KINESIOL 2C03 Study Guide - Midterm Guide: Myocyte, Muscle Fatigue, Vo2 Max
14 Jan 2014
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Graph: contraction force & duration of contraction so > fog > fg. Mitochondria also use myoglobin which uses oxygen. So fibres have: more & larger mitochondria (allowing for more ox. >oxidative enzyme activity >use of o2 >fatigue resistance. Gives meat its red colour b/c it has red pigment related to oxidative state of iron, change in color after cooking is due to change in ox. Stores o2 don"t rely on just diffusion. Predominance of fast type ii fibres white muscle. Predominance of st muscle fibres (type 1) red muscle fibres (b/c of myoglobin) Type ii fibres have a larger muscle diameter, type i fibres have a smaller diameter. O2 gets into muscle from capillaries that surround the fibre. Type 1 fibres are more efficient b/c you get o2 in the middle of fibre in shorter time. Capillaries are not anatomically part of the motor unit. Mu activity affects the # of capillaries around its fibres & therefore its fatigue resistance.
