KINS 2203 Chapter Notes - Chapter 11: Lactate Threshold, Lactic Acid, Myocyte
21 Mar 2018
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Document Summary
Aerobic training causes adaptations in muscle fiber type, mitochondrial function, and oxidative enzymes. Low-moderate intensity aerobic activities use a lot of type i fibers. With training, type i fibers become larger. Long duration exercise may recruit type iix fibers eventually. Increase in number of capillaries surrounding every muscle fiber. Trained men have more capillaries in their leg muscle than untrained men. More capillaries=greater exchange of gas, nutrients, heat, etc. Increase in capillary density = increase in vo2max. Diffusion of o2 from capillary to mitochondria is a major thing limiting the max rate of oxygen consumption by muscleincreasing density of capillary helps this diffusino. O2 binds to myosin in muscle fiber and is carried to mitochondria. Type ii fibers are really glycolytic so they have less myoglobin= limited oxidative capacity=poor endurance. Increased capacity for oxidative metabolism after training. Improves muscle fibers capacity to make atp. Number and size of mitochondria increase during training.
