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As muscle hypertrophy is a response to strenuous anaerobic activity, ordinary everyday activity would become strenuous in diseases that result in premature muscle fatigue (neural or metabolic), or disrupt the excitation-contraction coupling in muscle, or cause repetitive or sustained involuntary muscle contractions (fasciculations, myotonia, or ...
Cases of severe muscle atrophy or destruction may render the muscle too weak to show any reflex and should not be confused with a neuronal cause. [citation needed] Hyporeflexia may have other causes, including hypothyroidism, electrolyte imbalance (e.g., excess magnesium), and drug use (e.g, depressants). [1]
Cerebral atrophy is a common feature of many of the diseases that affect the brain. [1] Atrophy of any tissue means a decrement in the size of the cell, which can be due to progressive loss of cytoplasmic proteins. In brain tissue, atrophy describes a loss of neurons and the connections between them.
The muscle hypertrophy may persist throughout the course of the disease, or may later atrophy, or become pseudohypertrophic (muscle atrophy with infiltration of fat or other tissue). For instance, Duchenne and Becker muscular dystrophy may start as true muscle hypertrophy, but later develop into pseudohypertrophy. [41]
Treatment approaches include impacting the signaling pathways that induce muscle hypertrophy or slow muscle breakdown as well as optimizing nutritional status. [ citation needed ] Physical activity provides a significant anabolic muscle stimulus and is a crucial component to slowing or reversing muscle atrophy. [ 3 ]
Eventually, the motor unit areas grow to a point where reinnervation is no longer possible, resulting in uncompensated denervation of the motor units. This ultimately leads to muscle atrophy and myasthenia. Following an acute poliovirus infection, symptoms such as fatigue, asthenia, and pain are believed to be linked to muscle denervation. [9]
Pseudohypertrophy, or false enlargement, is an increase in the size of an organ due to infiltration of a tissue not normally found in that organ. [1] It is commonly applied to enlargement of a muscle due to infiltration of fat or connective tissue, [2] famously in Duchenne muscular dystrophy.
This usually starts with the observation of bulk, possible atrophy or loss of muscle tone. Neuromuscular disease can also be diagnosed by various blood tests and using electrodiagnostic medicine tests [ 23 ] including electromyography [ 24 ] (measuring electrical activity in muscles) and nerve conduction studies . [ 25 ]