Heat Acclimation

Preparing for an event in the heat, such as the Marathon de Sables? Performance in the heat can be significantly impaired, through the impact of an increase in body temperature as well as an elevated risk of dehydration.

heat chamber

So if you are doing an event in the heat, it is wise to do all you can to prepare.   We have a chamber in which the temperature and humidity can be increased to help you adapt.  Regular exercise in hot, humid conditions causes several physiological adaptations that can reduce the adverse effects of heat on exercise performance.

What is involved?

Whilst a one-off session in the heat chamber would give you an idea of how you respond, a series of sessions would be much more useful as it will allow you to acclimate to the heat, as well as trialling kit, and potentially also different nutrition/hydration strategies. 

We aim for at least an hour of exercise in the chamber, with the target of getting your temperature up to around 38.5C for the greatest duration possible.  During the session we will take regular measurements of your heart rate, perception of effort, perception of heat stress and tympanic (ear) temperature.  We will also get measures of your body mass pre and post session, and how much you drank, in order to calculate your sweat rate.

We can also measure sweat sodium concentration.  This helps us track your adaptation, but can also be useful in guiding your hydration stategy, particularly if you are classed as a very salty sweater.

Exercise can take place on a treadmill or bike.


The number of heat acclimation sessions you may need to book with us to prepare for your event depends on many factors, such as whether you’ve been acclimated before, whether you’re male or female, and what heat acclimation resources you have access to outside the lab. 

Ideally, you should do your heat acclimation as close to your departure as possible so you will be ready for your event. However, we understand that your availability and daily schedule plays a part in when you can come in for your sessions, and it is also possible to complete an acclimation block a few weeks or even months before an event, and then 'top up' with a small number of sessions prior to departure.

Our ideal scenario for you to achieve maximal adaptations is to complete 6 sessions in the chamber and to supplement this with passive heat exposures. Our general advice is the more sessions you can complete the better. This may not be possible/necessary for everyone, so we are happy to discuss your individual situation and needs, and come up with an appropriate plan.

Who is it for?

Anyone who is preparing for an event in the heat can access our service. There is also evidence emerging that the physiological adaptations to exercising in the heat can provide benefits when exercising at altitude, as well as when exercising in temperate conditions.  Exercise mode and intensity is adapted to suit the individual’s requirements. 

What do you get?

After each session you will receive a report with your data.  This explains how you responded during the session,  tracks adaptations over time and advises on how much you need to drink to rehydrate post-session. 

After your final session, you will receive a more comprehensive report which will include an analysis of how you have adapted to the heat,  information on your sweat rate and how much you need to drink to maintain hydration, as well as your sweat sodium concentration and how this influences your hydration strategy.  

Throughout the course of sessions we will also be able to help you determine an optimal, appropriate pacing strategy for your event.  You will gain an understanding of how you feel in the heat and how this relates to your physiology, so that you can keep your hydration on track and adapt exercise intensity as necessary to help you avoid overheating.

Cost of sessions

Cost for an individual are:

1 – 3 sessions £100/session

4 – 6 sessions £85/session

7+ sessions £80/session.

Discounts are available for bookings for more than one person.