An underestimated performance factor
In sports nutrition, the debate is still too often dominated by carbohydrates.
However, for the majority of endurance athletes, the real limiting factor is not a lack of sugar, but a water and electrolyte imbalance—and in particular, a sodium deficit.
Sodium is not a detail.
It is a central element of muscular, nervous, and cardiovascular function, especially when exercise is prolonged and the temperature rises.
Salt, sodium: what are we really talking about?
Table salt is sodium chloride (NaCl), composed of:
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60% chlorine
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40% sodium
1 g of sodium corresponds to approximately 2.5 g of salt.
This distinction is important because some labels indicate sodium, others salt.
In sports, it is indeed sodium that interests us, because it is what conditions hydration, nerve conduction, and muscle contraction.
What is the purpose of sodium during exercise?
Sodium plays several essential roles:
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it enables better water absorption
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it helps maintain blood volume (plasma volume)
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it participates in the transmission of nerve signals
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it limits the drop in blood sodium concentration (hyponatremia)
Drinking only water during prolonged exercise is often insufficient.
Without sodium, water is less well retained, less effectively utilized, and can even dilute blood electrolytes.
Result: premature fatigue, drop in performance, digestive issues, cramps, or even withdrawal.
Sodium and heat: a critical issue
When the temperature rises, sodium losses increase sharply.
An athlete can lose:
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1 to 2 liters of sweat per hour
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800 to more than 2000 mg of sodium per liter, depending on the individual
In these conditions:
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drinking only water accentuates the dilution of sodium
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sugar gels provide no electrolytic solution
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performance often drops even before energy runs out
In a hot environment, sodium often becomes the number one limiting factor, well before calories.
How much sodium during exercise?
There is no universal value.
Requirements vary according to:
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the duration of the exercise
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intensity
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temperature
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sweat profile
However, current data suggest that an intake of approximately
400 to 600 mg of sodium per hour
is relevant for long-duration efforts, particularly in hot conditions.
The goal is not to overcompensate, but to limit fluid and electrolyte drift.
After exercise: a key lever for recovery
Sodium also plays a major role after exercise.
Early sodium intake allows for:
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faster rehydration
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better restoration of the hydro-mineral balance
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more effective recovery
This is particularly important when efforts are close together (ultra-distance, training camps, multi-day competitions).
The BSE approach: energy + sodium, without excess
At Brutal Salty Energy, we have designed our products around a simple reality:
endurance performance relies on
stable energy + real hydration + functional sodium
Our products integrate:
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consistent energy sources (lipids, low sugar)
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an assertive sodium intake
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excellent digestive tolerance
They are designed to:
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last
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function in the heat
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avoid peaks and crashes
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support real, not theoretical, efforts
What salt do we use at BSE?
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Purees and snacks: Guérande salt
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Electrolyte drinks: fine salt, chosen for its solubility and dosage precision
The choice of salt is not marketing.
It is functional, adapted to the use and the product.
In summary
In endurance, especially over long durations and in high heat:
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sodium conditions water usage
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hydration often precedes the question of calories
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too much sugar without electrolytes creates more problems than solutions
Less automation.
More coherence.
More sodium when it's needed.
That is endurance that lasts.