Fig. 2
Summary of pathway analyses based on metabolomics data. a Heatmap clearly shows the relationship in potential biomarkers between before- and after-marathon serum samples. The Euclidean distance matrix for the quantitative value of the differential metabolites, and cluster the differential metabolites with the complete linkage method. The abscissa represents different experimental groups, the ordinate represents the comparison of the metabolites among different groups, and the color blocks at different positions represent the relative expression of the corresponding metabolites. b Bubble plot displays the increasing impact of the enrichment analysis of metabolic pathways, with key bubbles reflecting that the metabolic pathways were significantly altered by marathon