Carbohydrate gel selection in endurance goes far beyond just energy content. Environmental factors such as temperature, humidity, and altitude directly influence absorption, hydration, and gastrointestinal tolerance. Adjusting nutritional strategies according to the environment can be decisive for maintaining performance.
Temperature and heat stress
In hot environments, the body prioritizes cooling through increased blood flow to the skin and sweating. This reduces blood flow to the gastrointestinal tract, which can impair nutrient absorption and increase the risk of discomfort.
In this scenario, gel selection should consider:
Lower carbohydrate concentration per serving
Presence of sodium to support electrolyte replacement
Consumption alongside water to prevent increased osmolality
Highly concentrated gels, especially when not accompanied by adequate fluid intake, may delay gastric emptying and worsen tolerance.
Humidity and sweat rate
Humid environments impair sweat evaporation, further increasing heat stress. This elevates electrolyte loss and the risk of dehydration.
In practice:
Gels containing sodium become even more relevant
The strategy should prioritize consistent hydration
It may be necessary to reduce carbohydrate concentration per intake
In this context, combining gels with an electrolyte replacement strategy can be highly effective.
Cold environments
In cold conditions, thirst perception is often reduced, which may lead to insufficient fluid intake. Despite this, energy demands remain high.
For these situations:
More concentrated gels may be better tolerated
Carbohydrate intake can be maintained or even increased
Care should be taken not to neglect hydration
Additionally, gel viscosity may increase at very low temperatures, impacting palatability and ease of consumption.
Altitude
At altitude, important physiological changes occur, such as increased carbohydrate utilization and a potential reduction in appetite. There may also be a higher risk of gastrointestinal discomfort.
Recommended strategies:
Prioritize easily absorbable carbohydrates
Distribute intake throughout the exercise
Test tolerance in similar conditions beforehand
Here, gel selection should focus on energy efficiency with minimal gastrointestinal strain.
Practical application
Gel selection should always take into account the environment of the training session or competition. Some practical guidelines include:
Hot and humid conditions: prioritize gels with sodium and lower concentration, always with water
Cold conditions: greater flexibility for more concentrated gels
Altitude: focus on tolerance and intake distribution
Testing these strategies during training is essential to avoid surprises on race day.
The environment has a direct impact on physiological responses to exercise and, consequently, on sports nutrition. Adjusting gel selection based on temperature, humidity, and altitude helps optimize absorption, reduce discomfort, and sustain performance throughout the effort.
Ignoring these variables can compromise even well-planned nutritional strategies.
