Effekt av födointag efter konditionsträning på reglering av proteinmetabolismen

[King Grub]

We previously reported an increase in skeletal muscle protein synthesis during fasted and fed recovery from non-exhaustive aerobic exercise (Harber, Konopka, Jemiolo, Trappe, Trappe, & Reidy, 2010). The current study examined skeletal muscle intracellular signaling in the same subjects to further investigate mechanisms of skeletal muscle protein metabolism with and without feeding following aerobic exercise. Eight males (VO2peak: 52±2 ml-1·kg-1·min-1) performed 60-min of cycle ergometry at 72±1% VO2peak on two occasions in a counter-balanced design. Exercise trials differed only in the post-exercise nutritional intervention: EX-FED (5kcal, 0.83g carbohydrate, 0.37g protein, 0.03g fat per kg body weight) and EX-FAST (non-caloric, isovolumic placebo) ingested immediately and one hour after exercise. Muscle biopsies were obtained from the vastus lateralis at rest (on a separate day) and two hours post-exercise to assess intracellular signaling via western blotting of p70S6K1, eEF2, 4EBP1, AMPKα and p38 MAPK. p70S6K1 phosphorylation was elevated (p < 0.05) in EX-FED relative to REST and EX-FAST. eEF2, 4EBP1, AMPKα and p38 MAPK signaling were unaltered at 2h after exercise independent of feeding status when expressed as the ratio of phosphorylated to total protein normalized to actin. These data demonstrate that feeding after a non-exhaustive bout of aerobic exercise stimulates skeletal muscle p70S6K1 intracellular signaling favorable for promoting protein synthesis which may, as recent literature has suggested, better prepare the muscle for subsequent exercise bouts. These data provide further support into the role of feeding on mechanisms regulating muscle protein metabolism during recovery from aerobic exercise.

Int J Sport Nutr Exerc Metab. 2013 Aug 26. The Effect of Feeding During Recovery From Aerobic Exercise on Skeletal Muscle Intracellular Signaling.

http://journals.humankinetics.com/ijsnem-in-press/ijsnem-in-press/the-effect-of-feeding-during-recovery-from-aerobic-exercise-on-skeletal-muscle-intracellular-signaling

[Knatcharn]

Kul, tack för den! :)

[Morty]

Stoppa pressarna, hehe.

[Knatcharn]

Stoppa pressarna, hehe.

Hehe jo men det är ändå kul med mer och mer belägg, så att säga.

[maqan]

Känns spontant ganska onödigt att göra den här typer av studier, men ju fler publikationer desto bättre i dagens tuffa forskningsklimat.

[tlk]

Känns spontant ganska onödigt att göra den här typer av studier, men ju fler publikationer desto bättre i dagens tuffa forskningsklimat.

Jag blir nyfiken på vad du anser är onödigt i det här. Förklara gärna.

[tjing]

Det här är dock intressant (om de syftar på studien med konditionsträning och styrketräning samma dag, där anabol signalering ökade efter konditionsträning tidigare under dagen).

"...These data demonstrate that feeding after a non-exhaustive bout of aerobic exercise stimulates skeletal muscle p70S6K1 intracellular signaling favorable for promoting protein synthesis which may, as recent literature has suggested, better prepare the muscle for subsequent exercise bouts."