Protein Flashcards
The contribution of protein to oxidative metabolism in endurance exercise is normally approximately..
5%
Which of the following is true?
Glutamine is an essential amino acid.
Dietary protein intake and total energy intake are inversely related.
Insulin increases muscle protein synthesis and muscle protein breakdown.
None of the statements is true
None is true
There are stores of essential amino acids: you can store protein for later use. True/false
False
After a bout of resistance exercise without food intake there will be..
1) an increase in protein breakdown, no change in protein synthesis, and a net loss of protein
2) an increase in both muscle protein synthesis and breakdown, and a net loss of protein
3) an increase in protein synthesis, no change in protein breakdown, and a net gain of protein
4) an increase in both muscle protein synthesis and breakdown, and no net change in protein content
1)
- An acute bout of exercise depresses MPS during the exercise period, whereas MPS is elevated after exercise
True/false
True
- An acute bout of exercise leaves MPB unchanged, but it is elevated after exercise in both the fasted and fed state
True/false
True
- A net gain in muscle mass (MPS − MPB) after exercise is achieved only when amino acid availability is increased during the pre-exercise period
True/false
False: it should be increased in the post-exercise period
- AA availability is more important for inhibiting MPB than insulin – the secretion of which is stimulated most by glucose availability, without itself stimulating MPS
True/false
False: AA availability is less important. See scheme on p75
Research conclusions
1. Vast research supports .. individuals engaged in regular exercise training require more dietary protein than sedentary individuals.
2. Intakes of 1.4 – 2.0 g/kg/day .. is not only safe, but may improve the training adaptations to exercise training.
ok
Q: When the AV (artery vein) AA difference is measured across the leg, the measurements represent protein metabolism not only in skeletal muscle but also in bone, skin, and adipose tissue
true/false
True
Another way to measure protein metabolism is by..
Fractional rate: (FSR;FBR) in which you use stable isotopes
Advice: ■ early recovery phase (0–2 h after exercise). recommended protein intake of X body weight or Xg protein (~10 g essential amino acids) across the typical range of athlete body sizes
0.25– 0.3 g/kg
15–25 g
Why do athletes need more protein? (general recommendation)
- Recommendation based on normal PA adults in energy balance
- Preventing deficiency (N-balance) vs optimizing adaptation
- Nitrogen balance method not sufficient (you overestimate what people eat: they do not eat everything that is on their plate, extra losses of nitrogen have to be estimated and cannot be fully captured)
- Moving away from daily protein recommendations
- Athletes generally consume more protein (energy)
- No health issues with higher protein intake
Q: Which of the following is the most effective nutritional strategy to stimulate gain of net muscle tissue protein after exercise
A. 10 g of essential amino acids and 30 g of glucose
B. 10 g of leucine and 30 g of glucose
C. 50 g of nonessential amino acids
D. 20 g of nonessential amino acids and 30 g of glucose
E. 100 g of glucose
A
Protein quality scores: based on..
EAA composition & digestibility
