Concentration of leukocytes (A), neutrophils (B), lymphocytes (C), and monocytes (D) before (PRE) and after (POST) 14 days of optimal (OEA) (n = 11) or low energy availability (LEA) (n = 12), and after three days of refueling (REF) at rest (Rest) and following an acute exercise bout (EX). # denotes differences from rest to following acute exercise. $ denotes differences in changes (Δ) from rest to exercise within group. Significance code: $$ P < 0.01, ###P < 0.001.