Electrolytes are key elements in health and nutrition. Through this article, we will try to explain the nature and role of different electrolytes in hydration.
Once these concepts are understood, we can then address the problem of hyponatremia, which is a consequence of inadequate compensation for sodium loss and can have disastrous consequences.
What is an electrolyte?
The scientific definition of an electrolyte is: a chemical element that carries an electrical charge once dissolved. In the case of hydration, electrolytes ingested via various foods or drinks are dissolved in blood plasma.
Various electrolytes useful in hydration are found, mainly the following minerals: magnesium, sodium (salt), potassium, chloride, calcium, and phosphorus.
What is the role of electrolytes in the body?
Electrolytes help to promote hydration and physical performance.
The main roles of electrolytes can be simplified as follows:
Magnesium is essential for the proper functioning of the body, playing a key role in energy metabolism, muscle function, bone health, and blood pressure regulation. It also contributes to protein synthesis, protection against oxidative stress, and the maintenance of electrolyte balance.
Sodium is one of the most important electrolytes for the body, playing a primary role in regulating water balance and the distribution of fluids between the intra- and extracellular compartments. It is also a major determinant of plasma osmolarity, thus contributing to blood pressure regulation and cellular hydration. Although it indirectly participates in acid-base balance, its main role in a sports context is to maintain electrolyte balance and promote rehydration after exercise, which aids in muscle recovery.
Potassium, on the other hand, is a player in muscle contraction, so intake during sport helps to replenish reserves and increase endurance.
Calcium participates in the mineralization of bone tissue and neuromuscular excitability: this means it promotes muscle contraction.
Chloride, in collaboration with sodium, is essential for maintaining body fluid balance and plasma osmolarity. It also participates in acid-base balance, thus supporting hydration and proper cellular function.
Phosphorus is involved in the body's energy production reactions and in the cellular respiratory chain: it is therefore a player in physical endurance.
What are the benefits of electrolytes?
Electrolytes are important for maintaining fluid balance in the body. They enable optimal regulation of water distribution between the intra- and extracellular compartments, thus supporting cellular hydration. This function is particularly important for ensuring the proper functioning of all organ systems and preventing dehydration. By regulating plasma osmolarity, electrolytes play a key role in managing fluid volumes, which helps maintain stable blood pressure and a consistent water balance.
Electrolytes also contribute to the body's acid-base balance, buffering pH fluctuations and preventing excessive acidification, especially after intense physical exertion. This is particularly relevant for athletes because overly acidic blood can affect performance and recovery. By regulating acidity, electrolytes help optimize physiological conditions for muscle contraction and the management of metabolic waste, such as lactic acid, produced during exercise.
Finally, electrolytes are indispensable for the body's thermal regulation. By managing body water, they help maintain internal temperature within an optimal range, by facilitating perspiration to dissipate heat or by contributing to the thermal stability of organs. This ability to manage temperature allows the body to function efficiently even under thermal stress or during prolonged efforts.
The risks of electrolyte deficiency
Electrolytes are important for many physiological processes, and their deficiency can lead to serious health effects, ranging from reduced athletic performance to major cardiovascular risks. Certain electrolytes, particularly sodium, potassium, and magnesium, are crucial for regulating and retaining water in the body. Their absence therefore promotes dehydration, which can worsen the situation.
A moderate electrolyte deficiency can go unnoticed and be neglected, but it can also degrade general health and complicate the healing of certain conditions such as gastroenteritis, for example, by promoting dangerous dehydration. In cases of significant deficiency, symptoms can worsen rapidly, leading to potentially serious complications. Finally, although all electrolytes are essential, some deficiencies, such as sodium deficiency (hyponatremia), can pose more immediate and severe health risks.
Hyponatremia and its risks
Hyponatremia is defined by a sodium level below 135 mmol/L in the blood and is confirmed by a blood ionogram. This condition can have various causes, including dehydration, which leads to sodium loss through sweat, but also excess water. Indeed, excessive water consumption, especially if it is devoid of sodium, can lead to dilution of sodium in the blood. This increase in diluted blood volume triggers a physiological response aimed at restoring balance with water moving from the blood to the cells. In extreme cases, this excess water can cause cells to swell, a potentially fatal situation, much more serious than dehydration, which can lead to a water coma.
The first symptoms of hyponatremia affect the brain, causing lethargy, mental confusion, and other brain dysfunctions. This can be followed by a water coma.
In severe forms, convulsions, violent muscle contractions, and coma can occur. It is therefore essential to understand that excessive consumption of plain water, especially during intense physical exercise, can have dramatic consequences. This phenomenon is observed in marathon runners, where advice to drink regularly to avoid dehydration can paradoxically lead to hyponatremia due to overhydration. A study conducted during the 2002 Boston Marathon revealed that at the end of the race, 13% of participants had hyponatremia linked to excessive water consumption.
The risks of hyponatremia due to excess water are particularly common in sports contexts, but can also manifest during periods of extreme heat. So, how can one maintain good hydration while avoiding the risk of hyponatremia?
Maintaining a good electrolyte balance
Maintaining a good electrolyte balance is essential to stay hydrated, prevent hyponatremia, and enjoy the benefits of electrolytes. This is particularly important during physical exertion, periods of intense heat, or in cases of vomiting or diarrheal episodes, which can lead to dehydration. In these situations, it is recommended to opt for hypotonic drinks, rich in electrolytes, to effectively compensate for losses. These drinks help maintain fluid and electrolyte balance, thus promoting recovery and performance.
Hydratis tablets offer a practical and suitable solution for these specific needs. Their composition, concentrated in electrolytes, trace elements, and sugar, helps prevent imbalances while promoting optimal hydration, whether during prolonged exertion or during periods of high heat.
Outside of these risk periods, it remains important to support electrolyte balance daily. A varied and balanced diet forms an excellent basis for this. For example, calcium is found in dairy products, lentils, and almonds; magnesium is present in nuts, chocolate, and green leafy vegetables; potassium is found in foods such as bananas, artichokes, and spinach; as for sodium, it is mainly found in salty foods. A diversified diet rich in these nutrients not only maintains electrolyte balance but also supports many other essential physiological functions.
Conclusion
Electrolytes play a central role in regulating fluid balance, plasma osmolarity, and proper muscle and nerve function. Their contribution to thermal homeostasis, acid-base balance, and cardiovascular health illustrates their importance for maintaining essential biological functions. Sodium, in particular, is crucial for preventing imbalances like hyponatremia, while potassium, magnesium, and calcium support endurance and recovery after exertion.
To maintain an optimal electrolyte balance, it is essential to combine a varied diet rich in minerals with adapted isotonic solutions, especially during physical exertion, hot weather, or illnesses leading to dehydration.
Bibliography
-Mohammadifard, N., Gotay, C., Humphries, K., Ignaszewski, A., Esmaillzadeh, A., & Sarrafzadegan, N. (2019). Electrolyte minerals intake and cardiovascular health. Critical Reviews in Food Science and Nutrition, 59, 2375 - 2385. https://doi.org/10.1080/10408398.2018.1453474.
