That's an interesting, albeit depressing, study. I'm a geek, so I entered some of the study info to compare it to the formula I used for calculating BMR.
Honestly, this study doesn't make sense to me. It's not that I doubt that there is some metabolic effect of PCOS, there certainly could be. It's just that the control group BMR numbers given make no sense.
For this study, they used controls with an age of 26 and BMI of 23.3. An average woman is probably about 5'5". To get a BMI of 23.3, she'd weigh about 140 pounds. My BMR calculator says a woman with these stats would have a BMR of 1447. The study claims these women measured with an average BMR of about 1868!
To get a BMR of 1868, I tried entering some other heights/weights. Even a 6 foot tall, 200 pound woman only has a BMR of 1741. I don't know how they could get such high numbers for their controls.
It's so far off, that it is casting some doubts in my mind about the results.
For comparison, the PCOS group averaged age 24, with bmi 26.6. A similar 5'5" woman would weigh about 160 for this bmi. My BMR calculator says her BMR would be 1543. The study measured this group at 1445, which at least seems reasonable.
I can't post links but I used the calculator at bmi-calculator.net/bmr-calculator/
and BMI calculator at nhlbisupport.com/bmi/
Anyway, there probably is a difference in BMR for PCOS vs. non-PCOS. It's just hopefully not as outrageous as 400-700 calories a day
I've never used a HRM or calorie counting device. I'm pretty sure the best way to figure one's personal caloric needs would be to just journal for a while and see what happens to the scale. I don't know, I can only say what worked for me.
Sorry for the lengthy post, but these studies are always interesting to me.