if you were running a marathon, which type of muscle fibers would be most useful to you?

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Related questions

8- SO fibers (red muscle fibers) contain a lot of/ small amount of myoglobin which serves to provide more energy for prolonged activity such as marathon running or playing tennis/for quick and powerful burst of energy such as in running away quickly from a danger heavy weight lifting. Physical conditioning increases the number of fast oxidative glycolytic (FOG) pink or yellow/ SO (red) / FG (white)

6- Fast glycolytic (FG) or white muscle contain a large number of myobrils. They are designed for quick and powerful burst of energy such as in running away quickly from a danger heavy weight lifting. Prolonged activity results in anaerobic cell respiration causing fatique/ to provide more energy for prolonged activity such as marathon running or playing tennis.

If testosterone increases both protein synthesis and the number of satellite cells, muscle growth would be increased via:

i) ________________________________ of muscle fibers, and ii) ____________________________ of muscle fibers.