Victor Forge
Muscle tone is the tension in a muscle at rest, which is maintained by an intricate interplay between the skeletal muscles and the nervous system. It is the muscle's response to an outside force, such as a stretch or change in direction. The simple definition of muscle tone is the resistance to passive stretch, but the physiological definition is the normal state of balanced tension of the muscles or low-level contraction or rigidity of your muscles when they are at rest. This tension enables muscles to stabilize joints and maintain posture and balance.
| Characteristics | Values |
|---|---|
| Definition | Muscle tone is the tension in a muscle at rest. |
| Muscle Strength | Muscle strength is defined as the muscle's ability to contract and create force in response to resistance. |
| Muscle Tone and Muscle Strength | Muscle tone and muscle strength are different. |
| Muscle Tone and Physical Appearance | Muscles with high tone are not necessarily strong and muscles with low tone are not necessarily weak. |
| Muscle Tone and Flexibility | Low tone increases flexibility and high tone decreases flexibility, but there are exceptions. |
| Muscle Tone and Physical Disorders | Physical disorders can result in abnormally low (hypotonia) or high (hypertonia) muscle tone. |
| Muscle Tone and Diseases | Hypotonia is seen in lower motor neuron diseases like poliomyelitis. |
| Muscle Tone and Diseases | Hypertonia is seen in upper motor neuron diseases like lesions in pyramidal and extrapyramidal tracts. |
| Muscle Tone and Diseases | Paratonia is associated with dementia. |
| Muscle Tone and Diseases | Tonicity aberrations are associated with many diseases of the eye (e.g. Adie syndrome). |
| Muscle Tone and Surgery | Tonus may be a central consideration in eye surgery, as in the manipulation of extraocular muscles to repair strabismus. |
| Muscle Tone and Neural Circuits | Disorders of muscle tone can arise from dysfunction in neural circuits in the brain, spinal cord, and muscle spindle. |
| Muscle Tone and Spinal Cord | Weight-enduring and low-impact exercises alleviate stress on the spinal cord and decrease the risk of osteoporosis. |
| Muscle Tone and Sleep | Skeletal muscles are usually not very active during REM sleep. |
| Muscle Tone and Posture | Muscle tone helps to maintain posture and balance. |
| Muscle Tone and Reflexes | Muscle tone provides quick, unconscious reflexes to any immediate internal or external stimuli. |
| Muscle Tone and Contraction | Muscle tone is achieved by an intricate interaction between the skeletal muscles and the nervous system. |
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What You'll Learn
Muscle tone and muscle strength are different
Muscle tone and muscle strength are two distinct concepts. Muscle tone is the tension in a muscle at rest, or the muscle's resistance to passive stretch during a resting state. It is the muscle's response to an outside force, such as a stretch or change in direction. Appropriate muscle tone allows our bodies to react quickly to a stretch. For example, if someone quickly straightens your elbow, your bicep muscle will automatically contract to protect you from injury.
Muscle strength, on the other hand, is the muscle's ability to contract and create force in response to resistance. It is what your muscles do when they are not at rest. When you purposefully move a muscle, your brain sends signals to your muscle fibres to contract. The power of your contraction depends on your muscle mass, which can be altered by weight training and exercise. For instance, if someone stretches your arm out straight, your muscle strength is reflected in your ability to contract and actively resist that force.
Low muscle tone, or hypotonia, is characterised by muscles that are slower to react to a stretch and unable to sustain a prolonged contraction. Muscles with low tone are perceived as "lax, flabby, floppy, mushy, [and] dead weight". Those with low tone tend to have increased flexibility and decreased strength, although there are exceptions. People with low tone are generally unable to perform "explosive" movements required in sprinting or high jump.
High muscle tone, or hypertonia, is the opposite, with muscles in a highly reactive state to stretch and high tension. A person with high tone will exhibit a quicker reaction to a stretch and may maintain a prolonged contraction. They are perceived as "tight, light [and] strong". High tone tends to decrease flexibility and increase strength, but again, there are exceptions. People with high tone are generally less suited to activities requiring flexibility, such as dance and yoga.
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High and low muscle tone
Muscle tone is defined as the tension in a muscle at rest. It is the muscle's response to an outside force, such as a stretch or change in direction. Resting muscle tone varies along a bell-shaped curve. Low tone is characterised by reduced muscle tension and decreased muscle strength, while high tone is characterised by increased muscle tension and strength. However, it is important to note that muscles with high tone are not necessarily strong, and muscles with low tone are not necessarily weak. Low tone generally increases flexibility and decreases strength, while high tone has the opposite effect, although there are exceptions. For example, a person with low tone will likely not be able to perform the explosive movements required in sprinting or high jumping, while a person with high tone will usually not be flexible in activities such as dance or yoga.
Low muscle tone, or hypotonia, is characterised by floppy, loose limbs due to constantly relaxed muscles. It can be caused by lower motor neuron diseases such as poliomyelitis and can result in muscle flaccidity, decreased stretch reflex responses, and reduced resistance to passive movement. Hypotonia is commonly associated with ataxic cerebral palsy, caused by damage to the cerebellum, which regulates balance, coordination, and fine motor skills.
High muscle tone, or hypertonia, is characterised by stiff, rigid movements due to continuously contracted muscles. It can be caused by upper motor neuron diseases such as lesions in the pyramidal and extrapyramidal tracts and can present as spasticity or rigidity. Hypertonia can result from any damage to the central nervous system, including the brain or spinal cord, such as a spinal cord injury, stroke, or traumatic brain injury. It is also associated with cerebral palsy, although it is not always indicative of this condition.
