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Lengthened muscles are those that are pulled long to engage, as opposed to being contracted or shortened. The force generated by a muscle depends on its resting length, known as the length-tension relationship. Lengthened muscles can be weak, but they can also be overactive and dominant over another muscle. Weak muscles are those that are unable to perform at their regular capacity due to some insufficiency, and they can be caused by a variety of factors, including chronic conditions, infections, sedentary lifestyles, and more.
| Characteristics | Values |
|---|---|
| Force generation capabilities | Lengthened muscles don't have enough overlap of actin and myosin filaments, which may cause them to test weak compared to a muscle at ideal resting length |
| Muscle spindles | When a muscle is rapidly lengthened, the muscle spindles are excited and send a message to the CNS, resulting in the contraction of the lengthened muscle fibres |
| Sensation | Lengthened muscles may result in a sensation of tightness |
| Balance | Lengthened muscles help improve balance |
| Appearance | Lengthened muscles change the shape and look of the muscles |
| Strength | Lengthened muscles may be weak |
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What You'll Learn
- Lengthened muscles are weak due to a lack of muscle strength
- Weak muscles can be caused by a chronic condition or infection
- Weak muscles can be caused by Addison's disease, anemia, or diabetes
- Overactive and underactive muscles are reflections of muscle imbalances and posture
- Lengthened muscles can be strengthened by performing isolated exercises
Lengthened muscles are weak due to a lack of muscle strength
Lengthened muscles are not always weak, but they can be. Underactive muscles are lengthened, inhibited, and weak, or hypotonic, meaning they have a chronic decrease in tone. Weak muscles are unable to perform at full capacity due to some kind of insufficiency. This insufficiency can be caused by a variety of factors, including a lack of muscle strength.
Muscles can be perceived as tight due to an underlying strength or stability deficit. For example, hamstrings are often perceived as tight due to a lack of gluteal strength. When the gluteals are weak, the hamstrings get a signal from the brain to increase activity to compensate for the lack of support from the gluteals. This leads to the hamstrings feeling chronically tight.
To strengthen lengthened and weak muscles, isolated exercises that target the specific muscles are often used. This can include exercises that lengthen the muscles, such as stretching, or exercises that strengthen the muscles, such as floor bridges and planks.
It is important to note that the length of a muscle can also impact its force-generating capacity. According to the length-tension relationship, a muscle's force generation capabilities are dependent on its resting length. A lengthened muscle may not have enough overlap of actin and myosin filaments, reducing its ability to produce optimal force.
Additionally, lengthening muscles can have other benefits, such as improving balance. Lengthening the leg muscles creates a grounding effect, providing a strong connection to the floor, similar to the roots of a tree. This lengthening can also change the shape and look of the muscles, as seen in the training of ballet dancers, who incorporate stretch into every movement to lengthen their muscles.
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Weak muscles can be caused by a chronic condition or infection
A lengthened muscle can be weak compared to a muscle at its ideal resting length. This is because a lengthened muscle does not have enough overlap of actin and myosin filaments. However, a lengthened muscle can also become overactive and dominant over another muscle.
Weak muscles can be caused by a chronic condition, such as Addison's disease, anemia, diabetes, fibromyalgia, and chronic fatigue syndrome. Chronic conditions that affect the nerves and how they transmit messages to the muscles can also cause muscle weakness. Examples of such neurological conditions include cervical spondylosis, Guillain-Barré syndrome, botulism, Lambert-Eaton myasthenic syndrome, and multiple sclerosis (MS).
In addition, weak muscles can be caused by an infection. For example, viral infections such as the flu, the common cold, and influenza (the flu) can cause myositis, which is an inflammatory muscular disorder that can lead to muscle weakness. Other infectious conditions that can cause muscle weakness include Lyme disease, meningitis, HIV, polio myositis, and rabies.
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Weak muscles can be caused by Addison's disease, anemia, or diabetes
A lengthened muscle can be weak compared to a muscle at its ideal resting length. This is due to the length-tension relationship, where a lengthened muscle does not have enough actin and myosin filament overlap, which can cause it to test weak. However, a lengthened muscle can also become overactive and dominant over another muscle.
Weak muscles can have various causes, including Addison's disease, anemia, or diabetes. Addison's disease is an autoimmune response where the immune system attacks the adrenal cortex, which is responsible for producing cortisol and aldosterone. Symptoms of Addison's disease include muscle pain, muscle spasms, joint pain, and extreme weakness. Anemia, or a lack of red blood cells, can lead to a reduced oxygen supply to the muscles, resulting in muscle weakness. Diabetes, particularly diabetes mellitus, is associated with muscle loss due to elevated blood sugar levels leading to muscle atrophy. This can result in a decline in skeletal muscle mass and overall physical activity levels.
