Sam said:I get this question a lot.
The early research had two problems:
1) Some of the studies measured only the insulin response and not the actual glycogen re-
synthesis rate.
2) IIRC, the Zawadzki paper compared the results of 4:1 with 4 g of CHO (no protein). The problem
here is the energy intake in the former is 20% greater.
duh. Thanks for this insight. Like I said, I hadn't read the original literature. OTOH, from a
researcher's perspective, I can see why they may have chosen that hypothesis to test. Appropriate
controls and/or comparisons are sometimes the most difficult thing to figure out.
Quoted message said:
Recently, Louise Burke ( no relation) and others have shown that adding protein does not increase
glycogen synthesis when the energy intake was isocaloric (that is the same amount of energy was
taken in under both methods).
Thanks. I'll see if I can track down the article.
Quoted message said:
Again, in real life people are better off getting a meal than something out of a can.
I agree. I use the recovery drink (slimfast) as something to hold me over until I can get to real
food. After a workout or race, I may be 1/2 hr to almost 2 hr driving home if I have to make any
stops along the way (unless I'm running from my house). If at home, I just use milk until I get
dinner cooked.
Quoted message said:
While I am "blasting" protein, if you will, the addition of protein to sport drinks for benefits
during normal exercise is also a bit overblown.
Are you talking for "short" events, like less than, say, 4 hrs, or are you including ultras in here
also, like 10-24 hrs and more. I think some of the drinks intended for longer events incorporate
protein (sometimes specific amino acids) and fat for specific reasons. Given the assortment of
drinks out there, there's obviously various opinions on what works 😉
One of the reasons I've been curious about some of this stuff, aside from the obvious training
issues, is that some of the cold-weather training (like subzero F for multiple hours, days)
literature that I've been reading suggests there's a number of physiological differences in cold
temperatures, including variation in relative amounts of substrates used. I'm just trying to mesh
knowledge at normal temperatures with the cold weather stuff. Since my primary source on cold-
weather training is a late 1980s handbook, I'm trying to track down more current information as well
as the original studies.
I appreciate you taking the time to provide the informative answers that you have.
Thanks
Dot
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"Success is different things to different people" -Bernd Heinrich in Racing the Antelope