Both low and high muscle tone can significantly impact an individual's posture, movements, and balance, and may require specific treatments or therapies to manage the condition and prevent further complications.
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Physical disorders and muscle tone
Muscle tone is defined as the tension in a muscle at rest. It is the muscle's response to an outside force, such as a stretch or change in direction. Physical disorders can result in abnormally low (hypotonia) or high (hypertonia) muscle tone. Hypotonia is seen in lower motor neuron diseases like poliomyelitis and can present clinically as muscle flaccidity, with floppy limbs and decreased stretch reflex responses. Hypertonia is associated with upper motor neuron diseases, such as lesions in pyramidal and extrapyramidal tracts, and can manifest as spasticity or rigidity.
Spasticity is velocity-dependent resistance to passive stretch, while rigidity is velocity-independent resistance. Dystonia and paratonia are also disorders of altered tone, arising from network dysfunction between the basal ganglia and thalamo-cerebello-cortical connections. Paratonia is associated with increased muscle tone and is commonly observed in patients with dementia. It is characterised by increased tissue stiffness and impaired skeletal muscle function due to the formation of cross-links in muscle collagen.
Additionally, muscle atrophy, or the decrease in muscle size and strength, can be caused by disuse or neurogenic factors. Disuse atrophy occurs when muscles are not used enough, leading to a breakdown of muscle tissue. Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that prevent muscle contractions. Examples of conditions that can lead to neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre Syndrome, and spinal cord injuries.
Chronic spinal disorders, overuse of specific muscle groups, and cartilage diseases can also lead to a loss of muscle tone. For instance, Volkmann contracture results in decreased blood supply to forearm muscles, causing muscle death and contractures of tendons in the wrist and hand. Furthermore, genetic disorders such as Hurler syndrome, McArdle syndrome, and various forms of muscular dystrophy can contribute to a loss of muscle tone and strength.
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Muscle tone and sleep
Muscle tone is defined as the tension in a muscle at rest. It is the muscle's response to an outside force, such as a stretch or change in direction. Appropriate muscle tone allows our bodies to quickly respond to a stretch. For instance, if someone straightens your elbow, your bicep muscle will automatically contract in response to protect you from injury.
During sleep, our bodies undergo various changes, including a reduction in muscle tone. Dreaming occurs during Rapid Eye Movement or REM sleep, and during this stage, there is a decrease in muscle tone in many of the body's muscles. This reduction in muscle tone during REM sleep is known as REM sleep muscle paralysis or muscle atonia and is considered a normal part of sleep.
However, in some cases, individuals may experience abnormal muscle activity during sleep, known as REM sleep behaviour disorder (RBD). RBD is characterised by increased muscle tone during REM sleep, which can lead to minor movements like leg twitches or more complex behaviours that may result in injury to oneself or one's sleep partner. The excessive muscle activity during REM sleep is a key marker of RBD and can be a sign of underlying neurological or neurodegenerative diseases, such as Parkinson's disease or dementia.
The diagnosis of RBD typically involves a careful evaluation, followed by a sleep study to confirm abnormal muscle tone during REM sleep. Management of RBD focuses on ensuring the safety of the individual and others in the sleep environment. Determining the mechanisms underlying RBD is crucial as it can help understand and treat other sleep disorders related to disruptions in REM sleep motor control, such as cataplexy/narcolepsy.
In summary, muscle tone and sleep are interconnected, with a decrease in muscle tone being a typical occurrence during the REM stage of sleep. However, abnormal muscle tone during sleep can be indicative of underlying disorders or conditions, such as RBD, which require further evaluation and management to ensure the safety of the individual and those around them.
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Muscle tone and appearance
Muscle tone is defined as the tension in a muscle at rest. It is the muscle's response to an outside force, such as a stretch or change in direction. Appropriate muscle tone enables our bodies to quickly respond to a stretch. For example, if someone quickly straightened your elbow, your bicep muscle would automatically respond and contract in response to protect you from injury.
Muscle tone is achieved by an intricate interaction between the skeletal muscles and the nervous system. This process activates a few motor units at a time, probably in a cyclical approach. Through this approach, muscles never get exhausted thoroughly, since some motor units can recover while others are active.
The appearance of muscle tone is often associated with the idea of a toned body, which is perceived as desirable and healthy. However, it is important to distinguish between muscle tone and muscle strength. Muscle strength refers to the muscle's ability to contract and create force in response to resistance, which occurs when muscles aren't at rest.
There are varying levels of muscle tone, from low tone to high tone. Low muscle tone is perceived as "lax, flabby, floppy, mushy, dead weight", while high muscle tone is perceived as "tight, light, strong". It is important to note that muscles with high tone are not necessarily strong, and muscles with low tone are not necessarily weak. Low muscle tone generally increases flexibility and decreases strength, while high muscle tone generally decreases flexibility and increases strength. However, there are exceptions to these general trends.
Disorders of muscle tone can arise from dysfunction in neural circuits in the brain, spinal cord, and muscle spindle, resulting in either hypertonia or hypotonia. Physical disorders can also result in abnormal muscle tone, with lower motor neuron diseases presenting as hypotonia and upper motor neuron diseases presenting as hypertonia.
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Frequently asked questions
Muscle tone is the tension in a muscle at rest. It is the muscle's response to an outside force, such as a stretch or change in direction.
Muscle strength is defined as the muscle's ability to contract and create force in response to resistance. Muscle strength is what your muscles do when they aren't at rest.
There are two types of muscle tones: firm muscle tone and flaccid muscle tone.
Muscle tone is achieved by an intricate interaction between the skeletal muscles and the nervous system. This process activates a few motor units at a time, probably in a cyclical approach.
