Competing or training hard in summer heat is a physiological battle on two fronts simultaneously: maintaining performance output while managing a rising core temperature. Athletes who master both tend to go faster and recover better. Those who ignore the thermal side of the equation pay for it — through elevated heart rate at a given pace, compressed glycogen stores, compromised decision-making, and in extreme cases, heat illness.

The good news is that evidence-based cooling strategies can meaningfully reduce core temperature before sessions, slow its rise during them, and accelerate recovery afterwards. None of these require complex equipment — just intentional application.

Pre-Cooling: Lower the Starting Point

Pre-cooling is one of the most consistently supported interventions in the sports science literature for hot-weather performance. The principle is simple: the lower your core temperature at the start of exercise, the longer it takes to reach performance-limiting levels during it.

The most practical pre-cooling methods for endurance athletes include cold water immersion (15–20 minutes in water around 14–16°C), cold vests worn during warm-up, and internal cooling via consuming ice slurry or very cold fluids in the 20–30 minutes before the start. Internal (ice ingestion) and external cooling (vest or cold towels) together have been shown to outperform either in isolation. (Arngrimsson et al., 2004)

Pre-cooling doesn't just make you feel better at the start, it delays the point at which heat limits your output.

For racing contexts, cold vests are particularly practical, worn during the warm-up phase while keeping the core cool, they are removed on the start line with a measurable reduction in pre-exercise thermal strain. Research on marathon and triathlon athletes has shown pre-cooling interventions can extend the time to reach a critical core temperature by 4–8 minutes, a meaningful advantage at threshold effort.

Intra-Exercise Cooling: Manage the Rise

Once you're moving, the focus shifts to slowing the rate of core temperature increase. Cold fluid consumption remains one of the most effective in-race tools. Drinking cold rather than warm fluid during exercise is associated with reduced thermal sensation, lower perceived exertion at a given power output, and measurable differences in core temperature trajectory.

Ice slurry ingestion, partially frozen fluid consumed through a bottle,has attracted growing research interest and shows impressive results in hot conditions. Because melting ice within the body absorbs heat directly, the cooling effect per volume consumed is meaningfully greater than cold liquid alone. (Siegel et al., 2010)

When aid stations or feedzones are available, applying cold water externally to the neck, wrists, and head can reduce thermal perception even when core temperature changes are modest. The head and neck have a high density of thermoreceptors, meaning cooling these areas has an outsize effect on perceived effort relative to the actual physiological change.

Post-Exercise Cooling: Recovery as a Strategy

Cooling down quickly after training in the heat is not just comfort, it is part of the training stimulus. Prolonged heat stress post-exercise suppresses protein synthesis, prolongs the stress response, and can compromise sleep quality, which is where the most productive adaptation happens.

Cold water immersion post-training remains the fastest way to reduce core temperature. Even a 10-minute cold shower is meaningfully better than air cooling alone. If you're racing across consecutive days, prioritising rapid post-exercise cooling gives you a better physiological starting point for the next day's effort.

Hydration as a Cooling Tool

Cooling strategy and hydration strategy are inseparable in the heat. Dehydration reduces plasma volume, which forces the cardiovascular system to work harder to deliver blood to both working muscles and the skin for cooling. Maintaining fluid balance,  particularly with the electrolytes needed to retain that fluid, directly supports your body's ability to thermoregulate.

  • SLT07 Hydration Tablets: Use chilled or ice-cold water to double up — both the electrolytes and the cold fluid contribute to your thermal management strategy.

  • MIX90 Dual-Carb Drink Mix: Prepared cold and consumed regularly through long sessions, it keeps both fuel and hydration in balance while contributing to thermal sensation management.

Heat management is coachable. The athletes who treat it with the same rigour they apply to pacing, fuelling, or training load consistently outperform those who simply try to push through. Build your cooling protocol now, and hot race days become a competitive advantage rather than a threat.