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Muscle atrophy is the loss of skeletal muscle mass. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. The rate of muscle loss is dependent on exercise level, co-morbidities, nutrition and other factors. In the case of whole crush injuries, fast and slow muscles degenerate and regenerate differently.
| Characteristics | Values |
|---|---|
| Cause | Immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system |
| Effect | Muscle weakness and disability |
| Reversibility | Depending on the duration of disuse and the health of the individual, muscle atrophy may be fully reversed with activity |
| Malnutrition | First causes fat loss but may progress to muscle atrophy in prolonged starvation and can be reversed with nutritional therapy |
| Regeneration | Fast and slow muscles degenerate and regenerate differently after whole crush injury |
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What You'll Learn
- Muscle atrophy is the loss of skeletal muscle mass
- Sarcopenia is the degenerative loss of skeletal muscle mass, quality, and strength associated with aging
- Muscle loss is dependent on exercise level, co-morbidities, nutrition and other factors
- Malnutrition can cause muscle atrophy
- Whole crush injuries can cause muscle degeneration
Muscle atrophy is the loss of skeletal muscle mass
The rate of muscle loss is dependent on exercise level, co-morbidities, nutrition and other factors. There are many proposed mechanisms of sarcopenia, such as a decreased capacity for oxidative phosphorylation, cellular senescence or an altered signalling of pathways regulating protein synthesis, and is considered to be the result of changes in muscle synthesis signalling pathways and gradual failure in the satellite cells which help to regenerate skeletal muscle fibres, specifically in "fast twitch" myofibers.
Muscle atrophy is defined as muscle mass loss and muscle function impairment resulting from an increase in muscle protein degradation and decreases in protein synthesis. Diverse physiopathological stimuli, including disuse, denervation, fasting, ageing, and systemic diseases, can trigger skeletal muscle atrophy. Even if the underlying molecular mechanisms are still not fully understood, an elevated oxidative stress related to mitochondrial dysfunction has been proposed as one of the major contributors to skeletal muscle atrophy. Researchers have described various forms of nutritional supplementation to prevent oxidative stress-induced muscle wasting.
Muscle atrophy due to inactivity can occur if a person remains immobile while recovering from an illness or injury. However, this type of atrophy is reversible with regular exercise and physical therapy. People can treat muscle atrophy by making lifestyle changes, trying physical therapy, or undergoing surgery.
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Sarcopenia is the degenerative loss of skeletal muscle mass, quality, and strength associated with aging
Sarcopenia is the degenerative loss of skeletal muscle mass, quality, and strength associated with ageing. It involves muscle atrophy, a reduction in the number of muscle fibres, and a shift towards "slow twitch" or type I skeletal muscle fibres over "fast twitch" or type II fibres. The rate of muscle loss depends on exercise level, co-morbidities, nutrition and other factors. It is considered to be the result of changes in muscle synthesis signalling pathways and gradual failure in the satellite cells which help to regenerate skeletal muscle fibres, specifically in "fast twitch" myofibers.
Muscle atrophy can be caused by immobility, ageing, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. Disuse causes rapid muscle atrophy and often occurs during injury or illness that requires immobilisation of a limb or bed rest. Depending on the duration of disuse and the health of the individual, this may be fully reversed with activity. Malnutrition first causes fat loss but may progress to muscle atrophy in prolonged starvation and can be reversed with nutritional therapy.
Research has been conducted on the different ways in which fast and slow rat muscles degenerate and regenerate after whole crush injuries. The whole-crush injured rat skeletal muscle was used as a model to explore the regenerating potentialities of fast and slow muscles. Laminin was chosen to follow changes in basal lamina and desmin to visualise new muscular elements.
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Muscle loss is dependent on exercise level, co-morbidities, nutrition and other factors
Muscle atrophy can be caused by immobility, ageing, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. Disuse causes rapid muscle atrophy and often occurs during injury or illness that requires immobilisation of a limb or bed rest. Depending on the duration of disuse and the health of the individual, this may be fully reversed with activity. Malnutrition first causes fat loss but may progress to muscle atrophy in prolonged starvation and can be reversed with nutritional therapy.
Research has shown that fast and slow rat muscles degenerate and regenerate differently after a whole crush injury. The soleus muscle was found to degenerate rapidly, extensively and heterogeneously, while the extensor digitorum longus muscle maintained its basal lamina framework during myolysis.
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Malnutrition can cause muscle atrophy
Muscle atrophy is the loss of skeletal muscle mass. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. The rate of muscle loss is dependent on exercise level, co-morbidities, nutrition and other factors.
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Whole crush injuries can cause muscle degeneration
Muscle atrophy is the loss of skeletal muscle mass. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. The rate of muscle loss is dependent on exercise level, co-morbidities, nutrition and other factors.
Compression syndrome is an indirect muscle injury due to a simple, slow compression of a group of muscles leading to ischaemic damage and thus causing crush substances to enter the blood. Compartment syndrome is a localized rapid rise of tension within a muscle compartment, which inevitably leads to metabolic disturbances akin to rhabdomyolysis. In compartment syndrome, the elevation of the intracompartmental pressure causes the muscle damage and necrosis, whereas in crush injury the compartment pressure elevation is secondary to the muscle damage. In crush injury the muscle damage is due to prolonged direct pressure. As a result of this damage, the muscle cells swell, causing a secondary elevation in the compartment pressure.
In a study on rats, it was found that fast and slow muscles degenerate and regenerate differently after whole crush injuries.
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Frequently asked questions
The rate of muscle degeneration depends on a number of factors, including exercise level, co-morbidities, nutrition, and age.
Muscle degeneration can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system.
Yes, depending on the duration of disuse and the health of the individual, muscle degeneration may be fully reversed with activity. Malnutrition-related muscle degeneration can be reversed with nutritional therapy.
No, fast and slow muscles degenerate and regenerate differently.
