I don’t get it!!?

Ok here's the deal: I want to lose weight. Period!

The trainer at the gym said to burn fat during cardio - I should keep my heart rate between 96-134 BPM. I'm 29 so that’s exactly 50%-70% of my max heart rate of 191. At 135, I break a little sweat and don't feel winded at all after a good 45 min on the treadmill. I don't get it:!
Is it too good to be true, instead of working out at my typical 150 HR, I can workout at a measly 135 HR and burn more fat? His claim was that at any HR higher than 135, I'm burning 'sugars' instead. He emphasized that to really actively make changes in your body, which happens on the strength training. Can someone set the record straight? If I can get the results doing a less strenuous workout, great! I do enjoy pushing myself to my limits though and at 135 HR, I'm just doing a little jog.

Thanks for any input!

Answers:
The trainer in your gym is an idiot.

The fact is, fat is burnt or used during all forms of cardio, whether low or high intensity. The primary fuel (60-80%, depending on many factors) at rest and low intensity activities is fat. Yes, it is a matter of predominance of fuel used at different intensities. At lower intensities, a larger proportion of fat is used and at higher intensities, a smaller proportion. However, in ABSOLUTE terms, at higher intensities, more total fat is burnt.

So, at rest, we burn about 60-80% fat and 20-40% sugar
At low intensity exercise / easy activity: 50% fat, 50% sugar
At moderate intensity exercise: 40% fat, 60% sugar
At high intensity exercise: 20-30% fat, 70-80% sugar.

Taken to its (false) logical conclusion, your trainer's advice then should be that to lose "most" fat, you should sit on your *** and do nothing.

The solution to losing fat is burn as many calories as possible. The more calories you burn, the more fat you will burn.

High-intensity exercise is the best way to go if you want to burn the most fat! The added advantage of high intensity exercise is that even after you finish training, you'll continue to burn a lot more calories - and mostly fat calories! This is called excess postexercise oxygen consumption (EPOC).

If it was that easy to get results from a less strenuous workout, you won't see many fat ladies walking on the treadmills in the gym. In fact, they should all be slim!

Ignore your trainer and do your cardio at at least 85% of max heart rate for at least 40 minutes. I guarantee that you will see results within 2 weeks.

Yes that would be a fat burning workout as opposed to cardio or strength trainning.
Forget all this mombo jumbo about target heart rate and stuffs. If you work out harder you will get better results. Have you seen fat marathon runners or fat Tour De France cyclists? They work out hard and their skinny, fit figures speak for themselves.

Lets just say your trainer is right that if your working at a higher HR you burn sugar instead of fat. Your are at 135 heart rate and your body burns fat rather than sugar in your body. Since you didn't use any of the sugar in your body wouldn't it be converted to fat later on since you didn't use it any of it? Seems like back to square one to me.

Who cares at what heartrate, just burn more calories! If you raising your heartrate helps you burn more calories then do it.
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