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Why Electrolytes Are Crucial for Energy, Muscles & Hydration in Sports

Many athletes drink enough – yet still lose performance. Find out why electrolytes play a crucial role and why water alone is often not enough in this article.

Electrolytes in Sports Explained Simply
Supporting Water & Energy Absorption
Drinking Recommendations
Connection: Muscles, Brain & Hydration
Muscle Work & Endurance Performance
Concentration & Performance
Electrolyte Deficiency
Why More Water is Needed When Sweating
Individual Sweat Loss
Electrolytes Instead of Water
Electrolytes According to Exercise Status
What to Look for in Electrolytes
Relevance of Composition
Choice of Carbohydrate Source
Galacatose with Electrolytes
Conclusion
Sources & References

Electrolytes in Sports Explained

When electrolytes are discussed, it's often only about "drinking enough." However, for sports, this is an oversimplification. A balanced fluid intake is crucial for athletic performance, as it supports the body's electrolyte balance, thereby maintaining stable central bodily functions.

What are electrolytes? Electrolytes are charged minerals like sodium, potassium, or magnesium, which are dissolved in liquids and thus help regulate electrical signals, fluid distribution, and transport processes in the body. They are essential for the balance between different minerals, which is indispensable for cell function, muscle contraction, nerve conduction, and overall fluid balance. This is precisely why they are not just a hydration topic, but an important factor for performance, concentration, and muscle work. In this article, we explain the significance of electrolytes in sports, why they do far more than just supply fluids, and how they connect energy, muscles, and hydration.¹'²'³

If you would like to learn more about electrolytes and trace elements, you can find all the important information on this topic in our basic article.

How do electrolytes support the absorption of water & energy?

The crucial point is their function. Glucose provides energy, water provides volume, but electrolytes create the conditions for both to reach where they are needed. Electrolytes regulate the body's water balance and fluid transport, which is particularly vital for muscle and nerve function during sports activities. In the small intestine, the absorption of sodium, glucose, and water is closely linked. Human studies show that sugar can increase sodium absorption in the jejunum and that hypotonic glucose-electrolyte solutions can improve water absorption.¹'²

For sports, this means: Pure water may be completely sufficient in many situations, but for longer, intense, or warm efforts, a well-formulated electrolyte-carbohydrate solution can be more functional because it better supports absorption processes.¹'²'¹²'¹³'¹⁴'¹⁵'¹⁶ The required amount of electrolytes depends on the individual exertion and sweat loss.

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For daily hydration during sports & active days, for example
Electrolyte complex of chloride, magnesium, potassium & sodium
Supplemented with the amino acids glycine & taurine
Pleasantly mild raspberry flavor
With galactose instead of household sugar or artificial sweeteners
No fillers or artificial flavors
Developed with doctors & experts

Drinking recommendation: How you can use electrolytes in sports

To ensure optimal hydration and performance, it is recommended to consume about 500-600 ml of water or an electrolyte drink approximately 2-3 hours before training. During longer training sessions, a small amount of electrolyte drinks should be consumed regularly to prevent dehydration. After training, it is important to promptly replenish lost fluids and electrolytes to support recovery.

Watch our video with Cosmo Bulasikis, expert in functional medicine & general practitioner, & learn why electrolytes are important.

"If you only drink water after training, you haven't optimised your recovery. The combination of water + electrolytes is crucial for post-exercise recovery."

Energy in the Body: How Muscles, Brain & Hydration are Connected

Performance is only good when energy, fluids, and electrical signal transmission work together. The most important electrolytes include sodium, potassium, calcium, magnesium, chloride, phosphorus, and bicarbonate – they play a central role in numerous bodily functions such as muscle contractions, nerve impulse transmission, and fluid balance regulation. High-quality electrolyte products should contain these seven minerals in a ratio similar to that of the human body. Calcium is crucial for bone stability and muscle contraction. Magnesium and potassium are essential for muscle function, energy metabolism, and muscle relaxation. Sodium and chloride, known together as table salt, regulate fluid transport into and out of cells and are important components of the acid-base balance.

How Electrolytes Affect Muscle Function and Endurance Performance

Several levels of evidence show that this chain is relevant in sports practice. Firstly, carbohydrate-electrolyte drinks improve endurance performance in various exercise models, especially in heat or with longer exercise duration.¹²'¹³'¹⁴'¹⁵ Isotonic drinks or electrolyte powders are particularly useful for endurance training or sessions over 90 minutes to maintain electrolyte balance and hydration. Isotonic electrolyte drinks typically contain sodium (400-800 mg/L), potassium (100-200 mg/L), and carbohydrates (4-8%), which improves water absorption in the intestine and stabilizes electrolyte balance. Continuously maintaining electrolyte and fluid balance during exercise is crucial to prevent performance decline and muscle cramps. Secondly, muscle studies show that intense work causes water and ion shifts in the muscle and that potassium dynamics in the muscle interstitium are related to fatigue.⁶'⁷ This is important because fatigue is not just a question of "lack of energy," but also depends on how well neuromuscular signals remain stable under load.⁶'⁷

Electrolytes in connection with concentration & mental performance

This is also relevant for the brain, as even slight dehydration can affect concentration, coordination, and reaction time – especially under stress. Even mild fluid deficits can be associated with impairments in mood, attention, or aspects of cognitive performance – in both men and women.⁹'¹⁰'¹¹ Especially in sports, where timing, body tension, and decision speed come together, this can become noticeable. The balance of electrolytes is crucial for nerve function and thus also for mental performance under stress. Electrolytes are therefore not only for "more water in the body," but for the quality of function under stress.⁹'¹⁰'¹¹

What are the symptoms of an electrolyte deficiency?

