How To Handle Running In A Heatwave


Pictured: Marathon des Sables in the Sahara desert

Without wishing to jinx it, the UK seems set to enjoy an absolute scorcher of a summer – or at least a week or two – which is no less than is deserved after the long, cold winter we endured. However, as anyone who ran the London Marathon this year will tell you, runners aren’t always delighted to see the sun with his hat on, because running becomes a great deal tougher when the mercury rises. And as with the competitors in this year’s London Marathon, sometimes there’s no choice but to pound the pavement in the heat – whether that’s to keep up your training for a future event or because you need the release only a run, even a super-sweaty one, can provide.

Fortunately there are several steps you can take to alleviate the problems that can arise when running through a heatwave. Here are some top tips for running in the heat we got from Andy Page, Pure Sports Medicine’s strength and conditioning coach, Jason Taylor, running coach with, and Merrell ambassador Dr Andrew Murray, who has won races in the Sahara and Gobi deserts.

Adjust Your Outfit

This doesn’t just mean sticking on a pair of sunnies (although that is a good idea). The temptation will be to wear as little clothing as possible, so a running vest is a good option, but remember to account for the risks of sunburn too and cover up if need be – especially when you’re going to be out for a long run.

“Light, synthetic fabrics that wick sweat away from the skin’s surface will help lower your body temperature even on the hottest of days,” says Page. “Avoid Lycra and compression garments because these can impair cooling.”

“It is very easy to dehydrate yourself by wearing layers that are too warm,” says Taylor. “Also, ensure your clothes don’t chafe – use Vaseline if required. I would recommend a lightweight running cap. As well as helping to shade your face, this will keep the worst of the heat away from your head.”

“I wear white or light-coloured loose-fitting clothing,” says Murray. “I will also wear sunscreen, and a Buff around my wrist to wipe excess sweat away.”

Hydrate, Hydrate, Hydrate

Remember you don’t just need water – you need electrolytes too.

“Electrolytes are lost through sweat in significant amounts and must be replaced,” says Taylor. “Replacing electrolytes is essential to keep your body hydrated, enhance performance and help prevent muscle cramps.”

Sports drinks like Lucozade Sport contain electrolytes and you can also use hydration tabs, which dissolve in water to create an electrolyte-rich drink. However, don’t just chug constantly during your exercise – there are risks to drinking too much water as well.

“Drinking too much water and diluting your blood can lead to hypoglycemia (low blood glucose) and hyponatremia (low sodium) and both are just as big a risk to your health and performance as dehydration,” says Page. “Steady consumption of food and water on hot days, including using sports drinks, is a better strategy than trying to take on large quantities of water in a short time.”

Steer Clear Of Cramp

“Cramping is often a by-product of poor hydration and diet in the first place, so careful control of these factors will be key,” says Page. “Stay hydrated, ideally with a sports drink for the sodium, or eat a light meal with water two hours before you train. These are the most effective strategies for staying clear of cramp.”

Look After Your Feet

“As the temperature increases, your feet will sweat more,” says Taylor. “Make sure your socks fit well and are in good condition. If need be, tape any hot spots or use blister protection such as Compeed.

“Always lace the running shoe from the bottom up so it is snug, but not so tight it feels like a tourniquet.”

Rest And Recover

You will probably want to jump straight in a freezing shower when you finish your run, but a tepid temperature is the smart choice.

“After stretching, take a lukewarm shower to cool your core temperature but be careful not to go too cold because the shock will stop the body from cooling and make you shiver, which will actually raise your body temperature,” says Page.