group are intrinsic back muscles.
The thoracic spine supports the chest and abdomen. It helps stabilise the rib cage, which in turn stabilises the spine.
