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Tonic muscles and phasic muscles are two different types of muscles that work together to keep the body functioning properly. Tonic muscles can be thought of as background muscles, as they act with little to no stimulus and are responsible for holding us upright. They contract slowly and have great endurance. Phasic muscles, on the other hand, activate when we want them to and are responsible for our actions, movements, and gestures. They contract quickly and have poor endurance. When these two types of muscles are out of balance, it can lead to musculoskeletal imbalances and joint instability.
| Characteristics | Values |
|---|---|
| Type | "Background" muscles |
| Activation | With little or no stimulus |
| Function | Holding the body upright |
| Response to Overuse/Underuse/Trauma | Shorten and tighten |
| Response to Poor Posture | Dysfunction |
| Response to Flexion Activities | Dysfunction |
| Response to Gravity | Dysfunction |
| Contraction Speed | Slow |
| Endurance | High |
| Prone to | Overactivity |
| Prone to | Tightening |
| Examples | Pectoralis minor, upper trapezius |
| Relationship with Phasic Muscles | Agonist-antagonist |
| Relationship with Flexors | Most tonic muscles are flexors |
| Relationship with Extensors | Most phasic muscles are extensors |
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What You'll Learn
Tonic muscles are responsible for holding you upright
Tonic muscles can be thought of as "background" muscles. They act with little or no stimulus and are responsible for holding us upright. Tonic muscles contract slowly and have great endurance. They are also prone to overactivity and will tighten when they are overused, which can lead to musculoskeletal imbalance and joint instability.
Tonic muscles are activated in flexor synergies and involved in repetitive or rhythmic activity. Most tonic muscles are flexors, and they are prone to tightness. They are the opposite of phasic muscles, which are fast-twitch and designed for brief bursts of activation. Phasic muscles are responsible for our actions, movements, and gestures. They fatigue quickly and are located farther away from the joints.
When tonic and phasic muscles work together, the body is more stable, has strength when needed, has more energy, and has better posture. However, imbalances between the two types of muscles can lead to dysfunction, especially when combined with poor posture, activities that focus on flexion, and gravity. For example, an office worker who sits at a desk all day may find themselves constantly slouching, not realizing that their overused tonic muscles are pulling their underused phasic muscles into an excessively lengthened position.
To address these imbalances, it is important to understand the differences between tonic and phasic muscles and their influence on each other. This understanding can inform strategic exercise choices that work with the body's design to improve function. For instance, Pilates practitioners have long emphasized creating ideal length-tension relationships in the body to correct posture and restore physical vitality.
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Tonic muscles contract slowly and have great endurance
Tonic muscles are responsible for holding you upright and can be thought of as "background" muscles. They act with little or no stimulus, contracting slowly and exhibiting great endurance. Tonic muscles are prone to overactivity and tend to tighten when they are overactive.
Tonic muscles are activated in flexor synergies and are involved in repetitive or rhythmic activity. Most tonic muscles are flexors, and they are prone to be tight. In contrast, phasic muscles are extensors and are prone to weakness. Phasic muscles are fast-twitch and are designed for brief bursts of activation. They are responsible for our actions, movements, and gestures.
When tonic and phasic muscles work together, the body achieves greater stability, strength, energy, and improved posture. However, imbalances between the two muscle types can lead to dysfunction and musculoskeletal imbalance. For example, in a person who sits at a desk for long hours, the overused tonic muscles can pull the underused phasic muscles into an excessively lengthened position, leading to a hunched posture.
To address these imbalances, strategic flexibility exercises can be employed to relax the tonic muscles, while strength work can stimulate the phasic muscles. Pilates practitioners have long recognized the importance of creating ideal length-tension relationships in the body, which can help correct faulty movement patterns and improve overall function.
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Tonic muscles are prone to overactivity and tightening
Tonic muscles can be thought of as "background" muscles, as they act with little or no stimulus. These muscles are responsible for holding us upright and contracting slowly, and they have great endurance. However, in a deconditioned or improperly trained body, it is easy for tonic muscles to shorten and tighten in response to over-use, under-use, or trauma. Tonic muscles are prone to overactivity and tend to tighten when they are overactive. This is particularly true when the opposing phasic muscles are under-used and lengthened.
For example, consider someone who sits at a desk for long hours and tries to sit up straight but finds themselves slouching. Their over-used tonic muscles (such as the pectoralis minor and upper trapezius) are pulling on their under-used phasic muscles (such as the rhomboids and mid/lower trapezius), causing an imbalance. This imbalance can lead to musculoskeletal issues and joint instability, as the tonic and phasic muscles are often in an agonist-antagonist relationship.
