תזונה ותוספים Acute and long-term effects of resistance exercise with or without protein ingestion

[Mike Bikov]

Acute and long-term effects of resistance exercise with or without protein ingestion on muscle hypertrophy and gene expression.

Hulmi JJ, Kovanen V, Selänne H, Kraemer WJ, Häkkinen K, Mero AA.

Department of Biology of Physical Activity, University of Jyväskylä, P.O. Box 35, 40014 Jyväskylä, Finland. [email protected]

The effects of timed ingestion of high-quality protein before and after resistance exercise are not well known. In this study, young men were randomized to protein (n = 11), placebo (n = 10) and control (n = 10) groups. Muscle cross-sectional area by MRI and muscle forces were analyzed before and after 21 weeks of either heavy resistance training (RT) or control period. Muscle biopsies were taken before, and 1 and 48 h after 5 x 10 repetition leg press exercise (RE) as well as 21 weeks after RT. Protein (15 g of whey both before and after exercise) or non-energetic placebo were provided to subjects in the context of both single RE bout (acute responses) as well as each RE workout twice a week throughout the 21-week-RT. Protein intake increased (P < or = 0.05) RT-induced muscle cross-sectional area enlargement and cell-cycle kinase cdk2 mRNA expression in the vastus lateralis muscle suggesting higher proliferating cell activation response with protein supplementation. Moreover, protein intake seemed to prevent 1 h post-RE decrease in myostatin and myogenin mRNA expression but did not affect activin receptor IIb, p21, FLRG, MAFbx or MyoD expression. In conclusion, protein intake close to resistance exercise workout may alter mRNA expression in a manner advantageous for muscle hypertrophy.
PMID: 18661258 [PubMed - indexed for MEDLINE]

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:bad:

 

[אבי כהן]

תודה.
נדמה לי שזה כבר המחקר השני שאני רואה שתומך בחלבון לפני ואחרי.
אבל,
לא מופיע פה (בתקציר) אינ' ביחס לצריכת החלבון של קב' הביקורת והפלסבו (לך תדע מתי צרכו אם בכלל...)
וגם לא מצוין כאן מתי בדיוק החלבון נצרך (מעבר ל "לפני" ו"אחרי")

 

[Mike Bikov]

רוצה את המלא?

 

[אבי כהן]

תביא, בכיף : )
מה שמזכיר לי שתכננתי לעבור על המחקר ההוא עם האנגלית הבלתי אפשרית