Dominic Stone
Impaired muscle power is a physical impairment that affects an individual's ability to voluntarily contract their muscles to move or generate force. Athletes with impaired muscle power may use racing wheelchairs and throwing frames in competition. The impairment may be caused by underlying health conditions such as spinal cord injury, muscular dystrophy, post-polio syndrome, or spina bifida. Paralympic classifications group athletes with impaired muscle power together to minimize the impact of their impairments on sports performance and ensure fair competition.
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What You'll Learn
- Impaired muscle power is caused by underlying health conditions
- Spinal cord injuries, muscular dystrophy, and spina bifida are underlying health conditions
- Athletes with impaired muscle power compete in racing wheelchairs
- Dynapenia is used to describe age-related loss of muscle strength
- Paralympic Movement identifies 10 eligible impairment types
Impaired muscle power is caused by underlying health conditions
Impaired muscle power is a health condition that reduces or eliminates an individual's ability to voluntarily contract their muscles to move or generate force. This condition is often caused by underlying health issues that affect the brain, nervous system, muscles, or the connections between them.
There are several underlying health conditions that can lead to impaired muscle power. These include spinal cord injuries, muscular dystrophy, post-polio syndrome, and spina bifida. For instance, spinal cord injuries can result in complete or incomplete paralysis, affecting an individual's ability to move their limbs. Similarly, muscular dystrophy is a neuromuscular disorder that weakens muscles and can lead to impaired muscle power over time. Post-polio syndrome and spina bifida can also cause muscle impairment and affect mobility.
In addition to these, other underlying health conditions such as multiple sclerosis, amyotrophic lateral sclerosis (ALS), autoimmune diseases like Graves' disease, myasthenia gravis, and Guillain-Barré syndrome can also lead to impaired muscle power. These conditions affect the nervous system and the ability of the brain to send signals to the muscles, resulting in muscle weakness and impaired function.
Underlying health conditions causing impaired muscle power can also include thyroid conditions, such as hypothyroidism and hyperthyroidism, which affect the body's metabolism and energy levels, impacting muscle function. Electrolyte imbalances, such as potassium or magnesium deficiencies, can also contribute to impaired muscle power by affecting nerve function and muscle contraction.
Furthermore, age-related factors can also lead to impaired muscle power. Sarcopenia, for example, is an age-related condition characterised by the progressive loss of muscle mass, strength, and function. It is believed to be caused by a decrease in protein production, changes in hormones, physical inactivity, and an unhealthy diet. The rates of sarcopenia increase with age, affecting 5% to 13% of people aged 60 and older, and 11% to 50% in individuals aged 80 and above.
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Spinal cord injuries, muscular dystrophy, and spina bifida are underlying health conditions
Impaired muscle power is a health condition that reduces or eliminates an individual's ability to voluntarily contract their muscles to move or generate force. This impairment can be caused by underlying health conditions such as spinal cord injuries, muscular dystrophy, and spina bifida.
Spinal cord injuries can occur due to various factors, including trauma, infection, autoimmune conditions, and abnormal tissue growth. These injuries can damage the nerves, leading to muscle weakness and curvature of the spine, known as scoliosis. About two out of every 100,000 children in the United States suffer from spinal cord injuries, with males outnumbering females by a ratio of 4:1.
Muscular dystrophy refers to a group of conditions that cause progressive weakness in the skeletal muscles. This weakness can affect the muscles supporting the spine, leading to scoliosis. There are various types of muscular dystrophy, each with its own set of symptoms and severity.
Spina bifida, on the other hand, is a condition that arises during fetal development when the neural tube, which forms the brain and spinal cord, does not close completely. This results in an exposed spine and nerves, leaving them vulnerable to injury. Spina bifida can cause muscle weakness, decreased mobility, and, in some cases, may require surgical intervention. It affects around 1,400 babies born in the United States each year.
These underlying health conditions can significantly impact an individual's muscle power and range of movement, requiring specialized care, treatment, and, in some cases, participation in adaptive sports or Paralympic competitions.
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Athletes with impaired muscle power compete in racing wheelchairs
Wheelchair racing has been a part of the Paralympics since 1960, with athletes competing in specialized racing wheelchairs that differ from traditional manual wheelchairs. Racing wheelchairs are propelled by pushing the wheels on the sides, requiring significant upper body strength and practice to master the technique. Athletes with impaired muscle power are classified according to the nature and severity of their disability, with separate races conducted for each class to ensure fair competition.
The classification system for wheelchair racing includes classes T51-T58 for track and field athletes with spinal cord injuries or amputations who use a wheelchair. Within these classes, there are further distinctions based on the extent of the athlete's movement capabilities. For example, T54 athletes have complete movement from the waist up, while T53 athletes have restricted movement in their abdominals.
