Acute and Chronic physiological and perceptual responses to FSI occupational duties.
Increased IL-6 (33–45%) and reduced CRP (−10% to −40%) response to acute heat stress.
Chronic training exposure lowered neutrophils, leukocytes and monocytes in the FSI.
Increased physiological strain towards heat stress after chronic training exposure.
FSI may experience symptoms and health changes consistent with overtraining and changes to their health consistent conditions.