Isotonic drink: Advice about the energy drink


Do you know about isotonic drinks? When you're exercising, it's essential to take in fluids in order to maintain your performance level. But after an hour of exercise, water is not enough! Your muscles need an energy boost from an intake of carbohydrates and sodium, to compensate for sweating. These two essential elements are exactly what isotonic drinks supply the body with during sporting activity!

What is an isotonic drink?

An isotonic drink contains similar concentrations of water, carbohydrates and sodium to blood, making assimilation of its constituent parts easier at the intestinal level. They are therefore better for digestion. In addition, an isotonic drink helps to maintain body hydration and makes water absorption easier during sporting activity.

The difference between hypertonic and hypotonic drinks

Hypertonic drink

A hypertonic drink means that it has a greater concentration of constituents than blood. A drink that is over concentrated will slow down digestion speed and therefore limit rehydration. This can then cause cramps or heartburn.

Hypotonic drink

Conversely, a hypotonic drink means that it has a lower concentration of constituents than blood. A very diluted drink will stimulate rehydration at the expense of nutrient absorption!

The optimum composition of an  energy drink depends on the environmental conditions and the conditions in which you are exercising. When exercising in very warm conditions, hydration is of the utmost importance for health and safety. We advise that you have a more diluted drink available (hypotonic). In cooler weather, when dehydration is not such a problem, a more concentrated drink should be suitable (isotonic).

Preparing your isotonic drink

Powder, syrup or pre-mixed drink: here is a short video with advice on preparing the right isotonic drink for you.

Home-made isotonic drink recipes?

  • too much fructose can have a laxative effect during exercise,
  • too much salt can cause dehydration,
  • too much glucose can cause hypoglycaemia.

These examples show that isotonic drink quantities must be very precise and should only be changed with caution.

This is why the Aptonia isotonic drinks are ideal: they have been designed to respond to sports people's needs and to ease dosing.

How should you use an isotonic drink?

Isotonic drinks are designed for all sports.

Whatever your type of exercise, it is recommended to hydrate regularly, without waiting to feel thirsty. As with thirst, don't wait until you feel tired before giving your muscles an energy boost!

Have 1 or 2 sips of Iso every 10 or 15 minutes so that your sensations are the same throughout your activity.

Composition of the Aptonia ISO drink

Why add vitamins to an isotonic drink?

Vitamins B1, B2 and B6 are water-soluble. They are not stored by the body and must be provided by everyday food intake. They play a role in the metabolism and assimilation of nutrients for the formation of energy.

What's the role of sodium?

The supply of sodium in drinks is beneficial because: 

  • It makes up for sodium lost in sweat: in fact, sweat is a mixture of water and minerals, particularly sodium.
  • It enables better intestinal assimilation of water and carbohydrates. This water absorption enables rehydration.
  • It stimulates the thirst mechanism,
  • It enables better retention of liquid intake.

What is a carbohydrate mix?

The latest scientific research shows that rehydration drinks combining carbohydrate and fructose in a 2/1 ratio (2 molecules of carbohydrates to 1 molecule of fructose) enable better hydration and a quicker release of energy to the muscles than drinks that only contain carbohydrates.

Marie Fauchille
Dietician | Nutritionist
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Your body needs water. For happy and healthy body, you need to compensate for water loss. Before, after and especially during physical exertion, dehydration is any athlete's worst enemy, affecting both the body and sporting performance. That's why staying properly hydrated is essential for all of us. This is why the Aptonia blog is going to publish its first report on the benefits and signs of good hydration for athletes. Firstly, here are 6 tips for staying efficiently hydrated before, during and after exercise.