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Muscle creep, or spinal tissue creep, is a phenomenon that occurs when the viscoelastic tissues in the lumbar spine are subjected to sustained or repeated static or cyclic loading, leading to deformation and potential micro-damage in the collagen structure. This deformation can result in muscle imbalances and decreased stability in the spine, making it more susceptible to injury. The effects of muscle creep can include tightness, muscle tension, spasms, and low back pain. Prolonged periods of sitting or remaining in a static position can contribute to muscle creep, and it has been suggested that taking breaks to move and stretch can help prevent it. Understanding and managing muscle creep is crucial for maintaining spinal health and preventing long-term injuries.
| Characteristics | Values |
|---|---|
| Definition | "Creep is a deformation mechanism that may or may not constitute a failure mode." |
| Deformation | Creep is defined by an initially rapid increase in deformation, followed by a slower increase in deformation at a constant stress (load) over time. |
| Deformation mechanism | Creep deformation does not occur suddenly upon the application of stress. Instead, strain accumulates as a result of long-term stress. |
| Time-dependence | Creep is a "time-dependent" deformation. |
| Reversibility | Creep is a reversible phenomenon. Once the load is removed, the original shape (or length) is recovered. |
| Temperature dependence | Creep deformation generally occurs when a material is stressed at a temperature near its melting point. |
| Stages | Creep behaviour can be split into three main stages: primary or transient creep, secondary or steady-state creep, and tertiary creep. |
| Health risks | Creep of spinal tissues affects reflex activation of the back muscles, leading to muscle tension, tightness, and spasms. |
| Prevention | To prevent creep, it is recommended to get up and move every 20 minutes, stretch, or do light exercises like downward dog or tai chi. |
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What You'll Learn
Muscle creep is a form of muscular dysfunction
In the context of muscular dysfunction, creep specifically refers to the deformation of spinal tissues and the resulting impact on muscle activity. This can occur due to repetitive exposure to prolonged deep trunk flexion, which is associated with the development of low back pain (LBP) and disorders. The combination of gradually increasing creep in the viscoelastic tissues of the spine and the decrease in reflexive muscular activation leaves the spine more vulnerable to instability and injury.
For example, in a study on the creep of lumbar viscoelastic tissue, sustained static or cyclic loading of these tissues was found to potentially cause micro-damage in the collagen structure. This micro-damage can lead to inflammation and the reflexive elicitation of spasms in the multifidus muscles, resulting in muscular dysfunction. The spasms and increased muscular forces are the body's attempt to limit the range of motion and unload the viscoelastic tissues to prevent further damage and promote healing.
Additionally, creep can affect the neuromuscular control of the spine, leading to delayed or over-responsive muscle activation, further increasing the risk of injury. This is particularly relevant when considering the impact of creep on spinal ligaments, as once creep occurs, the muscle system struggles to protect these ligaments from strain and potential damage. Therefore, it is important to manage creep through appropriate movement and exercise and the use of supportive mattresses while sleeping to maintain spinal health and prevent injuries.
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It is caused by sustained static or cyclic loading
Muscle creep is a phenomenon that occurs when human tissues are subjected to sustained static or cyclic loading. It is characterised by an initial rapid increase in deformation, followed by a slower and constant increase over time. In simpler terms, it is the tendency of tissues to continue elongating under constant tension, even if the force of the stretch is not increased. This can be observed in our day-to-day lives when we sit for prolonged periods. Our spines, hips, and lower extremities are prone to this tissue change, and the risk of injury increases.
The concept of muscle creep is not limited to human tissues; it is also observed in materials science. Creep, also known as "cold flow," refers to the deformation that occurs in solid materials under sustained mechanical stress. This deformation can be influenced by factors such as the material's properties, exposure time, temperature, and the applied structural load. For example, a turbine blade may fail due to creep deformation, causing it to contact its casing.
The human body, particularly the lumbar spine and its surrounding tissues, is susceptible to creep. Sustained static or cyclic loading of the lumbar region can result in micro-damage to the collagen structure, leading to spasms and hyperexcitability during the recovery phase. This micro-damage also triggers an inflammatory response, which contributes to the development of common low back disorders.
Furthermore, creep in the spine ligaments and viscoelastic tissues can impair spinal stability and increase the risk of low back pain and disorders. The combination of creep deformation and muscle fatigue can alter muscle activity amplitude, frequency domain, and distribution, impacting the spine's overall stability.
To mitigate the effects of muscle creep, it is essential to maintain proper posture, get regular exercise, and avoid prolonged periods of remaining in the same position. Additionally, seeking professional advice from doctors of physical therapy can help address specific concerns and develop strategies to prevent and manage muscle creep.
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It can lead to spasms and hyperexcitability in the multifidus
Creep is a phenomenon in materials science wherein solid materials undergo slow deformation when subjected to persistent mechanical stresses. This is also referred to as "cold flow". In the context of human health, creep can occur in muscles and tissues when they are exposed to sustained or repeated movements or loads.
When it comes to the multifidus muscle, creep can lead to spasms and hyperexcitability. The multifidus is a deep spinal muscle that plays a crucial role in maintaining spine stability. During static or cyclic flexion of the lumbar spine, the viscoelastic tissues in this region can undergo creep deformation. This deformation can result in spasms and hyperexcitability in the multifidus muscle as it attempts to limit the range of motion and unload the stressed viscoelastic tissues to prevent further damage and promote healing.
