Posted by: mariaan | 2005/11/23

heart rate % and fat loss

I am 33 years old and need to loose 20 kg. I have started spinning and do some walking. I heard somewhere that you must exercise below 70% of your heart rate in order to burn more fat. Is that the truth and what happens if I go above that?

Also, must I eat breakfast before the spinning or do it on an empty stomache in order to loose more fat?

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Our expert says:
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Hi Mariaan

There's no truth that you must keep heart rate down to burn fat. You burn fat no matter what your heart rate is, the trick is to find the right balance between exercising hard enough to burn more fat, and exercise easy enough so that you can actually do exercise for a long period. If you go out and run as hard as you can, you will actually burn fat at a greater rate than if you go out and run slowly. However, the problem is that you can only run flat out for about a minute or two, whereas you can probably do an hour or so if you go slowly enough. So there is a balance between going hard and going easy, and the trick is to find it. People often use heart rate as a guide, and it can work, but I personally don't think that heart rate is that accurate - the problem is that your 70% may well be quite different to another's, because everyone is different and so making these general guidelines just doesn't work.
I like the example of Janine on the forum - she is right, you have to go for long enough, but also hard enough, and so my advice is that you find an exercise intensity that allows you to exercise for say 45 minutes feeling tired, but not exhausted. You should always feel that by about 2 hours after finishing, you still have something left in the tank, so to speak. if you don't, then you are training too hard. if you feel good right away, then you can probably exercise a little harder.

As for not eating, that won't really work either, all it will do is compromise your trainign session because you will run out of energy. Try not to complicate things - just go out, don't worry about when you ate (except for eating too close to when you exercise, of course, because then you have stomach troubles) and just exercise and make sure you eat well, and things will happen.

Good luck

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Our users say:
Posted by: toyBoy | 2005/11/24

Hi, I am no fitness expert but a cyclist to stay fit and healthy.
No, to say at below 70% you burn MORE fat is not true. The harder and longer you drive the car, the more fuel it uses. So, the "harder" is the effort, and the "longer" is the duration of your exercise. The more of this, the more you burn. Also, below 70% you will not gain any cardio fitness, that is now the fitness of your little heart pumping all its life. I would say click on FITNESS and DIET and start reading and learn how exercise versus food intake work.
Hope FITNESS DOC will also reply

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