Why Are Electrolytes Important for Exercise?
When most people think about staying hydrated during a workout, water is usually the first thing that comes to mind. And it should be, as water intake is the foundation of hydration.
However, as workouts become longer, harder, or take place in hotter conditions, many athletes begin to notice that water alone doesn’t feel enough. Energy fades sooner than expected, muscles feel heavy, holding a steady pace becomes more difficult. In this article, we'll focus on why electrolytes play such an important role during exercise as training demands increase. If you’re interested in a broader overview of how electrolytes support hydration across daily life and exercise, our complete guide brings everything together.
What Your Body Loses During Exercise
Exercise generates heat, and the body relies on sweat to cool itself down. Sweat is mostly water, but it also contains electrolytes, primarily sodium, along with smaller amounts of potassium and magnesium (Baker, 2017).
Electrolytes help your body keep the water you drink and send it where it’s needed, such as to your bloodstream and working muscles.
During moderate to high-intensity exercise, sweat losses typically range from about 0.5 to 2.0 liters per hour. The exact amount depends on workout intensity, environmental temperature, and individual physiology (Barnes et al., 2019). Along with this fluid loss, sodium is lost in meaningful amounts. Many athletes lose several hundred milligrams of sodium per hour, and losses can be even higher during longer sessions or in warmer conditions (Baker et al., 2022).
As sodium and other electrolytes continue to be lost, hydration becomes less effective unless those electrolytes are replaced alongside fluid.
Why Sodium Is the Key Electrolyte for Exercise Hydration
Sodium plays a central role in hydration during exercise. It helps maintain blood volume, supports nerve signaling, and allows muscles to contract normally. In simple terms, sodium helps water stay in your system long enough to do its job.
If sodium levels drop too low during prolonged or very intense exercise, you can start to have fatigue, dizziness, poor coordination, or difficulty sustaining effort, even when fluid intake appears adequate.
Because of this, many sports nutrition organizations recommend sodium replacement during prolonged exercise. Position statements from the American College of Sports Medicine and the International Society of Sports Nutrition indicate that sodium supplementation of 300 milligrams per hour is effective for maintaining hydration and supporting performance during moderate to high-intensity exercise lasting longer than 60 minutes (Thomas et al., 2016; Kerksick et al., 2018).
More recent reviews focused on endurance and ultra-endurance athletes suggest that 300 milligrams of sodium per hour is a practical starting point, with adjustments made based on individual sweat rates, environmental conditions, and personal response (Veniamakis et al., 2022).
Considering Baseline Sodium Intake from Food
Exercise hydration, however, does not exist in isolation from diet. Most athletes already consume significant amounts of sodium through food. In fact, average sodium intake in the United States exceeds general dietary recommendations (U.S. Department of Agriculture & U.S. Department of Health and Human Services, 2020).
For this reason, effective exercise hydration isn’t about adding excessive sodium on top of an already high baseline. Instead, it’s about replacing the sodium lost through sweat while accounting for what’s already being consumed as part of a normal diet.
Balance matters.
How IMPAC+ Performance Fits Into This Concept
IMPAC+ Performance was developed to support this balanced approach to exercise hydration. It is designed specifically for moderate to high-intensity activity, delivering a functional sodium dose that aligns with current evidence-based recommendations without relying on excessive sodium levels or high-sugar formulations.
At the core of Performance is a sodium target of approximately 300 milligrams per hour as an initial benchmark. This level supports fluid retention, muscle function, and sustained effort during longer or more demanding workouts, while recognizing that athletes already consume sodium through their daily diet.
This reflects how hydration actually works during exercise. Replace what’s lost. Maintain balance. Adjust based on conditions and individual response.
The Bottom Line
Electrolytes aren’t meant to make hydration extreme. They’re meant to make hydration effective when exercise places real demands on the body. Products like IMPAC+ Performance are built around this principle, helping athletes hydrate with intention rather than trial and error.
References
Baker, L. B. (2017). Sweating rate and sweat sodium concentration in athletes. Sports Medicine, 47(Suppl 1), 111–128.
Baker, L. B., et al. (2022). Explaining variation in sweat sodium concentration. Journal of Applied Physiology, 133(6), 1250–1259.
Barnes, K. A., et al. (2019). Normative data for sweat sodium loss. Journal of Sports Sciences, 37(20), 2356–2366.
Hurley, S. W., & Johnson, A. K. (2015). The biopsychology of salt hunger and sodium deficiency. Pflügers Archiv: European Journal of Physiology, 467(3), 445–456.
Kerksick, C. M., et al. (2018). ISSN exercise & sports nutrition review update. Journal of the International Society of Sports Nutrition, 15(1), 38.
Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Nutrition and athletic performance. Journal of the Academy of Nutrition and Dietetics, 116(3), 501–528.
U.S. Department of Agriculture & U.S. Department of Health and Human Services. (2020). Dietary Guidelines for Americans, 2020–2025.
Veniamakis, E., Kaplanis, G., Voulgaris, P., & Nikolaidis, P. T. (2022). Effects of sodium intake on health and performance in endurance and ultra-endurance sports. International Journal of Environmental Research and Public Health, 19(6), 3651.