In a study on feline models, static flexion of the lumbar spine with a constant load applied to the viscoelastic structures for 20 minutes resulted in the development of spasms and inhibition in the multifidus muscles. This inhibition was observed as a decrease in the magnitude of reflexive EMG from the multifidus upon flexion. The recovery period following the flexion was characterised by initial muscle hyperexcitability, which was followed by a delayed hyperexcitability phase.
The development of spasms and hyperexcitability in the multifidus muscle due to creep can have significant implications for human health. Prolonged static lumbar flexion, such as that experienced during prolonged sitting or certain occupational and sports activities, can lead to a "sprain"-like injury to the ligaments. This, in turn, can induce spasms and inhibition in the erector spinae muscles, including the multifidus. The recovery from such disorders may take a considerable amount of time, ranging from days to weeks, depending on the level of creep developed in the tissues.
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It is associated with low back pain and disorders
Muscle creep, also known as muscular creep, is a phenomenon where muscles remain in a state of contraction, even at rest, leading to a sustained shortening of the muscle fibers over time. This can be understood as a gradual and sustained muscle contraction, which can have significant implications for the body, especially in the context of low back pain and related disorders.
The association between muscle creep and low back pain is well-established. When muscles in the lower back, hips, and thighs remain in a state of contraction, it can lead to an imbalance in the spinal alignment and pelvic tilt. This is often seen in individuals who sit for prolonged periods, as the constant pressure on the muscle-tendon units leads to a gradual shortening of the hip flexor muscles, particularly the iliopsoas muscle group. This condition is commonly known as "iliopsoas muscle creep" and is a significant contributor to low back pain.
The iliopsoas muscle group is critical for spinal stability and movement. When this muscle group undergoes creep, it can cause an anterior pelvic tilt, where the top of the pelvis tilts forward, altering the natural curvature of the spine. This altered spinal alignment increases the strain on the lumbar spine and surrounding structures, leading to low back pain, tightness, and even nerve compression in some cases. Additionally, muscle creep in the iliopsoas can contribute to a condition called "anterior pelvic tilt syndrome," which is characterized by a range of symptoms, including chronic low back pain, hip pain, and decreased flexibility in the hips and thighs.
Beyond the iliopsoas, muscle creep can also affect other muscle groups in the lower back and legs, such as the hamstrings and quadriceps. This can lead to a condition called "hamstring muscle creep," where the hamstrings remain in a shortened state, pulling the pelvis into a posterior tilt. This can also contribute to low back pain and postural imbalances. Similarly, quadriceps muscle creep can pull the patella (kneecap) upward, leading to knee pain and patellar tracking disorders.
The implications of muscle creep go beyond just muscle shortening. The constant state of contraction can lead to decreased blood flow in the affected muscles, resulting in reduced oxygen supply and nutrient delivery to the muscle cells. This can contribute to muscle fatigue, pain, and even trigger points, which are sensitive areas within the muscle that can refer pain to other parts of the body. Additionally, the altered muscle length and tension can impact the body's proprioception, affecting balance and coordination, and further contributing to postural disorders and pain.
Addressing muscle creep is essential in preventing and managing low back pain and associated disorders. This involves a combination of approaches, including stretching and mobility exercises to restore muscle length, myofascial release techniques to relieve tension and improve blood flow, and strengthening exercises to improve muscle balance and stability. Additionally, ergonomic adjustments, such as improving sitting postures and taking regular breaks during prolonged sitting, can help prevent muscle creep and reduce the risk of low back pain.
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It can be managed with exercise and proper sleep posture
Muscle creep, or simply creep, is a deformation mechanism that can occur in muscles and other tissues. It is characterised by an initially rapid increase in strain (deformation) followed by a slower increase in strain at a constant stress (load) over time. In other words, muscles and tissues continue to elongate when stretched even if the force of the stretch is not increased.
Prolonged static lumbar flexion, or remaining in a seated position for extended periods, can cause creep in the ligaments of the spine, leading to spasms and inhibition in the erector spinae muscles. This can result in a "sprain"-like injury to the ligaments, which can take days to weeks to recover from, depending on the level of creep.
To manage muscle creep, it is important to avoid remaining in the same position for too long, especially when seated. It is recommended to get up and move every 20 minutes or so, incorporating stretches or exercises such as downward dog or tai chi routines. Additionally, when sitting, ensure that your posture is correct and that your spine is adequately supported. This can help prevent creep in the spinal ligaments and associated muscles.
Proper sleep posture is also crucial in managing muscle creep. Sleeping on a well-supporting mattress that allows the body's curves to be supported while maintaining the spinal joints and ligaments in their neutral positioning is essential. A mattress that is too firm or too soft can contribute to creep and associated issues. Therefore, it is important to test out different mattresses to find one that provides the right amount of support for your individual needs.
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Frequently asked questions
Muscle creep is the deformation of muscles and ligaments in the spine, which can cause spasms and hyperexcitability.
Muscle creep is caused by sustained static or cyclic loading of lumbar viscoelastic tissues, which may occur due to prolonged sitting or certain sports activities.
Symptoms of muscle creep include tightness, muscle tension, and spasms. It can also result in a decreased range of motion and instability in the spine.
To prevent muscle creep, it is important to take frequent breaks from sitting and move around. Sleeping on a well-supporting mattress can also help minimize creep.
Treatment for muscle creep may involve physical therapy or specific exercises to stretch and strengthen the affected muscles and improve spine stability.
