92604
Descrição
FlashCards por alexlpeart, atualizado more than 1 year ago
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Criado por alexlpeart
aproximadamente 11 anos atrás
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| Questão | Responda |
| What are the properties of new muscle fibers? | Embryonic myosin, immature ATPase, Metabolically undifferentiated, the embryonic myosin is slowly replaced by fast of slow myosin. |
| What are undifferentiated fibers called? | type IIc |
| At what stage of development would you expect type I fibers begin to develop? | As posture and locomotion develops |
| What percentage of muscle fiber variance is explained by genetics? | 50% |
| Describe the effect of endurance training on muscle fiber composition. What other training effects might we expect to see? | No change in type I fiber % nor hypertrophy of type I fibers. Just a change of type IIx to type IIa thus increasing type IIa % and decreasing type IIx %. We would also expect to see increased oxidative capacity, increased capillarization and increased mitochondria. |
| Describe the effect of weight training on muscle fiber type. | No change type I %, but type I fibers underwent hypertrophy seeing decreased mitochondria and increased contractile proteins. |
| What is the effect of speed and power training on fiber type? | increased size of type I and IIa fibers. Also conversion of type IIa to type IIx and the glycolytic enzymes increased. |
| Give evidence to explain the role of the motor nerve in training induced changes | Cross innervation of muscle motor units so they activate different muscle types compared to before. Adaptions occur as a result of the changed firing pattern of the motor neurons and not due to chemical stimuli. Slow tonic stimulation results in type I fiber conversion, while high burst and infrequent activity results in type II fiber conversion. |
| What is the influence of altitude on muscle fibers? | Altitude causes hypoxia, there is the same number of fibers, reduced fiber size, and reduced oxidative capacity of the muscle. |
| Give some nutritional external influences apart from training to muscle fiber type. | Smoking, alcohol, dietary supplements, creatine. |
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