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Protein to Maximize Whole-Body Anabolism in Resistance-trained Females after Exercise.

Abstract：

INTRODUCTION:Current athlete-specific protein recommendations are based almost exclusively on research in males. PURPOSE:Using the minimally invasive indicator amino acid oxidation technique, we determined the daily protein intake that maximizes whole-body protein synthesis (PS) and net protein balance (NB) after exercise in strength-trained females. METHODS:Eight resistance-trained females (23 ± 3.5 yr, 67.0 ± 7.7 kg, 163.3 ± 3.7 cm, 24.4% ± 6.9% body fat; mean ± SD) completed a 2-d controlled diet during the luteal phase before performing an acute bout of whole-body resistance exercise. During recovery, participants consumed eight hourly meals providing a randomized test protein intake (0.2-2.9 g·kg·d) as crystalline amino acids modeled after egg protein, with constant phenylalanine (30.5 mg·kg·d) and excess tyrosine (40.0 mg·kg·d) intakes. Steady-state whole-body phenylalanine rate of appearance (Ra), oxidation (Ox; the reciprocal of PS), and NB (PS - Ra) were determined from oral [C] phenylalanine ingestion. Total protein oxidation was estimated from the urinary urea-creatinine ratio (U/Cr). RESULTS:A mixed model biphase linear regression revealed a break point (i.e., estimated average requirement) of 1.49 ± 0.44 g·kg·d (mean ± 95% confidence interval) in Ox (r = 0.64) and 1.53 ± 0.32 g·kg·d in NB (r = 0.65), indicating a saturation in whole-body anabolism. U/Cr increased linearly with protein intake (r = 0.56, P < 0.01). CONCLUSIONS:Findings from this investigation indicate that the safe protein intake (upper 95% confidence interval) to maximize anabolism and minimize protein oxidation for strength-trained females during the early ~8-h postexercise recovery period is at the upper end of the recommendations of the American College of Sports Medicine for athletes (i.e., 1.2-2.0 g·kg·d).

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Malowany JM,West DWD,Williamson E,Volterman KA,Abou Sawan S,Mazzulla M,Moore DR

doi

10.1249/MSS.0000000000001832

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

798-804

issue

4

eissn

0195-9131

issn

1530-0315

journal_volume

51

pub_type

杂志文章,随机对照试验

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