Figure 1.

CPMG proton 1D NMR spectra of young horse plasma samples before exercise (A) and after exercise (B). The main metabolites are labeled in the spectra and metabolites appearing in both spectra are not repeated. The main metabolites are labeled as follows: 1–9, metabolites from lipid metabolism; 1, β-hydroxybutyrate; 2, glycerol; 3, choline; 4, phosphocholine; 5, alkene; 6, methyl; 7, methylene; 8, methylene-α-ester; 9, methylene-β-ester; 10–14, metabolites from carbohydrate metabolism; 10, lactate; 11, fumarate; 12, citrate; 13, acetate; 14, glucose; 15–24, metabolites from amino acid metabolism and glycoproteins; 15, creatine; 16, creatinine; 17, urea; 18, phenylalanine; 19, tyrosine; 20, glutamate; 21, 2-3-methylvalerate; 22, N-Acetyl; 23, alanine; 24, branched chain amino acids (valine, leucine, isoleucine).