Another example is an individual who performs exercises such as chest presses, shoulder presses, and bicep curls, which can shorten and tighten tonic muscles like the pectoralis minor, levator scapulae, upper trapezius, and biceps. If the opposing phasic muscles are not targeted, this can worsen postural issues such as kyphosis ("hunchback").
To address these imbalances, it is important to understand the differences between tonic and phasic muscles and their influence on each other. Strategic flexibility exercises can help relax overactive tonic muscles, while specific strength work can stimulate under-used phasic muscles. By addressing these imbalances, individuals can improve their body's function, posture, and overall well-being.
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Tonic muscles are background muscles, requiring little or no stimulus
Tonic muscles are considered background muscles, requiring little to no external stimulus to activate. They contract slowly and have great endurance, but are prone to overactivity and tightening when they are overactive. Tonic muscles are responsible for holding us upright and are activated in flexor synergies, involved in repetitive or rhythmic activity.
On the other hand, phasic muscles are fast-twitch and are designed for brief bursts of activation. They are prone to lengthening and weakening when they are underused or overused. Phasic muscles are responsible for our actions, movements, and gestures.
The body requires both tonic and phasic muscles to function properly. When working together, they provide stability, strength, energy, and better posture. However, imbalances between the two types of muscles can lead to musculoskeletal issues and joint instability. For example, in an office worker who spends long hours sitting at a desk, the overused tonic muscles in the upper back and neck, such as the pectoralis minor and upper trapezius, can become shortened and tightened, pulling the underused phasic muscles in the middle and lower back, such as the rhomboids and lower trapezius, into an excessively lengthened position.
To address these imbalances, strategic exercises can be employed to relax the tonic muscles and activate and strengthen the phasic muscles. Pilates, for example, focuses on developing the body uniformly and correcting wrong posture, which can help prevent faulty movement patterns and improve length-tension relationships in the body.
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Tonic muscles are flexors, while phasic muscles are extensors
Tonic and phasic muscles are two different types of muscles with distinct functions and characteristics. Tonic muscles, also known as "postural" muscles, play a crucial role in maintaining posture and opposing gravity to keep us upright. They can be considered “background” muscles, as they act with little or no external stimulus and have a slow contraction rate and high endurance. Tonic muscles are prone to overactivity and tend to shorten and tighten in response to overuse, underuse, or trauma.
On the other hand, phasic muscles are the more "languid" group, activating only when necessary and quickly returning to a relaxed state. They contract quickly due to their fibre distribution and have poor endurance. Phasic muscles are prone to lengthening when weak and can be considered the opposing force to tonic muscles.
The classification of muscles as tonic or phasic was introduced by Dr. Vladimir Janda in the late 1960s. He used electromyography (EMG) to study muscle activity and fatigue resistance. Janda's research revealed that tonic muscles are typically flexors, involved in repetitive or rhythmic activities, while phasic muscles are extensors, working eccentrically against the force of gravity.
The agonist-antagonist relationship between tonic and phasic muscles is important for maintaining proper body alignment and function. However, imbalances between these muscle groups can lead to musculoskeletal issues and joint instability, especially when combined with factors like poor posture, flexion-focused activities, and gravity. For example, in the case of a person with a desk job, their tonic muscles may become overused and tightened, pulling their phasic muscles into an excessively lengthened position, leading to a hunched posture.
Understanding the differences between tonic and phasic muscles is crucial for fitness professionals and practitioners of Pilates, yoga, and other physical disciplines. By recognizing the unique characteristics of these muscle groups, practitioners can design strategic exercise plans to address postural compensations and distortions and improve overall body function.
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Frequently asked questions
Tonic muscles are those that act with little or no stimulus and are responsible for holding the body upright. They contract slowly and have great endurance.
Tonic muscles can be thought of as "background" muscles, whereas phasic muscles activate when we want them to. Phasic muscles are fast-twitch and are designed for brief bursts of activation. Tonic muscles are mostly flexors, while phasic muscles are mostly extensors.
When tonic and phasic muscles work together, the body has more stability, strength, energy, better posture, and more efficient body mechanics.
Imbalances between tonic and phasic muscles can lead to musculoskeletal imbalance and joint instability. This can be caused by poor posture, certain activities, and gravity.
