Decline in executive control during acute bouts of exercise as a function of exercise intensity and fitness level

A serious question for your doctor. Is your executive control decline because you are exercising so much  because you are working your good side twice as hard and your bad side 4 times as hard? Rather than any damage to your executive control area? Ask for objective proof that this is the case. This means a 3d representation of your brain scan.
 http://www.ncbi.nlm.nih.gov/pubmed/23146780

Abstract

Studies on the effects of acute bouts of cardiovascular exercise on cognitive performances show contradictory findings due to methodological differences (e.g., exercise intensity, cognitive function assessed, participants' aerobic fitness level, etc.). The present study assessed the acute effect of exercise intensity on cognition while controlling for key methodological confounds. Thirty-seven participants (M(age)=23. 8 years; SD=2.6) completed a computerized modified-Stroop task (involving denomination, inhibition and switching conditions) while pedalling at 40%, 60% and 80% of their peak power output (PPO). Results showed that in the switching condition of the task, error rates increased as a function of exercise intensity (from 60% to 80% of PPO) in all participants and that lower fit individuals showed increased reaction time variability. This suggests that acute bouts of cardiovascular exercise can momentarily alter executive control and increase performance instability in lower fit individuals.