[quote]mkral55 wrote:
Good thing to discuss, just don’t ignore what the hours of effort are teaching you, to sum it all up. [/quote]
Exactly! Combine what the science throws up with your personal experience. Learn from both to get the best results.
A while back the poplar myth was that working out for hours in the mythical ‘fat burning zone’ was the only way to burn fat. You’d be lynched if you suggested that “hey - maybe this doesn’t work!”. Nowadays it’s swung the other way - long duration cardio is bad - the new holy grail is short, high intensity intervals.
Over and over you hear people say “But it isn’t working for me!”. And they’re told “Well your diet must be wrong”. Maybe, just maybe the latest trend peddled by the fitness industry isn’t quite what it’s cracked up to be?
My conclusion so far from delving into the research is that really you need to work at all intensities for the best results when it comes to calorie burn AND a strong cardiovascular system. (That’s what my experience tells me too).
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High intensity increases growth hormone production. That’s good for muscle growth and for fat distribution (less belly fat). But a number of studies have shown it isn’t resulting in any significant calorie burn.
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High intensity training burns more calories than low intensity. But duration is very significant. If you train at very high intensity you won’t be able to keep it up for long so total calorie burn will be lower than say, one hour of pretty hard but sustainable running.
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Low intensity long duration 30 - 90 minutes at around 70% of max heart rate does have fitness benefits that can’t be achieved through high intensity training. It can also be done as a recovery exercise as it takes little out of you. It will burn a decent number of calories because of the duration. So it shouldn’t be dismissed as useless as part of a more comprehensive training plan.
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You don’t need to worry about long duration cardio eating muscle. It’s only after about 90 minutes that the body starts to use protein for fuel (apparently - I haven’t found an awful lot of research on this, but that seems to be the case from what I’ve read??)
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You burn more calories when you lack conditioning. The better you get at something the fewer calories it burns. Varying intensity and duration regularly is one way to ensure that you’re taking advantage of all your ‘easy calorie burn’.
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Research shows that exercise can have a big impact on appetite. Studies have shown that the hormones that tell you that you’re full are increased after intense exercise - and the studies have also shown that people tend to eat less as a result. One study of runners and walkers showed that after several months of consistent training the runners (without realising it) learned to not overeat (improved self-regulation). The walkers however ate more. Most people seem to be less hungry after high intensity training. However, everyone is different. But if a certain type of training intensity reduces your appetite it makes sense to do more of it if fat loss is your goal.
At the end of the day you need to try these things an see what works. And also you need to weigh up how well they fit into your other training goals. Hope this helps someone else. I can post up research links if anyone specifically wants to find out more about any of it.
Also very interested to hear from anyone that’s unearthed any more research and info on this subject