not to try and move the sprinter vs. distance body type debate off topic, but I am curious about the above quote. Was it only HI sprinting that did this to you, or HI training in general (ie. weightlifting, plyos, etc)? And have you been experiencing “runner’s high” since switching?
My roommate from my freshman year of college actually exhibited withdrawal symptoms when he was forced to take a week off from distance running in between xc and indoor (couldn’t eat or sleep, was so anxious he was constantly freaking out and just in general looked like a corpse; all symptoms gone after two days of running again).
In my experience, I’m not sure about pure speedwork, but post-resistance training and post-controlled speedwork/intensive tempo I definitely feel a “high” that carries into the next day, and the day after offdays is when I’ll feel the depression-like feelings (as opposed to after speedwork days). Distance running (did a year or so of xc in early high school) never really seemed to do the trick for me. Almost like I feel a boost from the intense CNS stimulus whereas you seem to have felt a dip