Dominic Stone
Muscle tone, or residual muscle tension, is the continuous and passive partial contraction of muscles or a muscle's resistance to passive stretch during a resting state. It is regulated by the activity of motor neurons and can be affected by factors such as age, disease, and nerve damage. Muscle tone is important in maintaining posture and balance, and it can vary from person to person, with some having high or low muscle tone. Disorders or abnormalities in muscle tone can lead to conditions such as hypertonia or hypotonia, which are associated with either high or low muscle tension, respectively. Understanding muscle tone is crucial for fields like physical therapy, where distinguishing between muscle tone and strength is essential for treating patients effectively.
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What You'll Learn
Muscle tone defined
Muscle tone, or tonus, is the continuous and passive partial contraction of muscles or the muscle's resistance to passive stretch during a resting state. In other words, it is the tension in a muscle at rest and the muscle's response to an outside force, such as a stretch or change in direction. Both extensor and flexor muscles are involved in maintaining a constant tone while at rest, which helps maintain posture and balance. Muscle tone is regulated by the activity of motor neurons and can be affected by factors such as age, disease, and nerve damage.
Low muscle tone, or hypotonia, is characterised by slower reactions to stretch and an inability to sustain prolonged muscle contractions. It is often described as "lax, flabby, floppy, mushy, or dead weight". Hypotonia can be caused by lower motor neuron diseases like poliomyelitis and can result in muscle flaccidity, decreased stretch reflex responses, and reduced resistance to passive movement.
High muscle tone, or hypertonia, is characterised by an "over-reactive" state to stretch and high tension. Individuals with hypertonia may experience prolonged muscle contractions and have difficulty relaxing their muscles, potentially leading to a loss of range of motion and orthopedic concerns. Hypertonia can be associated with upper motor neuron diseases, such as lesions in the pyramidal and extrapyramidal tracts. It can manifest as spasticity, which is velocity-dependent resistance to passive stretch, or rigidity, which is velocity-independent resistance.
Abnormal muscle tone can also present as paratonia, associated with dementia, and dystonia, resulting from network dysfunction between the basal ganglia and thalamo-cerebello-cortical connections. The balance between muscle tone in flexor and extensor muscle groups is critical for maintaining normal function, and disruptions in this balance can lead to muscle cramps.
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High and low muscle tone
Muscle tone is the continuous and passive partial contraction of muscles or the muscle's resistance to passive stretch during a resting state. It is regulated by the activity of motor neurons and can be affected by factors such as age, disease, and nerve damage. Resting muscle tone varies along a bell-shaped curve, with low tone perceived as "floppy" and high tone perceived as "tight". It is important to assess several factors before deciding if a person has high, low, or normal muscle tone.
Low muscle tone, or hypotonia, is characterised by reduced muscle tension and decreased muscle strength. Individuals with low muscle tone generally have floppy, loose limbs due to constantly relaxed muscles. This can impact functional tasks such as rolling in bed, standing, and walking. Low tone generally increases flexibility and decreases strength, and a person with low tone will likely not be able to engage in "explosive" movements such as sprinting or high jumping.
High muscle tone, or hypertonia, is characterised by increased muscle tension and reactivity to stretch. Individuals with high muscle tone may experience stiff, rigid movements due to continuously contracted muscles. High tone generally decreases flexibility and increases strength, and a person with high tone will usually not be flexible in activities such as dance and yoga. High muscle tone may also lead to a limited range of motion and abnormal postures if not properly managed.
Both low and high muscle tone can be addressed through physiotherapy and rehabilitative therapies such as physical, occupational, and speech therapy. These therapies aim to improve muscle strength, flexibility, and functional abilities, as well as maximise independence in daily activities. Electrical stimulation, hydrotherapy, and deep tissue massage are also used to enhance muscle contraction and stimulate motor nerves.
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Disorders of muscle tone
Central hypotonia originates from the central nervous system, while peripheral hypotonia is related to problems within the spinal cord, peripheral nerves, or skeletal muscles. Severe hypotonia in infancy is known as floppy baby syndrome. In adults, hypotonia can be caused by conditions affecting the brain, central nervous system, or muscles, such as lower motor neuron diseases like poliomyelitis. It can also be caused by genetic conditions, such as Down syndrome and Prader-Willi syndrome. In some rare cases, it may be caused by botulism infections or exposure to poisons or toxins.
Hypertonia, on the other hand, is characterized by increased resistance to passive movement and is associated with upper motor neuron diseases like lesions in the pyramidal and extrapyramidal tracts. It can manifest as spasticity or rigidity. Spasticity is velocity-dependent resistance to passive stretch, while rigidity is velocity-independent resistance. Parkinson's disease (PD) is an example of a disorder associated with hypertonia, where rigidity is one of its cardinal signs.
