For most bodybuilding purposes, the desired elevation in post-workout insulin is easily achievable through a scoop and one half (45 grams) of whey alone (absent any carbs at all) which can raise insulin levels to 39 mU/l.
What does that strange number-letter combination mean to a muscle head? Well,
when you look at the two Greenhaff, et. al, research together, it suggests that increasing insulin to a range of about 15-30 mU/l maximizes muscle protein balance (muscle protein synthesis minus muscle protein breakdown). Furthermore, recently (December 2010), Staples, and colleagues found that muscle protein balance was maximized at 19 mU/l. These three studies taken together support a position that a ballpark insulin level of about 2-5 times normal fasting insulin levels is all that is needed to maximize muscle protein balance.
Guess what? You can easily achieve these levels of insulin increase (a.k.a. "spike") via drinking most commercial or homemade protein + carb shakes or **gasp** even a whole food meal.
Now this will blow your mind...even eating 600 kcal of pizza (which contains 17 grams of fat) will raise insulin levels to a maximum point of 5.6 times that of fasting levels--so much for needing the "fast" hydrowhey protein and "fast" carbs postworkout.
By the way, the claimed post workout "insulin spike" is not going to speed up glycogen resynthesis immediately after your workout anyway because the first hour of glycogenesis is not an insulin-dependent process.
Alas, if you are some type of endurance athlete then "fast" post workout carbs become more relevant for you, but as shadar explained, 99% of the people reading these boards do not fit the narrow category of individuals who will see a benefit of fast post workout carbs over any type of post workout carb.
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