The purpose of this study was to examine the effects of amino acid supplementation on muscular strength, power, and high-intensity endurance during short-term resistance training overreaching. Seventeen resistance-trained men were randomly assigned to either an amino acid (AA) or placebo (P) group and underwent 4 weeks of total-body resistance training consisting of two 2-week phases of overreaching (phase 1: 3 × 8-12 repetitions maximum [RM], 8 exercises; phase 2: 5 × 3-5RM, 5 exercises). Muscle strength, power, and high-intensity endurance were determined before (T1) and at the end of each training week (T2-T5). One repetition maximum squat and bench press decreased at T2 in P (5.2 and 3.4 kg, respectively) but not in AA, and significant increases in 1RM squat and bench press were observed at T3-T5 in both groups. A decrease in the ballistic bench press peak power was observed at T3 in P but not AA. The fatigue index during the 20-repetition jump squat assessment did not change in the P group at T3 and T5 (fatigue index = 18.6 and 18.3%, respectively) whereas a trend for reduction was observed in the AA group (p = 0.06) at T3 (12.8%) but not T5 (15.2%; p = 0.12). These results indicate that the initial impact of high-volume resistance training overreaching reduces muscle strength and power, and it appears that these reductions are attenuated with amino acid supplementation. In addition, an initial high-volume, moderate-intensity phase of overreaching followed by a higher intensity, moderate-volume phase appears to be very effective for enhancing muscle strength in resistance-trained men.
The effects of amino acid supplementation on muscular performance during resistance training overreaching / N.A. Ratamess, W.J. Kraemer, J.S. Volek, M.R. Rubin, A.L. Gómez, D.N. French, M.J. Sharman, M.M. Mcguigan, T. Scheett, K. Häkkinen, R.U. Newton, F. Dioguardi. - In: JOURNAL OF STRENGTH AND CONDITIONING RESEARCH. - ISSN 1064-8011. - 17:2(2003), pp. 250-258.
|Titolo:||The effects of amino acid supplementation on muscular performance during resistance training overreaching|
DIOGUARDI, FRANCESCO SAVERIO (Ultimo)
|Parole Chiave:||Fatigue; High-intensity endurance; Muscle strength; Power|
|Settore Scientifico Disciplinare:||Settore MED/09 - Medicina Interna|
|Data di pubblicazione:||2003|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1519/1533-4287(2003)017<0250:TEOAAS>2.0.CO;2|
|Appare nelle tipologie:||01 - Articolo su periodico|