Why do natural bodybuilding contests for the most part look like swim meets minus the pool?
The obvious answer is the relative absence of anabolic and androgenic drugs that enable “enhanced” athletes to hold on to considerably more muscle under prolonged metabolic stress than natural pre-contest trainees. The other part of the answer is that naturals as a group tend to undermine their efforts by copying the training and nutritional practices of their pharmacologically advantaged brethren.
I wrote this review in the hopes of slowly but surely prying open some minds (including my own) by bringing the facts to light. Sometimes concepts can’t be sufficiently conveyed through cyber debates, where emotionally-driven flexing and posturing for the public take priority over honest, objective, and thorough examination of the evidence. I’ll take a look at the hard data, as well as the theoretical extrapolations involved with this highly misunderstood topic.
Warning: This is gonna be lengthy, so save this reading for when you can really sit down and buckle up. I highly encourage you to tread slowly and carefully through the material. For you skimmers out there, I provided summaries of the key research points.
THE “FAT BURNING ZONE” ON TRIAL
Substrate Utilization 101: Origin of the myth
Dietary variables aside, the body’s proportional use of fat for fuel during exercise is dependent upon training intensity. The lower the intensity, the greater the proportion of stored fat is used for fuel. The higher the intensity, the greater proportional use of glycogen and/or the phosphagen system. But this is where the misunderstanding begins. Common sense should make it obvious that although I’m burning a greater proportion of stored fat typing this sentence, Getting up and sprinting would have a greater impact on fat reduction despite its lesser proportional use of fat to power the increased intensity. Alas, sufficient investigation of the intensity threshold of maximal net fat oxidation has been done. In what’s perhaps the best designed trial of its kind, Achten & Jeukendrup found peak fat oxidation to occur during exercise at 63% VO2 max. This peak level got progressively less beyond that point, and was minimal at 82% VO2 max, near the lactate threshold of 87% [1].
Misunderstanding is perpetuated in fitness circles
It has been widely misconstrued that a greater net amount of fat is burned through lower to moderate intensity work, regardless of study duration and endpoints assessed. In addition the confusion of net fat oxidation with proportional fat oxidation, the postexercise period is critically overlooked. No distinction is ever made between during-exercise fat oxidation, recovery period fat oxidation, total fat oxidation by the end of a 24-hr period, and most importantly, a longer term of several weeks.. Thus, the superiority of lower intensity cardio continues to be touted over the more rigorous stuff that takes half the time to do. Fortunately, we have enough research data to gain a clear understanding. Let’s dig in.
DISSECTING THE RESEARCH
Mixed study protocols + mixed results = plenty of mixed-up bodybuilders
As with all research involving applied physiology, the highly mixed set of results is due to a wide variation of study designs in terms subject profile, dietary manipulation, energetic balance, and actual intensities used. Nevertheless, the body of exercise-induced fat oxidation research can be easily deciphered by stratifying it into 3 subgroups: Acute effect (during exercise & immediately after), 24-hr effect, & chronic effect (results over several weeks).
Acute effects spawn ideas for further research
In addition to measuring fat oxidation during exercise, most acute effect trials look at fat oxidation at the 3 to 6 hr mark postexercise [2]. Fat oxidation during exercise tends to be higher in low-intensity treatments, but postexercise fat oxidation tends to be higher in high-intensity treatments. For example, Phelain’s team compared fat oxidation in at 3hrs postexercise of 75% VO2 max versus the same kcals burned at 50% [3]. Fat oxidation was insignificantly higher during exercise for the 50% group, but was significantly higher for the 75% group 3 hours postexercise. Lee’s team compared, in college males, the thermogenic and lipolytic effects of exercise pre-fueled with milk + glucose on high versus low-intensity training [4]. Predictably, pre-exercise intake of the milk/glucose solution increased excess postexercise oxygen consumption (EPOC, aka residual thermogenesis) significantly more than the fasted control group in both cases. The high-intensity treatment had more fat oxidation during the recovery period than the low intensity treatment. This implicates pre-fueled high-intensity training’s potential role in optimizing fat reduction while simultaneously setting the stage for quicker recovery.
24-hr effects come closer to reality
You can call it Murphy’s Law, but the promise of greater fat oxidation seen during and in the early postexercise periods of lower intensity cardio disappears when.......
Finish reading this article here at Myths Under The Microscope: The Low Intensity Fat Burning Zone & Fasted Cardio
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