Addison's disease, a rare disorder affecting the adrenal glands, can lead to muscle weakness through its impact on hormone production. The adrenal glands, located above the kidneys, are responsible for producing vital hormones such as cortisol and aldosterone. When the immune system attacks the adrenal cortex, it impairs the production of these hormones, leading to a range of symptoms, including muscle weakness. The extreme weakness associated with Addison's disease can be sudden and severe, requiring immediate medical attention.
Anemia, another potential cause of weak muscles, is a condition characterized by a deficiency of healthy red blood cells. Red blood cells are crucial for transporting oxygen throughout the body, including to the muscles. When the body doesn't receive an adequate supply of oxygen, it can lead to muscle weakness and fatigue. This is because the muscles rely on oxygen to function properly and produce energy. Anemia can have various causes, including iron deficiency, vitamin deficiencies, or underlying medical conditions.
Diabetes, especially the type known as diabetes mellitus, has been linked to muscle loss and weakness. This is primarily due to the impact of elevated blood sugar levels on muscle atrophy. Research has identified the roles of specific proteins, such as KLF15 and WWP1, in this process. As blood sugar levels rise, the abundance of KLF15 increases, contributing to muscle mass decline. Additionally, elevated blood sugar levels can interfere with the action of insulin, a hormone that promotes the growth and proliferation of cells, including muscle cells. This suppression of muscle cell growth further exacerbates the decline in skeletal muscle mass associated with diabetes.
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Overactive and underactive muscles are reflections of muscle imbalances and posture
Muscle imbalances can be caused by poor posture, stress, repetitive movement, or injury. As a result, the body will continue to move along the path of least resistance, also known as relative flexibility. This pattern can lead to altered reciprocal inhibition, synergistic dominance, and eventual injury.
Overactive and underactive muscles are reflections of these muscle imbalances and posture. Overactive muscles are shortened, tight, and strong (also called hypertonic). They are not necessarily strong or tight, but they are hypertonic or have chronic increased tone. Overactive muscles are also associated with a state of having disrupted neuromuscular recruitment patterns that lead a muscle to be more active during a joint action.
Underactive muscles, on the other hand, are lengthened, inhibited, and weak (also called hypotonic). They may not always be weak and lengthened, but they are hypotonic or have chronic decreased tone. Underactive muscles have disrupted neuromuscular recruitment patterns that lead them to be relatively less active during a joint action.
For example, in the case of someone with lower crossed syndrome, which is a common result of prolonged sitting, the hamstrings become overactive and shortened, while the glutes become underactive, lengthened, and weak. This creates a vicious cycle where the hamstrings continue to get stronger, and the glutes continue to weaken.
It is important to note that the length-tension relationship also plays a role in muscle function. According to Sahrmann (2002), a muscle's force-generating capabilities are dependent on its resting length. A shortened muscle has too much overlap of actin and myosin filaments, while a lengthened muscle doesn't have enough overlap. This means that both a shortened or lengthened muscle could test weak compared to a muscle at its ideal resting length.
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Lengthened muscles can be strengthened by performing isolated exercises
In some cases, a lengthened muscle may be perceived as weak due to an underlying strength or stability deficit. This can lead to a feeling of tightness in the muscle, even if its actual length is normal. This is often the result of the muscle attempting to provide additional stability to the joint. Therefore, to counteract this feeling of tightness, it is important to strengthen the specific muscle or group of muscles that are not providing adequate support.
Isolated exercises can be performed to strengthen lengthened and weakened muscles. This involves targeting specific muscles that require improvement. For instance, in the case of an anterior pelvic tilt, the gluteus maximus and core stabilizers need to be activated through exercises such as floor bridges and planks. Additionally, lengthening the leg muscles can also help improve balance. By working with gravity, lengthened muscles create a grounding effect, providing a strong connection to the floor.
Furthermore, when a muscle is rapidly lengthened, the muscle spindles are excited, resulting in the contraction of the lengthened muscle fibers. This can lead to a sensation of tightness, as seen in individuals with an anterior pelvic tilt, where the hamstrings are lengthened, and the individual feels the need to stretch them. However, it is important to note that stretching may not always be the solution, and strengthening the gluteals may be a more effective approach to allow the hamstrings to relax.
Overall, lengthened muscles can be strengthened through isolated exercises, addressing any underlying weaknesses or imbalances, and improving stability and balance.
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Frequently asked questions
A lengthened muscle is one that is pulled long to engage. Lengthened muscles work the whole muscle from insertion to attachment, or end to end, by pulling them from end to end.
A lengthened muscle can be weak, but not necessarily. Underactive muscles are lengthened, inhibited, and weak (hypotonic). However, a lengthened muscle can become overactive and dominant over another muscle.
The hamstrings are an example of a lengthened muscle. When the pelvis tilts forward, the hamstrings are lengthened. Over time, these muscles can begin to feel "tight".
Weak, lengthened muscles can be strengthened by performing isolated exercises that target the specific muscles.
Muscle weakness may be due to a chronic condition, infection, or lack of use. Conditions that can weaken muscles include Addison's disease, anemia, diabetes, and fibromyalgia.
