Doesn't really get that high for me. My intervals are at 2.7/3.4/4.1. According to the machine (so who knows) the most I have gotten up to is 113 at the very beginning of the repeat. Also, I do not do this for the entire duration of the intervals, about 25-30 mts on the 45 mt a.m. and only do it for 15 mts. on the evening session. I was doing a few more minutes but ahve recently brought is down a bit
I use it and just monitor how my body responds. Also, I never sprint, it is a face paced walk on the 4.1 for me.
Oh and low carb??? I never see them .... lol, I'd give anything to be getting to eat half a can of green beans. I just have a stubborn body, not sure what else to say, I end up going pretty extreme.