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Unformatted text preview: by VEGF (vascular endothelial growth factor) Density of mitochondria (2) Resistance training hypertrophy: actin & myosin synthesis (myofibrils ) FG b FO fibers B. Atrophy: muscle not in use by denervation, tenotomy (cutting the tendon), immorbilization, microgravity, etc. few SO (type I) fibers muscle atrophy with age (= sarcopenia) exception: hibernating black bears & aestivating Australian frogs b no disuse atrophy How? Aerobic mitochondria b ROS b cell damage SOD -ROS: reactive oxygen species (e.g. H 2 O 2 ) SOD: superoxide dismutase...
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- Spring '09