Table 2.
Results from Paired t Tests Testing Differences in Plasma Concentrations of Amino Acids and Biogenic Amines Between Age, Sex, and Height-Matched Cases (low muscle quality) and Controls (high muscle quality)
| Metabolite | Difference (case–control) | p value |
|---|---|---|
| Alanine | 22.55 | .284 |
| Arginine | −0.65 | .856 |
| Asparagine | 19.65 | .248 |
| Citrulline | 10.05 | .364 |
| Glutamine | 20.09 | .354 |
| Glutamate | −4.47 | .645 |
| Glycine | −2.68 | .844 |
| Histidine | 2.04 | .359 |
| Isoleucine | 5.76 | .012# |
| Leucine | 10.09 | .033# |
| Lysine | 0.74 | .926 |
| Methionine | 1.43 | .067# |
| Ornithine | −0.22 | .962 |
| Phenylalanine | 2.55 | .137 |
| Proline | −10.75 | .129 |
| Serine | 4.04 | .326 |
| Threonine | 10.69 | .189 |
| Tryptophan | 3.78 | .045 |
| Tryosine | 3.75 | .148 |
| Valine | 2.43 | .725 |
| Asymmetric dimethylarginine | 0.02 | .338 |
| Symmetric dimethylarginine | 0.02 | .405 |
| Total dimethylarginine | −0.01 | .832 |
| Creatinine | 69.04 | .311 |
| Kynurenine | −0.06 | .642 |
| Putrescine | −0.025 | .018 |
| Serotonin | 0.07 | .078 |
| Spermidine | 0.012 | .298 |
| Taurine | 4.35 | .268 |
Note: # p values after log transformation.