Food for thought: Ketogenic diets reduce athletes' anaerobic performance, study finds
Of course the punchline is, it's a four day study.
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I wouldn't claim that going keto is a good idea for an olympic sprinter, I have no idea. Glycolytic exercise is glycolytic, I haven't seen anybody deny this in any way that I'd take seriously. The Bear used to say some weird stuff about muscle never really using glucose for energy, but rather using it to make fat to use for energy, that's in the category of not to be taken seriously. Keto dieters do have muscle glycogen, I don't think it's that obvious that they'd all do worse than if they were on a higher carb diet. If we take these researcher's word for it that this study to show whether keto reduces anaerobic capacity was necessary, then since this study wasn't long enough for proper adaptation to the diet, the question must still be up in the air. Given that keto vs. exercise doesn't have a vast literature behind it, it's unlikely that anything near a diligent look at the existing data would fail to acquaint the researchers with the contention that adaptation to the diet is necessary before making any claims about longer-term effects on performance. Heck, they should know this from non-keto dietary intervention studies. So they know about this and don't care, or don't and are negligent. Or maybe they know about it, but it's easier to get a grant for a useless four day study than it is for a longer, relevant study. Too cynical? I wish. There's also the question of effects on body composition. If you look at anaerobic exercise like a benchlift, drop 15 pounds from a weight where you can only do 1 rep, and maybe you can do 5, or 10 reps. Ordinary people might access this system just climbing stairs, so it is important as they say, but even a small weight loss should decrease stair climbing fatigue, sprint speed etc. https://www.sciencedaily.com/releas...80501130858.htm |
If we're familiar with high intensity interval training, we may be aware of its effect on aerobic capacity as well. HIIT is basically an anaerobic challenge. Ironically, the greatest improvement is with aerobic capacity.
The point here is that the belief that some activities rely on anaerobic capacity is in fact incorrect. HIIT can be seen as the activity most dependent on anaerobic capacity, so why does it improve aerobic capacity more than other activities believed to rely on aerobic capacity (therefore train this capacity), i.e. low intensity long duration? The anaerobic/aerobic premise is flawed. All activity relies primarily on aerobic capacity. This ain't what's going on with short term ketogenic challenge. Instead, it's likely some adaptation - a shift - of a different set of mechanisms and pathways needed to digest, absorb and metabolize fundamentally different substrates - carbs vs fats, glucose vs fatty acids. In chemistry, this would be like swapping out all the base chemicals we don't need, and put in all the chemicals we actually need. In chemistry, this is easy, it's just a bunch of vials and bottles and whatnots, just plug and play, get running next day. In biochemistry, the "chemicals" must be made on site. This takes time. During this transition period, output invariably suffers. Once adaptation is complete, output goes back up. 4 days is right smack in the middle of this period, where output is at its lowest. There's a great analogy with an oral glucose tolerance test, where we don't measure before the 2 hour mark, where blood glucose would certainly be sky high, where it would clearly indicate diabetes, if we were just retarded enough to conclude that. |
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Well, excuse me, but my stupid detector just went off. Sure, study ketogenic diets for four days in a sport that relies on glycogen storage, and declare you have found a bad thing. Don't make me HULK OUT. |
Counter-point, without all my usual opinionated BS:
https://www.ncbi.nlm.nih.gov/pubmed/23774282 Quote:
The Kimberly study reports lower Wingate peak power for CRD. The Sawyer study reports higher Wingate peak power for CRD. |
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