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| Im going to need more meat than this... |
A big debate in the fitness and strength training world is "how much protein should I consume post training?" We have swung from "
make sure you get at least 2g/lbs of protein" to the conservative "
more than 20g of whey are a waste of money" put forwards by dieticians today (lest your kidneys explode). On top of this is the how much protein should I eat a day question, which I am asked semi regularly. To state the science here is a summation of what we know according to evidence at the moment.
Current evidence suggests
http://dx.doi.org/10.1136/bjsports-2012-091100 ,
Phillips 2004
- We need intakes higher than the RDA, to be precise, 1.2-1.6g/kg body weight a day
- An emphasis on leucine rich protein sources (Leucine sources)
- An additional protein shake immediately after your workout
- Multiple servings of 20-25g of protein spread equally across the day
A study by
Yang (2012) has shown the effects of different doses (10g, 20g, 40g) of whey protein alone or in
combination with a single leg exercise on
myofibrillar protein synthesis. While not keen on unilateral analysis they concluded that "Given the evidence that
the muscle protein synthetic response following resistance
exercise is blunted in aged muscle, our data and that of
others
suggest that consuming a relatively high amount of
dietary protein after resistance exercise may, potentially,
increase rates of MPS in the elderly to the same extent as in
young adults."Suggesting that 40g doses resulted in higher protein synthesis than the 10 and 20g doses. So if in doubt go bigger post training.
Another study however suggested that 20g doses are adequate when having consumed a high protein meal in the 3 hours preceding your training.
Jackman 2012 concluded "Our results are the first to show that when exercise is performed 3h following food intake there is a limit to the rate of post-exercise MPS following protein ingestion. Whey protein ingestion above 20g does not provide any additional benefit to MPS."
A reasoned approach would be to consume a fast digesting protein posting training and mixing 20-25g into your diet through out your daily feedings to achieve that 1.2-1.6g/kg of bodyweight target. For instance a 85kg athlete will need roughly 100-136g of protein a day to achieve muscle gain and body composition objectives, so our 4-5 servings of 25g of protein a day rings true.
While we know that protein supports, lean mass gains, weight loss, strength building, we have in the past risked over shooting and or undershooting what we need. As nutrition sciences gets a clearer picture of what we really need we can hopefully break away from dogmatic notions on protein consumption.
If you are interested in learning more I suggest reading
Phillips 2004