Leukocyte responses to antigens (e.g. lymphocyte proliferation, neutrophil degranulation, NK cytotoxic activity) Salivary IgA Neutrophil/Lymphocyte Ratio T-cell CD4+/CD8+ Ratio T-cell CD4+CD45RO+ expression Plasma cortisol or cortisol/testosterone ratio Urinary steroids or catecholamines Plasma glutamine Plasma urea Plasma cytokines (e.g. IL-6) Blood lactate response to incremental or high intensity exercise Plasma or salivary cortisol response to high intensity exercise |