KINE 1020 Lecture Notes - Lecture 37: Elastin, Stretching, Collagen

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 1020
• Professor: Nicolette S Richardson

Document Summary

Increase in size of muscle (also fiber) with strength/resistance/ anaerobic training. Increase in muscle fiber size due to more protein (accretion) as a result of increase protein syntheses. Therefore hypertrophy resulting from training is a result of protein degradation and protein synthesis. Adults: strength gains range from 10-90% (>isometic, hypertrophy gains - range from 5-25, dynamic/resistance ~5% Cycles of degradation (pd) and synthesis (ps) are critical for hypertrophy. Pd peak at end of effort/exercise and slows down in recovery lasting ~24hrs: can stay elevated with chronic conditions (~36hrs) Ps little increase immediately after exercise and reaches peak ~36-48hrs: factors promoting ps are under investigation. Increased density (amount) of na-k pump (na2+-k+-atpase); sarcoplasmic reticulum and t-tubule: results in an improved ca+ handling (important for power/speed activity, hyperplasia (increase in muscle fiber number) 5-6 months: type ii ~35, type i ~20% Athlete vs. untrained: type ii ~132% then ut, type i > ~60% then ut.