A deficiency in electrolytes such as magnesium or sodium can cause symptoms like muscle cramps, fatigue, or headaches. Electrolytes act like magnets for water, thus supporting hydration in the body. The acid-base balance and pH level are significantly influenced by electrolytes and are crucial for the balance and function of cells. Muscles need ATP as an immediate form of energy.

The brain requires a stable supply to prevent concentration, coordination, and exertion control from faltering prematurely. An imbalance, for instance due to heavy sweating, can significantly reduce performance and, in extreme cases, lead to muscle cramps, cardiac arrhythmias, or circulatory problems. Electrolytes themselves do not provide calories, but they enable central processes: sodium and potassium stabilize membrane potentials, magnesium is involved in many enzymatic steps of energy metabolism, and water only remains effectively in the system if the osmotic and electrochemical conditions are right.⁶'⁷'⁸'⁹'¹⁰'¹¹

Why you need more than just water when you sweat

Perhaps you know the feeling: Despite drinking enough water, you feel exhausted or unfocused after your workout. Sweat is more than just lost water. During exercise, sweating leads to significant fluid loss, which can disrupt the body's fluid and water balance. Primarily sodium and chloride are lost with sweat, and smaller amounts of potassium and magnesium. The extent of these losses depends on training status, heat exposure, sweat rate, and individual sweat composition.³'⁴'⁵

Why your individual sweat loss is crucial

What you lose is not the same for everyone. Sweat losses vary significantly from person to person, and heat acclimatization also changes the composition of sweat.³'⁴'⁵ Fluid loss during exercise, especially during endurance training, significantly affects electrolyte balance. Those who sweat heavily or tend to sweat "saltily" often have different requirements than someone with more moderate losses. For longer exertions, preparations such as powders, tablets, or capsules can help. The selection of suitable electrolyte drinks should be based on actual sweat loss, with sodium recommended as the main electrolyte to promote fluid retention.

Even a fluid loss of 2% of body weight can reduce performance by up to 15%. Electrolytes in sports are therefore not just a lifestyle add-on, but part of the physiological fine-tuning between fluid, exertion, and performance.³'⁴'⁵

Drink electrolytes instead of just water

This is precisely why two people often feel differently after the same session: One is simply thirsty, while the other also notices a drop in performance, a "spongy" feeling, or a decline in concentration.³'⁴'⁵'⁹'¹⁰'¹¹ For recreational athletes, water and a mineral-rich diet are usually sufficient for moderate exertion, while electrolyte drinks can be beneficial for longer or more intense sessions to balance electrolyte levels. The same applies to significant sweat loss in the sauna – especially when sauna sessions follow directly after exercise. In this combination, fluid and electrolyte losses accumulate further.

The problem with plain water is not that it is "bad." For short or low-intensity periods of exercise, it can be perfectly adequate. It becomes critical, however, when long periods of exertion coincide with high sweat loss. In such cases, water replaces volume but not lost electrolytes. Depending on the amount consumed, this can dilute the sodium concentration in the blood. Prospective marathon studies show that exercise-associated hyponatremia is not a theoretical fringe issue but occurs in practice – especially when too much free fluid is consumed and body weight even increases during the race.¹⁸'¹⁹

Why electrolytes must be individually tailored to the demands of exercise

Differentiation is crucial: sweat loss and cramps are not automatically the same. A study of distance runners found no clinically relevant differences in hydration status or acute serum electrolyte levels between runners with and without cramps.²⁰ This suggests that muscle cramps in sports are more complex than the simple formula "too little salt = cramp." Neuromuscular fatigue, exercise intensity, and individual susceptibility all play a role.²⁰ Electrolytes remain relevant – but the amount and intake of electrolyte supplements should be individually adjusted to avoid an imbalance in electrolyte levels, which can lead to muscle cramps, cardiac arrhythmias, or other physical disorders. For practical purposes, therefore, the decisive question is not whether you should drink "as much as possible," but whether your strategy fits the exertion. Those who sweat heavily, are out for a long time, or train in a warm environment usually benefit more from a targeted electrolyte strategy than someone who completes a relaxed, short session.³'⁴'⁵'¹⁶'¹⁷'¹⁸'¹⁹

What to look for in electrolytes

A good electrolyte concept doesn't start with marketing speak, but with function. What matters is which electrolytes are included, in what proportion they are, and whether the formulation also brings a suitable energy source if the exertion requires it. A balanced electrolyte equilibrium is of central importance for maintaining vital bodily functions such as muscle and nerve activity as well as fluid balance.¹⁶,¹⁷ Sodium is usually at the forefront in sports because it is particularly relevant for extracellular volume, fluid retention, and rehydration.¹⁶,¹⁷ Potassium is primarily important for the electrical stability of working cells.⁶,⁷ Magnesium plays a smaller role in sweat in terms of quantity, but can nevertheless be significant for energy metabolism and the stress response.⁸ The best electrolyte preparations should be individually tailored to specific needs. When taking electrolyte preparations, potential risks and issues such as overdose or interactions must be considered.

