It is generally accepted that these larger axons are associated with large motor units that typically innervate the fast, more fatigable fibers.

MG is a chronic, debilitating disease characterized by fatigable weakness of muscles which affects about 15 persons per 100,000.

8) Research has shown that strengthening a weak and fatigable diaphragm may increase its endurance capacity and that standard weaning techniques (ie, syncronized intermittent mandatory ventilation or pressure support coupled with UBTs) may not provide sufficiently intense muscular activity or sufficient rest to improve respiratory muscle endurance.