KingProtein
New Member
We've been told that protein synthesis is elevated for up to 36-48 hours post workout. We've also been told that there is a postworkout 'window of opportunity' where much of what we eat is going towards muscle growth.
My question is, are we confusing the high glycogen restoration rates postworkout with actual protein synthesis? Is there really any major muscle growth going on at this time?
Studies I have found are contradictory;
In;
Mixed muscle protein synthesis and breakdown after resistance exercise in humans. (Phillips SM, Tipton KD, Aarsland A, Wolf SE, Wolfe RR.)
"Exercise resulted in significant increases above rest in muscle FSR at all times: 3 h = 112%, 24 h = 65%, 48 h = 34% (P < 0.01)."
But in;
The time course for elevated muscle protein synthesis following heavy resistance exercise. (MacDougall JD, Gibala MJ, Tarnopolsky MA, MacDonald JR, Interisano SA, Yarasheski KE.)
"It has been shown that muscle protein synthetic rate (MPS) is elevated in humans by 50% at 4 hrs following a bout of heavy resistance training, and by 109% at 24 hrs following training."
and
"It is concluded that following a bout of heavy resistance training, MPS increases rapidly, is more than double at 24 hrs, and thereafter declines rapidly so that at 36 hrs it has almost returned to baseline."
Anyone have any enlightening words that can help explain this situation?
My question is, are we confusing the high glycogen restoration rates postworkout with actual protein synthesis? Is there really any major muscle growth going on at this time?
Studies I have found are contradictory;
In;
Mixed muscle protein synthesis and breakdown after resistance exercise in humans. (Phillips SM, Tipton KD, Aarsland A, Wolf SE, Wolfe RR.)
"Exercise resulted in significant increases above rest in muscle FSR at all times: 3 h = 112%, 24 h = 65%, 48 h = 34% (P < 0.01)."
But in;
The time course for elevated muscle protein synthesis following heavy resistance exercise. (MacDougall JD, Gibala MJ, Tarnopolsky MA, MacDonald JR, Interisano SA, Yarasheski KE.)
"It has been shown that muscle protein synthetic rate (MPS) is elevated in humans by 50% at 4 hrs following a bout of heavy resistance training, and by 109% at 24 hrs following training."
and
"It is concluded that following a bout of heavy resistance training, MPS increases rapidly, is more than double at 24 hrs, and thereafter declines rapidly so that at 36 hrs it has almost returned to baseline."
Anyone have any enlightening words that can help explain this situation?