I heard a friend say:
I'm not drinking coffee this week. My body can only process the caffeine if I run at least 15km a week.
I found this claim fascinating - that exercise temporarily increases the caffeine tolerance of the body.
- Additional grogginess when waking up
- Withdrawal headaches
- Decreased empathy
- A decreased ability to listen to orally spoken detail
- A decreased ability to calmly think
My question is: Is there any evidence to suggest that exercise reduces the side effects of caffeine?