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Karteikarten von alexlpeart, aktualisiert more than 1 year ago
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Erstellt von alexlpeart
vor etwa 11 Jahre
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| Frage | Antworten |
| What is the protein turn over rate for man? | 1.46% per day |
| Draw a graph to show how soon muscles begin to degrade after we stop using them. Draw on protein synthesis, protein degradation and mean protein gain or loss. | |
| Describe the effects of immobilising a postural muscle. | The EMG becomes phasic meaning fiber types turn from type IIx. type IIx is thought to be the unadapted state of muscles. |
| What happens to the muscle EMG when we immobilize the muscle? | Reduced EMG activity |
| What happens to muscles when we immobilizes them in a shortened and lengthened state? | Shortened muscle leads to atrophy as we lose sarcomeres. Lengthed leads to hypertrophy because we gain sarcomeres. |
| Describe how stretching a muscle while stimulating the muscle might change the results that we see. | We see up to 30% increase in muscle mass in 4 days. Stretching alone might increased muscle protein synthesis. |
| when we immobilise muscles, _____ increases in the connective tissue, meaning the muscle is much _____ than before. | Collagen, stiffer |
| Describe the effect of immobilization on enzyme activity in the muscle. | slow muscles - decreased oxidative enzymes increased glycolytic enzymes Fast muscle - glyolytic enzymes decrease more than oxidative enzymes |
| Give some evidence that neural adaptions are lost more quickly than cross sectional area. | When muscle undergoes atrophy due to lack of use, the CSA decreases by 8% but the max vol contraction falls by 24%. There must be something else decreasing max contraction, must be neural. |
| How can the degree of muscle atrophy be measured? | weight muscle (animal studies only), Anthropometry (skin calipers), scanner such as MRI, DEXA, NMRI, CAT scan, MRT. |
| How long does it take for protein synthesis and degradation rates to change after exercise? | Hours |
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