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# Caffeine: How a man can feel like a boy
- URL: https://www.scottsemple.com/caffeine-how-a-man-can-feel-like-a-boy/
- Published: 2018-03-29T08:06:55.000Z
- Updated: 2019-07-03T13:51:08.000Z
- Author: Scott Semple

The race season is over. Caffeine season has begun.

In my training, I often do fasted, caffeinated runs first thing in the morning. Fasted sessions are one method of depletion training. Starting a training session with low glycogen stores stimulates aerobic adaptations in slow-twitch muscle fiber.

Adding caffeine to a training session [increases the power output for a given intensity](https://ylmsportscience.com/2015/10/05/caffeine-ingestion-performance-in-a-low-or-normal-muscle-glycogen-state-by-ylmsportscience/?ref=scottsemple.com). I can run faster at a given heart rate or at a lower heart rate for a given pace.

In short, it feels awesome.

This video is a juvenile illustration of what it feels like, including:

- The initial boost of performance (@ 1m17s);
- The tempting hubris that always appears (@ 2m07s);
- The greed that quickly follows (@ 2m20s);
- What happens if the glycogen runs out (@ 2m30s); and
- How it feels to get home just in time and eat a croissant (@ 3m03s).