Stimulants and Exercise

Does anyone have experience exercising while taking a stimulant?

I really enjoy running, and I've run quite often. A 7 minute mile used to be a very comfortable pace for me. I'm also in exceptional health.

HR = 52 BPM
BP = 120/75

Then I became depressed. It took me three weeks just to open my mail, but I still managed to work out because I love it so much. However, I started to struggle just to run a mile in 8:30. Eventually, I could hardly even run and I stopped. (Over the course of six months)

I finally went in to see a doctor, and I've been on 300mg Bupropion for about 6 weeks. My doctor said it really shouldn't affect me as long as I don't drink too much alcohol.

It worked on the depression. I feel normal. However, it did raise my HR up to 175 bpm. My doctor knows this wasn't concerned in the slightest.

Anyway, to my point. I went to work out for the first time in months, and I ran a mile in 6 minutes flat without becoming tired. I went a few days later, and I ran two miles in 12 minutes on a slight incline. If I actually chose to push myself, I'm certain I could break into the 4 minute range. (My previous best is 5:30)

This really isn't normal for me, and while I like that fact that i can record great times, I'm worried about its effects on my cardiovascular system. I"m actually afraid to work out like i used to.

The monitoring parameters do not mention heart problems:
</font><blockquote><div id="quote"><font class="small">Quote:</font>
Body weight; mental status for depression, suicidal ideation (especially at the beginning of therapy or when doses are increased or decreased), anxiety, social functioning, mania, panic attacks[/i]
http://www.umm.edu/altmed/drugs/bupropion-017700.htm

I would trust your doctor or question him more closely if you are concerned? It sounds like your cardiovascular system is fine (or you'd notice symptoms other than just increased heart rate) and well trained and I don't know that I would necessarily attribute the better times to the meds; could be backing off because of your depression helped; often that is the way with weight loss, etc. Our bodies need rests/breaks when confronted with plateaus and manage to take them and then go to the next level. I think you're just at the next level for you.

Well, I know Bupropion is a stimulant. (It's banned from many sporting events)

I'm sure a big part of it is the diminished depression though, but probably not all of it.