The aims of this study were to compare the physiological responses from internal and external precooling methods during graded exercise tests in the heat.
In accordance with our first hypothesis, both precooling interventions resulted in greater predicted running speeds at fixed blood lactate of 2 and 3.5 mmol/L compared with no cooling. However, no difference in RE or increase in maximum oxygen uptake was observed.
Prior to exercise, internal precooling had the greatest effect lowering TCORE. Despite a failure to initially lower TCORE, external cooling demonstrated a meaningful mediation of the rise in TCORE during exercise. This different thermoregulatory response, suggests specific event characteristics will determine the choice of cooling.