a clear trendp = 0.054
In neither group did CD8+ T cell counts show a statistically significant correlation with epinephrine levels, although there was a clear trend in the control group (r = 0.51; p = 0.054) ( Figure 3 K). 2.6 IL-6 activity stimulates HPA axis activity during rest and exercise The HPA axis is the central neuroendocrine system, which when activated during exercise exhibits rapid kinetics similar to the catecholamine response [ 28 ].