{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,25]],"date-time":"2025-10-25T13:56:41Z","timestamp":1761400601435},"reference-count":26,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2012,3,16]],"date-time":"2012-03-16T00:00:00Z","timestamp":1331856000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2012,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:italic>Introduction<\/jats:italic>: We compared motor unit potentials (MUPs) with satellite components recorded in two anterior horn disorders: amyotrophic lateral sclerosis (ALS) and spinal muscular atrophy (SMA, types II and III). <jats:italic>Methods<\/jats:italic>: We analyzed MUPs recorded from biceps brachii muscle, including 209 associated with ALS (12 patients) and 127 with SMA (5 patients). Simulations were applied to determine the origin of satellites in these processes. <jats:italic>Results<\/jats:italic>: MUP parameters differ in ALS and SMA. Simulations indicate that the satellite potential in ALS often originated from a single fiber, whereas in SMA it originated from a group of fibers of smaller diameters than the surrounding ones. <jats:italic>Conclusions<\/jats:italic>: These results suggest that, except for neurogenic factors, the variability of muscle fiber diameters also leads to the formation of MUPs with satellites. This variability seems to be responsible for the differences in the shape of the main and satellite MUP components in ALS and SMA. 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