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Muscle tone and strength
Muscle tone and muscle strength are two distinct concepts, though they are related to one another. Muscle tone refers to 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. This tension is a reflex that helps guard against danger and maintain balance. Appropriate muscle tone enables our bodies to quickly respond to a stretch. For example, if someone straightens your elbow, your biceps 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 through weight training and exercise. Strength training, for example, can increase lean muscle mass and reduce body fat, leading to a more "toned" appearance. This "toning" refers to working on muscular endurance, rather than size.
The terms "high tone" and "low tone" are used to describe an individual's muscle tone. "High tone" is perceived as "tight, light, strong", while "low tone" is perceived as "lax, flabby, floppy, mushy, dead weight". However, it is important to note that muscles with high tone are not necessarily strong, and muscles with low tone are not necessarily weak. Generally, low tone increases flexibility and decreases strength, while high tone decreases flexibility and increases strength. A person with low tone will likely be unable to perform "explosive" movements, such as sprinting or high jumping, which require high tone. Conversely, a person with high tone will usually be less flexible, as seen in activities such as dance and yoga.
Disorders of muscle tone can arise from dysfunction in neural circuits in the brain, spinal cord, and muscle spindle. These disorders can manifest as hypertonia (high muscle tone) or hypotonia (low muscle tone). Hypotonia can be seen in lower motor neuron diseases like poliomyelitis, presenting as muscle flaccidity and decreased stretch reflex responses. Hypertonia, on the other hand, is observed in upper motor neuron diseases, such as lesions in the pyramidal and extrapyramidal tracts, and can present as spasticity or rigidity.
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Muscle toning exercises
Muscle tone is the continuous and passive partial contraction of muscles, or the muscle's resistance to passive stretch during a resting state. It is regulated by the activity of motor neurons and can be affected by factors like age, disease, and nerve damage. Low muscle tone is perceived as "floppy" or "lax", while high muscle tone is perceived as "tight" and "strong". Now, let's dive into some exercises that can help improve muscle tone:
Toning Exercises:
Arms:
- With your feet hip-width apart, create a T-shape with your arms. Contract your butt and stomach muscles while keeping your spine straight and hips facing forward. Rotate your arms so your palms face forward. This can be done with resistance bands or small weights for an added challenge.
- Using resistance bands or light weights, stand with your feet hip-width apart and contract your butt and stomach muscles. With your elbows tucked in, hold the weights or bands with your palms facing up at hip height. Slowly bring the weights/bands up towards your shoulders, hold, and then lower them back down.
- Stand with your feet shoulder-width apart and your palms facing forward. Raise your arms up and out to the side until they reach shoulder height, and then lower them back down. Keep your hips facing forward and your spine straight.
Abs:
- Lie on your back with your knees bent and your heels on the floor, away from your butt. Bend your arms with your elbows out wide and place your hands by your ears. Engage your core, raise your shoulder blades slightly, and then slowly lower them back down.
- Lie on your stomach with your arms by your side. Lift your head and arch your back off the floor, and then slowly lower it back down.
Legs:
- Running and jogging are great weight-bearing exercises for your calves and thighs, and they also strengthen bones to help prevent osteoporosis.
- Biking works your quadriceps, hamstrings, and calves. Using toe clips adds resistance by allowing you to pull the pedal up and down. Adjusting the resistance on a stationary bike can also provide a challenging workout.
- Squats strengthen your lower body and core, increase flexibility in your legs and hips, and burn calories due to working the large muscles in your body.
Full Body:
- Swimming laps works the muscles above your waist, especially your arms and shoulders, depending on the stroke.
- Tennis is a great way to tone your arms, chest, and shoulders.
- Bowling can strengthen your forearm, shoulder, and leg muscles.
- Golfing, especially if you walk the course, can provide a full-body workout.
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Frequently asked questions
Muscle tone is the continuous and passive partial contraction of muscles or the muscle's resistance to passive stretch during a resting state.
Muscle tone is defined as the tension in a muscle at rest, whereas muscle strength is the muscle's ability to contract and create force in response to resistance or active movement.
Low muscle tone is perceived as "lax, flabby, floppy, mushy, dead weight". Muscles with low tone are slower to react to a stretch and are unable to sustain a prolonged contraction.
High muscle tone is perceived as "tight, light, strong". Muscles with high tone are in an “over-reactive” state to stretch and have high tension.
Physical disorders can result in abnormally low (hypotonia) or high (hypertonia) muscle tone. Hypotonia is seen in lower motor neuron diseases like poliomyelitis, while hypertonia is seen in upper motor neuron diseases like lesions in pyramidal and extrapyramidal tracts.
