Abstract
Summary Since exercise stress is associated with multiple changes in immune parameters, we evaluated the effect of acute exercise on 3 indices of immune function in the horse. Six unconditioned thoroughbred horses were subjected to a tread- mill-based exercise challenge. Exerci se intensity was determined by monitoring each horse's heart rate, plasma lactate, and cortisol levels. Concurrently, peripheral blood mono- nuclear cells were used to assess pokeweed mitogen (PWM) -induced blastogenesis, influenza-specific proliferation, and lymphokine activated killer (LAK) cell activity. Heart rate peaked during the gallop on an incline while lactate was highest at the end of the stress test (To) with values of 200 bpm and 9 mM/L respectively. Average plasma cortisol was great- est at TO and T+2o with values 76% higher than unstressed horses. Significantly (P
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