Today when I was at the gym on the stairstepper, I had to quit after only 10 minutes. I did lift weights before this. I was uncomfortably dizzy, my vision was kind of blacking out, and I felt like I was going to pass out. It was quite disturbing.
Was this low blood sugar or over-exertion or what? I'm used to doing lots of running outside, usually between 20 and 30 miles a week. I hadn't, however, did the stairstepper for several months. It was pretty hot in the gym and it's usually cool outside when I'm running.
Also, I just had a light breakfast today, as usual. I like to make sure my body will use fat as fuel because I'm trying to lean up as much as possible.
Anyway, I'm a little concerned about this. I want to lowerer my bodyfat percentage, but almost blacking out suggests that something in my program probably needs adjusted. Should I start eating a bigger breakfast so I have higher blood sugar and don't get dizzy? Or maybe I'm just not used to the intensity of the stairstepper? Any suggestions?