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Originally Posted by Pscarb it has been proven many times...if the fat falls of you after only doing 20min of cardio that is great but for long term fat burning it is better to walk at a steady pace of 3.5-4mph on a incline this taps into your fat cells much more effeciantly than running like an idiot for 20mins(the more you sweat does not determine how much fat you lose as some guys sweat more than others)..doing cardio between 65%-70% of your max heart rate burns more fat than going full out at Max heart rate for 20min....
but what you have to understand what works for you does not mean it will work for others for you to only do 20min cardio and the fat falls off of you i would say you have a fast metabolism....
also doing cardio on non training days means that you never get a break from training(weights/cardio)and you might fall into the overtraining syndrome.... |
What Pscarb said. Additionally:
What percentage of calories used comes from something called respiratory exchange ratio (RER).
RER is the volume of Co2 produced divided by the volume of O2 consumed. As you work harder, your oxygen demand increases until your oxidative metabolism can no longer supply your muscles with enough to function, they then become anearobic and work without oxygen present. At this point the RER is high so 100% of energy comes from carbohydrate. At low intensity (as in walking) RER is low so almost 100% of energy will come from fat.
Thing is, when you work at a lower intensity you have to work for longer or regardless of the fact you utilised only fat as an energy source you will have used less calories. THe recommendation is to walk for at least 30 minutes preferably 45-hour for any benefit.
A 20 minute run may burn only carbs, but it will burn many more calories than the equivalent at a walking pace.
HTH
SD
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