92% solution

[nwcanoli]

"Window of opportunity" and "Dextrose & Maltodextrin an in-depth analysis" say "For optimal hydration, consume a 92% water solution in your post-workout shake"
The calculation samples are only accounting for the glucose in the solution - does the protein that goes into a PWO shake have any effect on the gastric emptying or osmolarity?

[Venom]

Effect of Plasma Volume on Myofibril Hydration, Nutrient Delivery, and Athletic Performance

[ QUOTE ]
Post-Workout Nutrition

Post-exercise supplementation is vital. Several nutrients must be consumed in this short period of time such as glucose, maltodextrin, and whey protein. The problem is, the more calories consumed, the slower gastric emptying is. However, having between a 2.5-10% carbohydrate solution has been shown to be almost equivalent in gastric emptying rate to just plain water [27, 9, 19]. Moreover, the glucose sodium co transport system greatly increases fluid absorption compared to plain water, as discussed previously. An additional 500 mg of sodium per liter of water should be ingested [8, 33, 18], and a 92% water solution (including carbohydrates and proteins) . So, following the window of opportunity journal entry, a man with 200 pounds of LBM cutting would have 50 grams of protein, 50 grams of carbohydrates, 550 mg of sodium, and 1,250 milliliters of water post-workout.

[/ QUOTE ]

[TheShanMan]

Yep, add up your grams of carbs AND protein, then divide by .08 to get the amount of water you need!

[nwcanoli]

thanks. yes, I see. I re-read that article. I guess my confusion was that I had also read "Dextrose & Maltodextrin an in-depth analysis", and it mentions the pwo, but only shows the carbs in the calculation:

Importance of water
Gastric emptying ... For optimal hydration, consume a 92% water solution in your post-workout shake. To calculate this, divide the carbohydrate content (in grams) by the fluid volume (in millimeters), and multiply by 100. Thus if you consumed 80 grams of carbohydrates in 1 L of water (1000 mL) you would be having 8% carbohydrates, and 92% H2O (1,3,4,10).

[Hells Fire]

What is meant by gastric emptying and what is the point of gastric emptying post-workout?

[TheShanMan]

Basically it means digesting as fast as possible - you want to get the nutrients to your muscles as quickly as possible as opposed to normal meals that you want your body to digest slowly in order to keep blood sugar levels steady and serve as a continual supply of nutrients.