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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. Muscle atrophy leads to muscle weakness and causes disability.
Here you can see a typical test where the first lactate threshold is at around 210-215 power output and their second lactate threshold is at 260-265.
The damage to nerves supplying specific muscles may cause muscle twitching (fasciculations) in addition to the weakness. It is sometimes associated with weight loss. [2] Diabetes most commonly causes damage to the long nerves that supply the feet and lower legs, causing numbness, tingling and pain (diabetic polyneuropathy). Although these ...
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.
Nerve compression syndrome, or compression neuropathy, or nerve entrapment syndrome, is a medical condition caused by chronic, direct pressure on a peripheral nerve. [1] It is known colloquially as a trapped nerve, though this may also refer to nerve root compression (by a herniated disc, for example).
Muscles kept in a constant stress position quickly become exhausted and can result in pain and swelling in the lower back, legs, ankles and feet. [ 10 ] [ 11 ] The Occupational Safety and Health Administration (OSHA) has stated that muscle fatigue and musculoskeletal disorders account for "33% of all worker injury and illness". [ 12 ]
Damage to skeletal muscle may take various forms. Crush and other physical injuries cause damage to muscle cells directly or interfere with blood supply, while non-physical causes interfere with muscle cell metabolism. When damaged, muscle tissue rapidly fills with fluid from the bloodstream, including sodium ions.
In this condition water retention is mostly visible in the legs, feet and ankles, but water also collects in the lungs, where it causes a chronic cough. This condition is usually treated with diuretics ; otherwise, the water retention may cause breathing problems and additional stress on the heart.