Heart rate fat burning percentage

Discussion of peer refereed articles and clinical applications

Moderators: Ironman, Jungledoc, ianjay, stuward

Locked
Manofsteel319
Junior Member
Junior Member
Posts: 271
Joined: Thu May 01, 2008 1:10 pm

Heart rate fat burning percentage

Post by Manofsteel319 » Fri Jun 06, 2008 4:00 pm

Ok HIIT plus diet and weight training is the most effective way to burn fat or is it?

I believe that but my gf is always one to push back on supposed truths. She says that she needs her heart rate to be in the active fat burning range not too high but just like 140 bpm.

At her gym she read something that by elevating her heartrate to higher than that range would instead burned consumed carbs instead of fat. I know the whole Idea of fat burning isn't to actually burn the fat but to burn calories and then make the body have to rely on the fat there fore in fat loss.

What is the truth in that? Does that slow running at a slow pace burn fat? and does fast HIIT immediatly hit the carbs and not aim for fat burn? Thing is I put two and two together and get 4 she questions the 4 answer. LOL.

By the body supposedly burning carbs that in turn is burning calories which in turn would eventually burn fat. Am I right or did I get something wrong along the way?

User avatar
brook011
Associate Member
Associate Member
Posts: 537
Joined: Fri Apr 25, 2008 2:08 am

Post by brook011 » Fri Jun 06, 2008 4:12 pm

There is no fat burning zone, I learned this a few months back. It sure would be nice if you didnt have to work as hard to burn your fat off, but HIIT training induces an anaerobic phase like weight lifting, so your burned fat is for a much much longer period of time than just the seated work in the fat burning zone. Since it also builds muscle as well, you're much more likely to get a shredded look from the muscle built. I wish I understood more about this, but I know others on the board will probably chime in for you on a more detailed and proper explanation.

Manofsteel319
Junior Member
Junior Member
Posts: 271
Joined: Thu May 01, 2008 1:10 pm

Post by Manofsteel319 » Fri Jun 06, 2008 4:17 pm

I just have confusion on the topic because the woman threw a monkey wrench at me. Supposedly fat burning zone is true. It says it at her gym I said her gym people were on crack she said " i knew youd say that " well yea. I'll do some research and see what happens.

User avatar
stuward
moderator
moderator
Posts: 6600
Joined: Sat Mar 10, 2007 5:44 pm
Location: Halifax, NS

Post by stuward » Fri Jun 06, 2008 7:50 pm

Higher intensity training will burn more fat than in the "fat-burning" zone, just a lower percentage. Your right in that you burn more calories at higher intensity and that's what's important. However, people are able to sustain longer workouts at low intensity than at high intensity. Tell her that it's total calories that count and she can burn them a lot faster if she runs faster.

It's interesting that a few sprints 3 times a week works your heart as well as 1 hour of running 5 times/week. Sprinting also doesn't consume your muscles like running. That's probably not relevant for your gf but for you, that's the way to go.

User avatar
pdellorto
Deific Wizard of Sagacity
Deific Wizard of Sagacity
Posts: 5252
Joined: Mon May 28, 2007 8:43 am
Location: New Jersey
Contact:

Post by pdellorto » Fri Jun 06, 2008 8:05 pm

What the other guys said. There is a zone where more fat is burned proportionally than other fuel sources, but so what? Overall, more total fat is burned with higher intensity exercise. If I burn 100 kcals of fat in my fat burning zone out of 150 total kcals burned (numbers made up) vs. burning 450 total kcals burned and 150 kcals of fat burned at a higher intensity, which is better for fat loss? The second is much less efficient at burning fat, but overall it's more successful.

Here's some actual numbers:

http://exercise.about.com/cs/cardiowork ... 22601a.htm


What it boils down to is what I said - you burn a higher percentage of fat at lower intensities, but burn more fat overall at higher intensities. Also, at higher intensities you also promote more post-exercise consumption of calories, better cardiovascular health, etc. The myth of the "fat burning zone" is that there is one, but that it matters.

User avatar
Jungledoc
moderator
moderator
Posts: 7578
Joined: Thu Feb 07, 2008 7:11 am
Location: Kudjip, Papua New Guinea

Post by Jungledoc » Fri Jun 06, 2008 10:34 pm

Yeah. What everyone else said.

When you burn calories, it's not like there are particular calories floating around that you can burn selectively, some from fat, others from elsewhere. You use up so much fuel. If you do it slowly, there is time for the body to convert some fat into fuel to burn. If you are burning fuel slowly enough, most of what you burn can be accounted for by mobilized fat stores. (So I think that the ultimate "fat burning zone" would be sleeping in bed!) But if you burn faster, the body has to get it from somewhere, and will utilize glycogen and glucose.

If you don't replace the glycogen and glucose, the body will go on converting fat to take it's place. According to what I've read, HIIT amplifies this effect.
If at the end of the day, you have burned more calories than you have taken in, the balance in the fat account will be lower.

User avatar
TimD
In Memoriam: TimD
In Memoriam: TimD
Posts: 3129
Joined: Mon Dec 19, 2005 8:04 am
Location: Va Beach, Va

Post by TimD » Sat Jun 07, 2008 6:23 am

John, pretty much what the others have said. But there are diehards out there. Here is a good take on it complete with references, "The heirarchy of fat loss" by Alwyn Cosgrove.
http://www.t-nation.com/readTopic.do?id=1526539
It's completewith referenced studies. To paraphrase what Cosgrove implies, but doesn't come outright and say, is that the "zoe" thing discussed above is the least effecive, but if you like doing the ol' Hamster Dance, go for it. Just don't expect to burn off a lot of fat in the proces.

Manofsteel319
Junior Member
Junior Member
Posts: 271
Joined: Thu May 01, 2008 1:10 pm

Post by Manofsteel319 » Mon Jun 09, 2008 10:34 am

ok I knew I was right. It was all about calories burned. She likes her gym so she assumes her gym is right about everything. They weren't necessarily wrong just not as right as me and my fellow exrx.net ers.

Awesome.

User avatar
brook011
Associate Member
Associate Member
Posts: 537
Joined: Fri Apr 25, 2008 2:08 am

Post by brook011 » Mon Jun 09, 2008 11:03 am

That leaves me with a question. Should HIIT be the only kind of exercise you do? I currently do that 5 days a week usually. Should I be splitting it with standard aerobics?

Manofsteel319
Junior Member
Junior Member
Posts: 271
Joined: Thu May 01, 2008 1:10 pm

Post by Manofsteel319 » Mon Jun 09, 2008 11:10 am

Depends on what you want to do. If your goal is weightloss/fat loss it wouldn't hurt. Don't run yourself into the ground though.

KPj
Deific Wizard of Sagacity
Deific Wizard of Sagacity
Posts: 3482
Joined: Thu Mar 02, 2006 5:49 am

Post by KPj » Mon Jun 09, 2008 11:12 am

Manofsteel319 wrote:They weren't necessarily wrong just not as right as me.
Possibly one of the best quotes i've heard recently. :lol:

* makes note to steal *

"yes, honey, I agree with you. It's not that your wrong, it's just that...well Your not as right as me"

KPj

Manofsteel319
Junior Member
Junior Member
Posts: 271
Joined: Thu May 01, 2008 1:10 pm

Post by Manofsteel319 » Mon Jun 09, 2008 11:16 am

Yea .....she yells at me sometimes...lol hilarious.

Locked