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Tonic and phasic muscles are two different types of muscles that work together to bring about movement at a joint. Tonic postural muscles are slow-twitch muscles that can stay on for long periods. They are anti-gravity muscles, helping to keep us upright and are constantly negotiating to maintain stability. Tonic muscles are also closer to the joints, have great endurance, are oxygen-fed, and are well-integrated with the brain and vestibular system. They are also more prone to tightness. Phasic muscles, on the other hand, are fast-twitch muscles designed for brief bursts of activation. They are more prone to weakness and are farther away from the joints. Understanding the differences between these muscle types can help improve the body's function and performance.
| Characteristics | Values |
|---|---|
| Type of muscle | Tonic (postural) |
| Function | Help improve performance and maximise efficiency |
| Location | Closer to the joints and bones |
| Activation | Slow twitch, remain "on" for long periods |
| Fatigue | Resistant to fatigue |
| Nutrients | Oxygen-fed |
| Brain integration | Well integrated with the brain and vestibular system |
| Relationship with phasic muscles | Agonist-antagonist |
| Role | Anti-gravity, keep us on our feet |
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What You'll Learn
- Tonic and phasic muscles work together in a cycle of contracting and relaxing to bring about movement at a joint
- Tonic muscles are slow twitch and can stay on for long periods of time
- Tonic muscles are anti-gravity and postural muscles, helping to keep us upright
- Tonic muscles are closer to the joints and bones and have great endurance
- Tonic muscles are more likely to shorten in response to over-use, under-use, or trauma
Tonic and phasic muscles work together in a cycle of contracting and relaxing to bring about movement at a joint
Phasic muscles, on the other hand, are fast-twitch muscles designed for brief bursts of activation. They are farther away from the joints, fed by sugar and starch, and have less integration into the brain. These muscles are available on demand but do not respond to the pull of gravity. They tend to lengthen and weaken in response to overuse, underuse, or trauma. Examples of phasic muscles include the abdominals, gluteals, deep neck flexors, and rhomboids.
The relationship between tonic and phasic muscles is often described as a "natural, physiologically balanced imbalance between two systems". Most tonic muscles are flexors, while most phasic muscles are extensors, and they often have agonist-antagonist relationships, meaning they oppose one another. This opposition allows them to work together in a cycle of contracting and relaxing to bring about movement at a joint. When working together harmoniously, tonic and phasic muscles provide stability, strength, energy, and better posture.
Understanding the differences between tonic and phasic muscles and their influence on each other is important for improving body function and creating ideal length-tension relationships. This understanding can inform the design of exercise programs and help address issues arising from imbalances between opposing muscle groups. For example, strategic flexibility to relax tonic muscles and strategic activation or strength work to stimulate phasic muscles can help prevent postural compensation and distortions. By working with the body's design, we can improve function and address faulty movement patterns.
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Tonic muscles are slow twitch and can stay on for long periods of time
Tonic and phasic muscles work together in a cycle of contracting and relaxing to bring about movement at a joint. Tonic muscles are slow-twitch muscles, meaning they can stay "on" for long periods of time. They are also known as postural muscles because of their tonic or anti-gravity behaviour. Tonic muscles are closer to the joints, have great endurance, are oxygen-fed, and are well-integrated with the brain and vestibular system. They are also closer to the bones.
Tonic muscles are continuously negotiating moment-to-moment to keep us upright in gravity. An example of a tonic muscle is the multifidus, which is connected to the sacrum and the transverse processes of all the vertebrae. This muscle is very close to the bones and helps to protect the joints from shear forces and from being taken too far into an extreme of movement, which can lead to pain and joint wear and tear.
Tonic muscles tend to shorten in response to over-use, under-use, or trauma, which can lead to musculoskeletal imbalance and joint instability. This can also cause the outer muscle group to shorten and tense, which can affect the function of the body. By understanding the differences between tonic and phasic muscles, we can improve the body's function by working with rather than against its design. This can help to prevent postural compensation and distortions with an effective exercise plan.
Strategic flexibility to relax the tonic muscles and strategic activation or strength work to stimulate the phasic muscles is key. For example, specific low-intensity exercises that target the specific muscles needing help can help to regain the right postural muscle control. These exercises can then be blended into current activities to improve performance and maximise efficiency.
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Tonic muscles are anti-gravity and postural muscles, helping to keep us upright
Tonic and phasic muscles are two different types of muscles that work together to bring about movement at a joint. Tonic muscles are anti-gravity and postural muscles, helping to keep us upright.
