What do you all think of this?

[boxingfan30]

It's an interesting view on cardio that I found....


Carey, DG. Quantifying differences in the “fat burning” zone and the aerobic zone: implications for training. J Strength Cond Res 23(7): 2090-2095, 2009-The primary objective of this study was to examine the relationship of the “fat burning” and aerobic zones. Subjects consisted of 36 relatively fit runners (20 male, 16 female) who completed a maximal exercise test to exhaustion on a motor-driven treadmill. The lower and upper limit of the “fat burning” zone was visually assessed by examining each individual graph. Maximal fat oxidation (MFO) was determined to be that point during the test at which fat metabolism in fat calories per minute peaked. The lower limit of the aerobic zone was assessed as 50% of heart rate reserve, whereas the upper limit was set at anaerobic threshold. Although the lower and upper limits of the “fat burning” zone (67.6-87.1% maximal heart rate) were significantly lower (p < 0.05) than their counterparts in the aerobic zone (58.9-76.2%), the considerable overlap of the 2 zones would indicate that training for fat oxidation and training for aerobic fitness are not mutually exclusive and may be accomplished with the same training program. Furthermore, it was determined that this training program could simultaneously meet the requirements of the American College of Sports Medicine for both aerobic fitness and weight control. Maximal fat oxidation occurred at 54.2% maximal oxygen uptake (V̇O2max). However, the great variability in response between individuals would preclude the prediction of both the “fat burning” zone and MFO, indicating a need for measurement in the laboratory. If laboratory testing is not possible, the practitioner or subject can be reasonably confident MFO lies between 60.2% and 80.0% of the maximal heart rate.

http://journals.lww.com/nsca-jscr/Ab...__Zone.25.aspx

[M302_Imola]

I'll buy it...that's why I normally perform LISS at 70% MHR. Works for me. Thanks for posting the article!

[boxingfan30]

I found it interesting that at the end they say as high as 80%. Obviously the argument is that while you will burn more calories from fat at say 60-65%.. at a higher intensity you are burning more calories including glyogen storages which will have to be refilled by other carbs you eat anyway.

[boxingfan30]

Ok, so I did a little experiment today. I aimed for about 75% HR... I was close... the average came out to 74%. 1 hour 41 seconds yielded 721 calories burned.

67% 1hour 4 minutes (yesterday came out to 620 calories. The rest of the days this week has been like this one. So 100 more calories burned I guess doesn't seem like much much if done for the 6 days I do it comes out to 1 extra session.

This info is from my polar HR monitor ... supposed to be pretty accurate. Maybe someone will find it helpful.

[M302_Imola]

I found it interesting that at the end they say as high as 80%. Obviously the argument is that while you will burn more calories from fat at say 60-65%.. at a higher intensity you are burning more calories including glyogen storages which will have to be refilled by other carbs you eat anyway.

Yeah I get a little nervous when I creep up to 80% MHR when glycogen stores are already depleted and the goal is to burn fat. I try not to go above 70% for that reason.

Ok, so I did a little experiment today. I aimed for about 75% HR... I was close... the average came out to 74%. 1 hour 41 seconds yielded 721 calories burned.

67% 1hour 4 minutes (yesterday came out to 620 calories. The rest of the days this week has been like this one. So 100 more calories burned I guess doesn't seem like much much if done for the 6 days I do it comes out to 1 extra session.

This info is from my polar HR monitor ... supposed to be pretty accurate. Maybe someone will find it helpful.

Thanks for experiementing...that 100 cals per session could really equate to losing some bodyfat (hopefully not muscle). I'm currently lean bulking but when spring gets here I might up my cardio intensity a bit.