Improve your marathon time with proper pre-hydration

Andy Blow, sweat expert and founder of leading sports fuelling and hydration company Precision Fuel and Hydration, discusses how pre-hydration can help improve your marathon time.

Dehydration can seriously impact an athlete’s performance, and enjoyment of a marathon.

Yet according to the International Journal of Sport Nutrition and Exercise Metabolism, 31% of amateur athletes arrive at training sessions or events dehydrated.

For those looking to shave minutes off their race time – simply starting properly hydrated could be the answer.

We caught up with Andy Blow, CEO of Precision Fuel and Hydration, to find out how pre hydration can have such a dramatic effect on your marathon, and how runners can start a race in the best possible condition.

The benefits of pre-hydrating

Optimising your hydration status before a marathon, or ‘preloading’, can increase your blood volume and significantly improve your performance.

According to Sport Nutrition by Jeukendrup and Gleeson, dehydration of just 8% of each individual’s total-body water could half their exercise endurance, based on a 121 minute session.

Research has proven that taking onboard a high concentration of electrolytes, the salts and minerals that help your body function, promotes fluid retention which in turn increases the blood volume in your body.

This increased blood volume supports cardiovascular function helping transport oxygen and fuel to your muscles, and your body’s ability to dissipate heat produced by your working muscles.

This can reduce fatigue and improve endurance performance – helping you run your best marathon possible.

On the other hand, exercising in a dehydrated state can reduce blood volume, limit cardiovascular performance and limit the body’s ability to cool itself through sweat – all limiting the body’s ability to perform.

Pre-hydration is more than drinking water

Hydration is much more than just the amount of water we drink.

Your body is constantly aiming to maintain a balance between water and electrolytes.

It’s therefore important to take on correct levels of both to properly hydrate.

Drinking just water can upset that balance, diluting the body’s concentration of salt. Always wanting to maintain equilibrium, the body’s solution to this is to expel the excess water through urine. It’s basically going make you pee!

Unfortunately, this will also take with it some of the electrolytes in your system, further diluting your blood sodium levels and impacting your performance (and wellbeing in extreme cases).

However, consuming a strong electrolyte solution in the build up to a marathon will boost your salt levels, encouraging your body to retain the water you drink, helping you to start the race fully hydrated.

How to hydrate before a marathon

The timings of a race day, particularly an event as large as the London Marathon, can be vastly different to an athlete’s usual routine.

That’s why planning your hydration strategy is key.

Athletes preparing for a marathon should drink a strong electrolyte drink the night before the race to encourage your body to retain fluid, which will boost blood volume.

Aim for drinks containing >1,000mg of sodium per litre, like the PH 1500 tablets.

The morning of the race, 90 minutes before the start is recommended, athletes should drink another bottle of strong electrolyte drink to top-up blood plasma volume.

It is important to finish this drink 45 minutes before you set off to give the body time to process it.

While this plan will enable the average marathon participant to arrive at the start line hydrated, every person’s sweat concentration and sweat rate will be different, so athletes looking to maximise their potential should know their numbers, do a sweat test and form a more personalised hydration plan.

Dangers of over drinking

As much as beginning a marathon dehydrated can negatively impact your performance, there is also a danger that athletes can drink too much water in anticipation of a race – leading to a new set of problems.

Nervous drinking before a race is common for newcomers to marathon running, and those who haven’t planned their hydration.

Drinking too much water without taking on electrolytes can lead to hyponatremia.

Hyponatremia can be summarised as low blood sodium levels. This can be caused by inadequately replacing the sodium lost when sweating, compounded by drinking plain water or weak sports drinks mixed that further dilute sodium on the body.

Sodium is vital for several bodily functions like blood pressure and working nerves and muscles.

Hyponatremia can cause nausea or vomiting, fatigue, loss of energy, muscle weakness and cramps; all things you want to avoid when running a marathon.

According to National Kidney Foundation, when sodium levels are particularly low, more serious health implications can occur, even resulting in death.

Don’t waste your training

It’s probable that if you’re signed up to a spring marathon, you’ve done months of hard training.

By making sure you start the race properly hydrated, you not only reduce unnecessary discomfort, fatigue and muscle weakness, but will allow your body to realise its full potential come race day.

Training is also an ideal opportunity to test out your hydration strategy. Try running through your pre-race hydration and timings with the confidence that you are in the best possible shape.

For more on marathon fuel and hydration, visit https://www.precisionhydration.com/performance-advice/

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