Elective abdominal surgery depresses muscle protein synthesis and increases subjective fatigue: Effects lasting more than 30 days

1990 ◽  
Vol 77 (7) ◽  
pp. 796-800 ◽  
Author(s):  
B. Petersson ◽  
J. Wernerman ◽  
S.-O. Waller ◽  
A. von der Decken ◽  
E. Vinnars
Keyword(s):  
Protein Synthesis ◽  
Abdominal Surgery ◽  
Muscle Protein ◽  
Muscle Protein Synthesis ◽  
Subjective Fatigue ◽  
Elective Abdominal Surgery

Protein ingestion increases muscle protein synthesis after, but not during, endurance exercise

2010 ◽  
Vol 44 (14) ◽  
pp. i6-i7 ◽  
Author(s):  
C. Hulston ◽  
E. Wolsk ◽  
T. Grondahl ◽  
C. Yfanti ◽  
G. van Hall
Keyword(s):  
Protein Synthesis ◽  
Endurance Exercise ◽  
Muscle Protein ◽  
Muscle Protein Synthesis ◽  
Protein Ingestion

scholarly journals Leucine or carbohydrate supplementation reduces AMPK and eEF2 phosphorylation and extends postprandial muscle protein synthesis in rats

2011 ◽  
Vol 301 (6) ◽  
pp. E1236-E1242 ◽  
Author(s):  
Gabriel J. Wilson ◽  
Donald K. Layman ◽  
Christopher J. Moulton ◽  
Layne E. Norton ◽  
Tracy G. Anthony ◽  
...  
Keyword(s):  
Protein Synthesis ◽  
Test Meal ◽  
Muscle Protein ◽  
Muscle Protein Synthesis ◽  
Adenosine Monophosphate ◽  
Energy Status ◽  
Sprague Dawley ◽  
Translation Elongation ◽  
Cellular Energy ◽  
Mtorc1 Signaling

Muscle protein synthesis (MPS) increases after consumption of a protein-containing meal but returns to baseline values within 3 h despite continued elevations of plasma amino acids and mammalian target of rapamycin (mTORC1) signaling. This study evaluated the potential for supplemental leucine (Leu), carbohydrates (CHO), or both to prolong elevated MPS after a meal. Male Sprague-Dawley rats (∼270 g) trained to consume three meals daily were food deprived for 12 h, and then blood and gastrocnemius muscle were collected 0, 90, or 180 min after a standard 4-g test meal (20% whey protein). At 135 min postmeal, rats were orally administered 2.63 g of CHO, 270 mg of Leu, both, or water (sham control). Following test meal consumption, MPS peaked at 90 min and then returned to basal ( time 0) rates at 180 min, although ribosomal protein S6 kinase and eIF4E-binding protein-1 phosphorylation remained elevated. In contrast, rats administered Leu and/or CHO supplements at 135 min postmeal maintained peak MPS through 180 min. MPS was inversely associated with the phosphorylation states of translation elongation factor 2, the “cellular energy sensor” adenosine monophosphate-activated protein kinase-α (AMPKα) and its substrate acetyl-CoA carboxylase, and increases in the ratio of AMP/ATP. We conclude that the incongruity between MPS and mTORC1 at 180 min reflects a block in translation elongation due to reduced cellular energy. Administering Leu or CHO supplements ∼2 h after a meal maintains cellular energy status and extends the postprandial duration of MPS.

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