Post exercise carbohydrates may be counter productive.
Mario Di Pasquale
The usual advice is that carbs, with some protein thrown in, are a necessary part of post exercise nutrition regardless of diet that you're following, including a low carb diet. 9,10 However, that's not true. In fact the use of carbs post training can be counter productive and eliminating post training carbs can have added anabolic and fat burning effects.
That's because the intake of carbs after exercise blunts the post exercise insulin sensitivity. That means that once muscle has loaded up on glycogen, which it does pretty quickly on carbs, insulin sensitivity decreases dramatically.
As you know this statement runs counter to present thinking and research about post exercise nutrition although we've mentioned that one recent study showing that carbohydrate intake after exercise is non contributory to the increase in protein synthesis brought about by the use of a protein hydrolysate post exercise.
First of all it's well known that a single session of exercise increases insulin sensitivity for hours and even days.
Muscle glycogen concentration dictates much of this acute increase in insulin sensitivity after exercise.16 Therefore, an increased availability of dietary carbohydrate in the hours after exercise and the resultant increase in muscle glycogen resynthesis reverses the exercise-induced increase in insulin sensitivity.17
Along with glucose uptake, amino acid uptake and protein synthesis also increase. As well, the use of fatty acids as a primary fuel also rises after exercise since glycogen resynthesis takes priority to the use of glucose for aerobic energy.
However, as liver and muscle glycogen levels get replenished, insulin sensitivity decreases, as does amino acid uptake, protein synthesis and the use of fatty acids as a primary fuel.
By increasing insulin levels and not providing carbs you shunt your body's metabolism to the use of more fatty acids for energy while at the same time keeping muscle glycogen levels below saturation and amino acid influx and protein synthesis elevated for a prolonged period of time post exercise.
This increased capacity for glycogen synthesis, and everything that goes with it, can persist for several days if the muscle glycogen concentration is maintained below normal levels by carbohydrate restriction. By keeping carbs low and protein and energy high after training, you can increase protein synthesis over a prolonged period of time and get long term anabolic effect.
for the entire article.... =
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