Racing wheelchairs must adhere to specific rules and regulations outlined in the IPC Athletics guidelines, including dimensions and features. Custom-made racing chairs can be tailored to meet the unique physical needs and comfort of each athlete, enhancing their performance within the parameters of the rules.
Wheelchair racing distances vary, including sprint, middle, long, and relay races. The sport has evolved over time, with the first international competition organized in 1952 between Britain and the Netherlands, exclusively for athletes with spinal cord injuries. Since then, wheelchair racing has expanded to include other disability groups, and it is now one of the most prominent forms of Paralympic athletics, offering athletes with impaired muscle power the opportunity to compete and excel in their chosen sport.
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Dynapenia is used to describe age-related loss of muscle strength
Impaired muscle power is a health condition that reduces or eliminates an individual's ability to voluntarily contract their muscles to move or generate force. This can be caused by underlying health conditions such as spinal cord injury, muscular dystrophy, post-polio syndrome, and spina bifida.
Dynapenia, derived from the Greek translation for "poverty of strength, power, or force", is a term used to describe age-related loss of muscle strength or power. It is important to distinguish dynapenia from sarcopenia, which specifically refers to age-related loss of muscle mass. While sarcopenia was initially defined solely based on muscle mass, subsequent definitions have included performance criteria. The distinction between the two conditions is important because the decline in muscle strength with dynapenia can exceed the loss of muscle size.
The concept of dynapenia was first introduced by Clark and Manini in 2008 to refer to the functional compromise of the entire neuromuscular apparatus. While the term has not yet achieved widespread usage, there is evidence that it is of clinical significance. Dynapenia is associated with a decrease in the number of functioning motor units and the nervous system's lowered ability to stimulate a full muscle contraction.
The decline in muscle strength due to dynapenia begins around 25 years of age and progresses throughout the lifespan. This loss of muscle strength is a major cause of the increased prevalence of disability in the aging population. Nutritional factors, such as low levels of Vitamin E, carotenoids, selenium, and Vitamin D, may also contribute to the onset of dynapenia.
Identifying and addressing dynapenia is crucial for maintaining physical function, mobility, and vitality in older adults. Resistance and endurance training have been found to be effective measures of exercise therapy, improving muscle metabolism and function, and overall life quality.
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Paralympic Movement identifies 10 eligible impairment types
Impaired muscle power is a condition where a person's ability to voluntarily contract their muscles to move or generate force is reduced or eliminated. This is often due to underlying health conditions, such as spinal cord injuries, muscular dystrophy, post-polio syndrome, or spina bifida.
The Paralympic Movement identifies 10 eligible impairment types for athletes to compete in Paralympic sports. These impairment types are outlined in the "Policy on Eligible Impairments in the Paralympic Movement" within the IPC Handbook. The 10 impairment types include eight physical impairments, as well as vision and intellectual impairments.
Physical impairments encompass a range of conditions, such as impaired muscle power, impaired passive range of movement, limb deficiency, and leg length differences. Athletes with impaired passive range of movement experience restrictions or a lack of passive movement in one or more joints due to underlying health conditions like arthrogryposis or contracture. On the other hand, impaired muscle power results from health conditions that impact the voluntary contraction of muscles necessary for movement or force generation. Examples of athletes with impaired muscle power include Canadian Paralympians Alex and Ilana Dupont, who are wheelchair racing athletes and proud parents to their young daughter.
Vision impairment in Paralympic athletes refers to reduced or completely absent vision caused by damage to the eye structure, optical nerves, pathways, or the visual cortex of the brain. Intellectual impairment, another eligible category, is assessed through the VIRTUS II 1 Eligibility Criteria, and athletes meeting these criteria are listed on the VIRTUS International Eligibility Master List.
Classification is a critical process in Paralympic sports, determining which athletes are eligible to compete and how they are grouped together. This process ensures that athletes are assessed based on the impact of their impairment on their ability to compete in a specific sport. It aims to promote fair competition by minimising the impact of impairments on the competition outcome, with winning determined by skill, fitness, power, endurance, tactical ability, and mental focus, mirroring the factors for success in able-bodied sports.
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Frequently asked questions
Impaired muscle power is when a person has a health condition that reduces or eliminates their ability to voluntarily contract their muscles to move or generate force.
Examples of underlying health conditions that can lead to impaired muscle power include spinal cord injury, muscular dystrophy, post-polio syndrome, and spina bifida.
The Paralympic classifications for athletes with impaired muscle power include T42-44, T45-47, T51-54, T61-64, F42-44, F45-46, and F61-64. These classifications depend on the specific sport and the athlete's level of impairment.
