Fig. 1
From: Beetroot juice — a suitable post-marathon metabolic recovery supplement?
Multi-level principal component analysis plot of the pre-marathon [P0] serum metabolite profiles of the beetroot group relative to the (a) 24 h post-marathon [P1] and (b) 48 h post-marathon metabolite profiles [P2], profiles of the same group. Abbreviations: PC: principal component. The ellipsoids represent 90% confidence intervals of each centroid