Question

As the speed or running increases toward unsustainable speeds, what trends are observed? (there is one correct answer) Anaerobic glycolysis and lactate production decrease Muscle fibers with larger diameters are recruited A greater percentage of the active muscle fibers are red, oxidative fibers The magnitude of action potentials in the muscle cells increase,

Answer 1

A greater percentage of the active muscle fibres are red , osidative fibres , these are called type I fibres (slow twitch fibres), these fibres are more efficient for long duration such as postural makntainene and running exercise .

Under the given condition , lactic acid production increases to meet the energy demands and rate of glycolysis does not decrease . Magnitude of action potential in the muscle fibres does not increase it remains the same .