How many electrolytes do I need?

The amount of electrolytes should be individually adjusted to the fluid loss and exertion to avoid an imbalance. In isotonic drinks, maltodextrin is often used as a carbohydrate source to support energy intake during or after exercise. Even a little salt or potassium in drinks can help regulate electrolyte balance. Alcohol and caffeine can further increase fluid loss, so special attention should be paid to electrolyte intake when consuming them. The best products are tailored to individual needs. Nevertheless, it is important to know that improper intake of supplements can lead to an imbalance that carries health risks such as cardiac arrhythmias, muscle cramps, or fatigue.

Learn 7 tips on when and how to use electrolytes for maximum performance in our blog article.

Why the composition of your electrolyte drink is crucial

Equally important is the overall architecture of the drink. Electrolyte drinks are often offered as powders, which provide a practical and effective way to quickly absorb minerals. These powder products often contain not only electrolytes but also maltodextrin as a carbohydrate source to support energy supply during or after exercise. Human studies on intestinal absorption suggest that hypotonic or not overly concentrated glucose-electrolyte solutions can make water more available than unfavorably formulated mixtures.¹,² The added value then lies not only in "more energy" but also in the parallel support of fluid and substrate supply.¹'²'¹²'¹³'¹⁴'¹⁵'¹⁶ For everyday movement or short sessions, this advantage is significantly less pronounced. This does not lead to a rigid rule, but to a clear logic: the longer, hotter, and more sweat-inducing the exertion, the more important the quality of the electrolyte strategy becomes.¹²–¹⁹

Why the choice of carbohydrate source makes a difference

If an additional sugar source is used, it is worth taking a closer look at its metabolic profile. Not every form of fast sweetness feels the same under strain. Many electrolyte powders use maltodextrin as a rapidly available carbohydrate source to support energy supply during or after exercise. For very ambitious endurance activities, the main thing is that enough carbohydrates and fluids are tolerated overall. For many people in everyday training, however, it is also important how a drink feels: consistent, well-tolerated, without a quick high and without a noticeable energy crash. This is precisely where the choice of carbohydrate source becomes interesting.²¹–²⁵ In short: when it comes to electrolytes, pay less attention to catchy promises and more to composition, load context, and tolerability. A sensible product or nutrition concept in sports does not isolate electrolytes, but rather integrates them as part of a system of hydration, energy, and neuromuscular stability.¹–²⁵

Galactose with Electrolytes: Why the Combination Is So Interesting

Galactose is particularly interesting in sports because it behaves metabolically differently from glucose. In several studies, galactose before exercise led to flatter blood glucose and insulin curves than glucose.²¹,²⁵ This suggests a calmer glycemic response – not the fastest possible kick, but a more even supply. Especially for activities where you're not just looking for "immediate energy" but also a stable feeling over a longer period, this can be an exciting approach.²¹,²⁵ Furthermore, exogenously supplied galactose is oxidized more slowly during exercise than glucose.²²,²³ While this might initially sound like a disadvantage, it's more a question of application. Those seeking maximum immediate availability will find glucose provides substrate more quickly. Those who prefer a calmer metabolic response may see galactose as an interesting alternative – especially when it's not isolated but integrated into an overall concept with electrolytes and fluids.²¹–²³

Why galactose is particularly interesting due to its consistent energy release

Scientific sobriety is key: galactose is not automatically "better." Direct comparison studies show no consistent superiority in endurance performance over glucose.²¹,²⁴,²⁵ The added value therefore lies less in a universally faster finish time, and more in the type of energy supply: a flatter increase, a potentially more constant feeling, and a strategy that may be better suited to longer, steady efforts than to maximally explosive formats.²¹–²⁵ In the context of electrolytes, galactose is therefore not interesting as an isolated trend, but as a functional sugar source. If a sports product is intended to support fluid intake, electrolyte supply, and a more controlled carbohydrate response simultaneously, galactose can play a meaningful role. The real advantage then is not "more sweetness," but the ability to more finely tune energy supply and hydration physiologically.¹,²,²¹–²⁵

You can find out how to use electrolytes correctly here.

Conclusion

In sports, electrolytes are much more than just a hydration issue. They influence fluid balance, muscle function, and performance – especially during long, intense, or sweat-inducing activities. The key is not to consume as much as possible, but to have a strategy that suits the individual's exertion level.