3min chapter

Inside Exercise cover image

Muscle injury, repair and aging with Dr Abigail Mackey

Inside Exercise

CHAPTER

The Effects of Exercise on Muscle Growth

The evidence for a loss of motor neurons with age is, it's not that strong. We also can't rule out that those people were born with more muscle fibers to start with. And we can see that the athletes had larger total muscle cross sectional area of their thighs. But their muscle fibers were not any bigger than those of the controls. The other possibility is that some of these factors produced by the exercising muscle will be fed back up through the motor neuron to the level of the spinal cord to actually prevent loss of loss.

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