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Selective hypertrophy of type II muscle fibers
33%
202/606
Decreased concentration of Krebs cycle enzymes
3%
18/606
Increased rate of glycogen depletion
10%
58/606
Increased sympathetic nervous system activity
2%
12/606
Increased storage and utilization of intramuscular lipids
51%
308/606
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Endurance training causes selective hypertrophy of type I muscle fibers. It stimulates an increase in the enzymes of the Krebs cycle which increases the capacity for aerobic ATP resynthesis during exercise. There is a decrease in the rate of glycogen depletion. Depletion of glycogen has been linked to fatigue during endurance exercise. Endurance training blunts the catecholamine response and may contribute to the reduction in heart rate observed for the same exercise intensity following training. The greater use of lipid reduces the contribution of carbohydrate to ATP resynthesis and preserves muscle glycogen.
2.9
(9)
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