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Muscle weakness is a lack of muscle strength. Its causes are many and can be divided into conditions that have either true or perceived muscle weakness. True muscle weakness is a primary symptom of a variety of skeletal muscle diseases, including muscular dystrophy and inflammatory myopathy.
Asthenia or asthaenia (Greek: ἀσθένεια, literally lack of strength but also disease) is a medical term referring to a condition in which the body lacks or has lost strength either as a whole or in any of its parts. It is a poorly defined condition that can include true or primary muscle weakness or perceived muscle weakness. [10]
Gowers's sign is a medical sign that indicates weakness of the proximal muscles, namely those of the lower limb. The sign describes a patient that has to use their hands and arms to "walk" up their own body from a squatting position due to lack of hip and thigh muscle strength. It is named after William Richard Gowers. [1] [2]
Muscle weakness makes it difficult to perform everyday activities, like getting into a bathtub. Sarcopenia is the degenerative loss of skeletal muscle mass, quality, and strength associated with aging. [19] The rate of muscle loss is dependent on exercise level, co-existing health conditions, nutrition and other factors.
Locomotive syndrome is generally caused by decreased strength of muscles and balance related to ageing and locomotive conditions such as osteoarthritis, osteoporosis and spondylosis. [10] [11] [12] Muscle degeneration becomes more common in people aged 50 or above. On average, they lose 3% of their muscle strength annually. [4]
Myasthenia gravis (MG) is a long-term neuromuscular junction disease that leads to varying degrees of skeletal muscle weakness. [1] The most commonly affected muscles are those of the eyes, face, and swallowing.
The low muscle tone associated with hypotonia must not be confused with low muscle strength or the definition commonly used in bodybuilding. Neurologic muscle tone is a manifestation of periodic action potentials from motor neurons. As it is an intrinsic property of the nervous system, it cannot be changed through voluntary control, exercise ...
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. Muscle atrophy leads to muscle weakness and causes disability.