With exactly one year to go until the Rio 2016 Olympics, Alistair and Jonny Brownlee have entered the GSK Human Performance Lab for a full day of assessments – including the dreaded heat tolerance test.

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Described as one of the most important tools that Team GB athletes have at their disposal over the next 12 months, the enviro chamber replicates temperature conditions up to 55°C and all the way down to -25°C, and can also control the amount of oxygen available to athletes – simulating air conditions close to the height of Everest (8,848m). 

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The tests enabled GSK scientists to gauge how the Brownlees respond to their environment when working hard, including measuring their individual sweat rate and electrolyte losses as well as the thermal impact by monitoring core body and skin temperature.