Table 5

Univariate analysis of the relative abundance of urinary amino acids and derivatives: comparison between participants pre- and post-supplementation
Amino acid Pre-supplement relative abundance % mean (SEM) Post-supplement relative abundance % mean (SEM) P value
Alanine 5.80 (0.34) 5.09 (0.32) ns
Glycine 20.82 (1.08) 18.08 (1.58) ns
α-aminobutyric acid 0.20 (0.05) 0.21 (0.04) ns
Valine 1.00 (0.06) 1.24 (0.08) < 0.04
β-aminoisobutyric acid 3.11 (0.49) 4.48 (1.14) ns
Leucine 0.70 (0.04) 0.70 (0.04) ns
Isoleucine 0.17 (0.04) 0.35 (0.03) < 0.02
Threonine 2.45 (0.14) 2.35 (0.16) ns
Serine 5.94 (0.39) 5.42 (0.37) ns
Proline 0.31 (0.07) 0.51 (0.08) < 0.04
Asparagine 5.32 (0.35) 5.25 (0.52) ns
Aspartic acid 0.34 (0.08) 0.48 (0.06) ns
Methionine 0.29 (0.04) 0.35 (0.04) ns
Hydroxyproline 0.41 (0.07) 0.56 (0.08) ns
Glutamic acid 0.33 (0.07) 0.70 (0.09) < 0.008
Phenylalanine 1.07 (0.07) 1.20 (0.10) ns
α-aminoadipic acid 1.86 (0.33) 1.65 (0.29) ns
α-aminopimelic acid 0.15 (0.05) 0.10 (0.03) ns
Glutamine 12.61 (0.85) 8.75 (0.62) < 0.003
Ornithine 1.22 (0.11) 0.99 (0.10) < 0.04
Glycine-proline dipeptide 2.06 (0.22) 1.99 (0.22) ns
Lysine 6.53 (1.54) 6.36 (1.88) ns
Histidine 17.70 (1.12) 22.59 (2.71) ns
Hydroxylysine 1.29 (0.12) 1.44 (0.16) ns
Tyrosine 1.92 (0.13) 2.07 (0.16) ns
Proline-hydroxyproline dipeptide 3.04 (0.38) 2.84 (0.31) ns
Tryptophan 1.31 (0.10) 1.40 (0.11) ns
Cystathionine 0.86 (0.18) 1.37 (0.33) ns
Cystine 1.21 (0.12) 1.47 (0.20) ns
Total EAA 31.22 (1.38) 36.55 (2.79) < 0.05
Total BCAA 1.87 (0.13) 2.29 (0.11) < 0.02

Statistical test: Mann–Whitney U test, P < 0.05. Values are the mean (SEM) and are expressed as amino acid relative abundance (percentage). Analysis performed on arcsine transformed data. ns = statistically non-significant.

Dunstan et al.

Dunstan et al. Nutrition Journal 2013 12:115   doi:10.1186/1475-2891-12-115

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