Central fatigue and serotonin

This is interesting research from University of Copenhagen, Denmark:
Why your brain tires when exercising

in Danish (på dansk):
Derfor bliver hjernen træt, når du dyrker motion

and the scientific article:
Serotonin spillover onto the axon initial segment of motoneurons induces central fatigue by inhibiting action potential initiation


This subject is also exciting:
Acute Exercise Remodels Promoter Methylation in Human Skeletal Muscle

in Danish (på dansk)
Motion ændrer dine muskelcellers genetiske identitet