The effects of amino acid supplementation on muscular performance during resistance training overreaching.

Abstract:

: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 x 8-12 repetitions maximum [RM], 8 exercises; phase 2: 5 x 3-5 RM, 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 1 RM 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.

journal_name

J Strength Cond Res

authors

Ratamess NA,Kraemer WJ,Volek JS,Rubin MR,Gómez AL,French DN,Sharman MJ,McGuigan MM,Scheett T,Häkkinen K,Newton RU,Dioguardi F

doi

10.1519/1533-4287(2003)017<0250:teoaas>2.0.co;2

keywords:

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

250-8

issue

2

eissn

1064-8011

issn

1533-4287

journal_volume

17

pub_type

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