Using a HRM as a tool in weight loss
I joined a gym about 7 months ago. I have about 60-80 lbs to lose (after having 3 babies), and I have lost 25 since joining the gym. But I feel like it's coming off very slowly, a little too slowly.
I have a HRM, and I try to keep my HR between 120-160 for 40-100 minutes 4-6 days a week. I also lift weights 3-4 days a week for 10-20 minutes at a time. I take 1-2 group fitness classes each week (usually a core class and a kickboxing). I see a lot of new muscle definition in my legs and arms, so I think my weight training is good. But I'm losing less than 1 lb a week, and I have a large % of my body to lose.
When I have run with frineds, and kept my HR 165-180 for 10-30 minutes, I have experienced "bonking", where I feel like total yuck for the rest of teh day. So I stopped lettign my HR get above 165 for any length of time. I also notice an amonia "smell" in the back of my throat/nose when I hit 155-165. I have heard that it could mean that I am burning muscle/protein.
So I wonder if I am exercising too hard? I'm afraid that if I slow down, and work at eith a lower intensity or less time, that I will not be able to burn enough calories to lose any weight. (I try to burn 500-700 on my HRM each workout) . I eat a non processed whole foods diet, prob 1400-1800 calories per day.
Any advice on where I should be trying to keep my HR for best weigth loss? TIA!