Spoiler alert: Gulping plain water might be stalling your athletic performance.
We have all been told to "drink more water" to stay healthy and perform at our best. Yet, millions of people drink litres of plain water every day and still suffer from sluggishness, muscle cramps, and brain fog. Why?
Because hydration isn’t about how much fluid you have; it’s about electrical balance.
To truly unlock the benefits of electrolytes and achieve optimal hydration, we have to look past the water bottle and understand the vital role of electrolytes.
What are electrolytes, exactly?
At their core, electrolytes are essential minerals—such as sodium, potassium, calcium, magnesium, and phosphorus—that carry a tiny electric charge when dissolved in bodily fluids.
Think of your body as a highly complex electrical machine. Your brain cannot tell your heart to beat, your muscles cannot contract, and your cells cannot absorb nutrients without these electrical charges.
Electrolytes act as conductors that allow these vital messages to travel through your nervous system, helping maintain fluid balance.
While a balanced diet covers everyday needs, your body constantly loses these minerals through intense training, high heat, humidity, or illness and must be replenished through diet and electrolyte supplementation as needed. When your levels drop, you begin to experience the classic signs of electrolyte imbalance, and the entire system stalls.
Why Southeast Asia’s climate demands electrolytes
In SEA’s tropical heat, sweat doesn't work the way it’s supposed to. Because the air is already saturated with moisture, your sweat can't evaporate; it simply drips off your skin,
leaving you hot and wet. Deprived of its primary cooling mechanism, your body goes into overdrive, pumping out even more sweat in a desperate bid to lower its temperature. This leads to a rapid, heavy drain of both water and essential minerals.
A study evaluating recreational tropical runners in Singapore and similar climates found that even adapted, native tropical runners lose significant fluid and sodium during standard training sessions.
- Average Sweat Rate: Males averaged a sweat rate of 1.3 L/h, while females averaged 0.9 L/h.
-Sodium Loss: Sweat sodium loss averaged 1,242 mg/h for males and 897 mg/h for females.
If you are exercising in Singapore's intense humidity, replacing lost fluid volume is only half the battle. To train safely and perform at your best, you must match your fluid intake with electrolyte replacement.
The ultimate misconception: Why plain water isn't enough!
Many believe that chugging plain water is the fastest way to rehydrate. But without electrolytes, water can simply pass straight through your system without being properly absorbed by your cells!
This was clearly demonstrated in a study tracking soldiers during a long-distance march in Singapore’s humid climate. Even though the participants drank plain water whenever they wanted, their blood sodium levels progressively dropped. Without salt replacement, the sheer volume of water diluted their systems, pushing several soldiers into clinical hyponatraemia. This condition causes everything from headaches and muscle cramps to confusion, and in severe cases, dangerous brain swelling or seizures.
Electrolytes act as cellular magnets, pulling water into the bloodstream and tissues where it is needed most. When you pair fluids with the right minerals, electrolyte hydration ensures that fluids are absorbed faster, muscles function optimally, and your body's thermoregulation in athletes and active individuals improves dramatically.
Why standard sports drinks fall short
If plain water fails, the common impulse is to grab a neon-coloured sports drink from the nearest convenience store. Unfortunately, they usually aren't built for tropical realities either.
Many commercial sports drinks only contain a small amount of sodium (approximately 230–575 mg of sodium per litre of sweat) to maintain taste. However, to truly offset the losses of exercising in Singapore's heat, oral rehydration solutions (which contain higher sodium concentrations of 30–60 mmol/L) are significantly more effective at promoting fluid retention and maintaining performance.
What happens when you dehydrate?
When the body becomes dehydrated, your plasma volume drops, your heart rate rises, and your body heats up. In this state, your body enters survival mode, where it actively diverts its limited resources toward maintaining your core temperature and circulation, leaving very little capacity to actually help you build strength or stamina.
If you keep training in a dehydrated state, your workouts become harder to sustain and the overall quality of your sessions decreases. Over time, this cumulative fatigue can cause your performance to plateau or even temporarily decline.
Signs of dehydration
Dehydration is a sliding scale. Because the early indicators can be incredibly subtle, it is vital to recognise how your body signals fluid and mineral loss before your performance plummets.
|
Dehydration severity |
What you feel (Symptoms) |
What is happening physically (Signs) |
|
Mild dehydration (1–3% body weight loss) |
Thirst, dry mouth, and a slight wave of tiredness or sluggishness. |
Blood pressure remains stable, but you will experience a mild elevation in heart rate and slightly dry mucous membranes. |
|
Moderate dehydration (4–6% body weight loss) |
Dizziness, muscle cramping, and noticeable irritability or loss of focus. |
A drop in blood pressure upon standing, a distinctly accelerated heart rate, and slower capillary refill. |
|
Severe dehydration (≥7% body weight loss) |
Confusion, extreme fatigue, drowsiness, and minimal to no urine output. |
Dangerously low blood pressure, rapid heartbeat, altered awareness, and cool, clammy skin signalling potential shock. |
PRO TIP: If you train or race often in hot weather, don't just guess how much to drink when training. Instead, weigh yourself before and after a workout, or get a sweat test. This gives you the exact data you need to plan how much to drink each day.