In the late 1960s, Dr. Vladimir Janda, a Czechoslovakian physiatrist and physiotherapist, distinguished between tonic and phasic muscles using EMG and clinical studies. Tonic muscles are slow-twitch muscles that can stay "on" for long periods of time. They are closer to the joints and bones, have great endurance, are oxygen-fed, and are well-integrated with the brain and vestibular system. Tonic muscles are continuously negotiating moment-to-moment to keep us upright in gravity. An example of a tonic muscle is the multifidus, which is connected to the sacrum and the transverse processes of all the vertebrae.
Phasic muscles, on the other hand, are fast-twitch muscles designed for brief bursts of activation. They are farther away from the joints, fed by sugar and starch, and have less integration into the brain. These muscles are available on demand but are not responsive to the pull of gravity. They tend to lengthen and weaken in response to overuse, underuse, or trauma.
Understanding the differences between tonic and phasic muscles can lead to a deeper understanding of strategic planning, which can reduce joint and back pain associated with postural compensations. By working with the body's design, we can improve its function and address issues caused by imbalances between opposing muscle groups. For example, exercises can be designed to relax tonic muscles and stimulate phasic muscles, helping to prevent postural compensation and distortions.
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Tonic muscles are closer to the joints and bones and have great endurance
Tonic and phasic muscles work together in a cycle of contracting and relaxing to bring about movement at a joint. Tonic muscles are slow-twitch muscles, meaning they can stay "on" for long periods of time. They are also closer to the joints and bones and have great endurance. They are oxygen-fed and well-integrated with the brain and vestibular system. Tonic muscles are the anti-gravity and postural muscles that keep us upright against gravity. An example of a tonic muscle is the multifidus, which is connected to the sacrum and the transverse processes of all the vertebrae.
Postural muscles are important because they support our joints and protect them from shear forces and extreme movements, which can lead to pain and joint wear and tear. They also help improve performance and maximize efficiency. When postural muscles are functioning properly, the outer moving muscles can maximize their power output by working on a stable base.
Phasic muscles, on the other hand, are fast-twitch muscles designed for brief bursts of activation. They are farther away from the joints, fed by sugar and starch, and have less integration into the brain. These muscles are available on demand but are not responsive to the pull of gravity. They tend to lengthen and weaken in response to overuse, underuse, or trauma.
Imbalances between tonic and phasic muscles can lead to dysfunction, especially when combined with factors such as poor posture, activities that focus on flexion, and gravity. Understanding the differences between these muscle groups can help in creating effective exercise plans to prevent postural compensations and distortions.
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Tonic muscles are more likely to shorten in response to over-use, under-use, or trauma
Tonic and phasic muscles work together in a cycle of contracting and relaxing to bring about movement at a joint. Tonic muscles are slow-twitch, meaning they can stay "on" for long periods of time. They are also closer to the joints and bones, have great endurance, are oxygen-fed, and are well integrated with the brain and vestibular system. Tonic muscles are the anti-gravity and postural muscles that help keep us upright.
On the other hand, phasic muscles tend to lengthen and weaken in response to these stimuli. These effects can lead to musculoskeletal imbalance and joint instability when postural and phasic muscles are located on opposing sides of the agonist-antagonist relationship. Phasic muscles are also fast-twitch, designed for brief bursts of activation, and are farther away from the joints.
By understanding the differences between tonic and phasic muscles and their influence on each other, we can improve the body's function by working with its design. This understanding can lead to a deeper understanding of strategic planning, which can help reduce joint and back pain associated with postural compensations. For example, Pilates exercises are designed to "develop the body uniformly" and correct wrong posture.
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Frequently asked questions
Tonic postural muscles are slow-twitch muscles that can stay "on" for long periods of time. They are anti-gravity muscles that help keep us upright.
Tonic muscles are closer to the joints and have great endurance, while phasic muscles are fast-twitch and designed for brief bursts of activation. Tonic muscles are oxygen-fed and well-integrated with the brain and vestibular system, while phasic muscles are fed by sugar and starch and have less integration with the brain.
Tonic and phasic muscles work together in a cycle of contracting and relaxing to bring about movement at a joint. When working together, they provide stability, strength, energy, better posture, and more efficient body mechanics.
Tonic muscles tend to shorten in response to over-use, under-use, or trauma, while phasic muscles tend to lengthen and weaken in response to these stimuli. These imbalances can lead to musculoskeletal issues and joint instability, especially when the muscles are on opposing sides of the agonist-antagonist relationship.
