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I do my cardio first thing in the AM on an empty stomach in order to burn fat for fuel.
Fasted Cardio Ineffective
I was in that camp at one time. However, not any more.
Research along with empirical data indicate otherwise.
Does Cardio After an Overnight Fast Maximize Fat Loss? : Strength & Conditioning Journal
"...the literature does not support the efficacy of training early in the morning on an empty stomach as a tactic to reduce body fat. At best, the net effect on fat loss associated with such an approach will be no better than training after meal consumption, and quite possibly, it would produce inferior results. Moreover, given that training with depleted glycogen levels has been shown to increase proteolysis, the strategy has potential detrimental effects for those concerned with muscle strength and hypertrophy."
Kenny Croxdale
I have bee doing a little research into HIIT and it seems to be the way to go and may actually help you to gain muscle. Where the; I have to stay on the tread mill for an hour may actually break down muscle. Very interesting at the least. I plan on changing up my cardio tomorrow at the gym.
Would fasted cardio (AM) reduce cortisol levels since they're at the highest upon awaking in the morning??
Intense Exercise Elevates Cortisol
"During strenuous and sustained exercise...causes the release of cortisol."
"...Blood levels can be regulated to a significant degree during exercise by controlling glucose availability. ...When athletes were given a 6 percent carbohydrate solution during exercise, cortisol levels dropped by almost 80 percent compared to subjects receiving water." Page 39-40/Nutrient Timing/Drs John Ivy and Robert Portman.
Nutrient Timing
This is a great book. It examines how your training session is enhanced with a Pre, Peri and Post Workout Beverage.
Growth Hormone Via Fasted Cardio
Another factor that is touted about Fasted Cardio is that it produces the release of Growth Hormone. This is true.
Research has shown that carbohydrates ingested before, during or after a training session trigger insulin release.
Insulin depresses Growth Hormone Release.
However, that's not the whole story.
Dietary supplements affect the anabolic hormones after weight-training exercise.
Dietary supplements affect the anaboli... [J Appl Physiol (1985). 1994] - PubMed - NCBI
Research by Ivy demonstrated that elevation in Growth Hormone rebounded 6 hours post workout.
Thus, you're not missing the "Growth Hormone Effect" if you ingest a Pre, Peri and Post Workout Beverage.
EAS Supplement-National Strength and Conditioning Clinic
The Fasted Cardio and Pre, Peri and Post Workout Beverage issue was addressed by Dr John Ivy at this clinic that I attended in Seattle, October 2011.
As per Ivy, an individual who trains in a fasted state and ingest nothing afterward has wasted his/her training time.
Rather than creating an anabolic environment for muscle growth, their fasted training has placed them in a catabolic state.
That meaning that you burned fat and worst of all you burned muscle, as well.
Kenny Croxdale