I've come across an odd thing that might be of some interest to some of you.
I've been taking whey protein for years for my daily protein requirements (I don't eat mammals or dinosaurs). I usually take it just before a meal and immediately before bed. I've taken my resting and standing heart rate every morning for many years. My morning heart rates have values for resting, normal, and post exercise stress that haven't varied for years. I know exactly what they mean and what to do in response.
Recently I got the bug to change the milk protein I buy. I bought a big container of mixed whey and casein proteins. In less than a week after changing to this stuff, my morning heart rates, especially my standing heart rate fell a lot, even after hard exercise. It was bizarre. Standing heart rate fell by 10 beats. That's a WTF? I've seen standing heart rates of 54, resting heart rate as low as 44. Never seen values like that in all the years I've been doing this. My usuals with whey have been 49 MRHR, 64 MSHR.
So I wondered why and naturally for me, started researching. A little hard to find - who else in the world is interested in this anyway? But maybe I've found something. It turns out that digestion breaks peptides loose from the protein chains found in milk, different peptides from whey and casein proteins. The casein derived peptides are touted as having something to do with sleep and a whole bunch of other things. IOW sleep is deeper, quicker, and more refreshing for a variety of reasons and maybe that's the cause of the MRHR thing. What else could it be? Maybe also a decrease in inflammation?
Thinking back on it, I maybe have fallen asleep faster, etc. I keep track of my perceived sleep quality, and maybe it has been better when using the whey/casein instead of the pure whey. Nothing definite there, because I usually sleep quite well, but maybe.
Anyway, three links to look at:
The protein in question:
This container comes with a giant scoop. I use a 50ml scoop instead, which is plenty. I use 4 scoops/day if I ride or work out, whether whey or the whey/casein blend, the last one immediately before bed. The flavor of the Phase8 is not so great. I think the vanilla might be the best bet.
And another odd thing: There's a claim in the first link that one will burn more calories the next day if one drinks milk or peptides or whatever before bed. I ran across a 53 page discussion on the Crossfit blog about eating ice cream immediately before bed. Some claim that eating quite a large bowl of ice cream immediately before bed will cause one to lose weight, for weeks even. That probably assumes that one is a Crossfit nut and is frequently running calorie-negative anyway. But that is interesting w/r to the peptide thing.
Anyway, drinking milk good, ice cream good, mixed whey/casein extract maybe even better.