Keeping your body in balance
For anyone with an active lifestyle—an everyday trainee or an elite athlete—properly replacing electrolytes is the secret to long-term progress and sports performance.
Research from the American College of Sports Medicine (ACSM) shows that losing just 1% to 2% of your body weight in fluids can slash your aerobic performance by up to 15%.
Even this mild level of dehydration can trigger a cascading effect on the body:
- Decreased aerobic capacity: Your cardiovascular system has to work significantly harder.
- Increased perceived exertion: Workouts feel noticeably tougher at intensities you can usually handle.
- Elevated risks: A higher likelihood of muscle cramps, early fatigue, and delayed muscle recovery.
The 3 benefits of staying hydrated during workouts
By keeping your fluid and mineral levels perfectly balanced, you directly support three core pillars of athletic health:
- Cognitive Clarity: You maintain quick reaction times, clear thinking, and the ability to make smart decisions during a tough workout (like knowing exactly when to appropriately push the pace in a race).
- Endurance and Adaptation: You can hold your pace longer, fight off workout fatigue, and help your body actually adapt and grow stronger from your training.
- Heat control: You keep your internal temperature safe and stable, even when exercising in hot and humid weather.
When and how to replenish electrolytes
Because proper hydration requires planning and intent, relying on thirst alone means you are already playing catch-up. During extended or intense sessions, sweat loss leads to a rapid drain of fluid and sodium.
To optimise your hydration, sports nutrition guidelines recommend utilising an electrolyte blend that delivers 400–1100 mg of sodium per litre, paired with 150–300 mg of potassium and 5–20 mg of magnesium. This is especially critical for high-intensity training, or any activity lasting over 60 to 90 minutes in hot environments.
To get the most out of your training, structure your hydration strategy around your session:
|
Timing |
Hydration protocol |
Target goal |
|
Pre-Workout Hydration |
Drink 500 ml of water mixed with electrolytes 1–2 hours prior to exercise. |
Pre-load your system to ensure optimal plasma volume before you start sweating. |
|
During-Workout Hydration |
Consume 150–250 ml of electrolyte water every 15–20 minutes during your session. |
Maintain a steady stream of fluids and minerals to prevent a mid-workout crash. |
|
Post-Workout Recovery |
Rehydrate with 1.5 L of fluid for every 1 kg of body weight lost. |
Fully restore fluid balance and kickstart the cellular recovery process. |
The Realm advantage
True hydration requires an intentional strategy. With Realm electrolytes, you can perform better, recover faster, and protect your health—no matter how high the temperature or intensity climbs. Power your Realm of possibilities with our science-backed hydration salts, fuel with intention, and perform with purpose.
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References:
- National Academies of Sciences, Engineering, and Medicine. (Year). Dietary reference intakes for sodium and potassium. National Academies Press.
- Surapongchai J, Saengsirisuwan V, Rollo I, Randell RK, Nithitsuttibuta K, Sainiyom P, Leow CHW, Lee JKW. Hydration Status, Fluid Intake, Sweat Rate, and Sweat Sodium Concentration in Recreational Tropical Native Runners. Nutrients. 2021 Apr 20;13(4):1374. doi: 10.3390/nu13041374. PMID: 33923890; PMCID: PMC8072971.
- Poon BH, Prakaash S, Teo YS, Fan PW, Wei Lee JK. Thermal strain and fluid balance during a 72-km military route march in a field setting. Singapore Med J. 2022 Sep;63(9):497-502. doi: 10.11622/smedj.2021053. Epub 2021 Apr 19. PMID: 34005849; PMCID: PMC9678143.
- Fan PW, Burns SF, Lee JKW. Efficacy of Ingesting an Oral Rehydration Solution after Exercise on Fluid Balance and Endurance Performance. Nutrients. 2020 Dec 15;12(12):3826. doi: 10.3390/nu12123826. Erratum in: Nutrients. 2021 Oct 28;13(11):3855. doi: 10.3390/nu13113855. PMID: 33333771; PMCID: PMC7765193.
- Sawka, M. N., Burke, L. M., Eichner, E. R., Maughan, R. J., Montain, S. J., & Stachenfeld, N. S. (2007). American College of Sports Medicine position stand: Exercise and fluid replacement. Medicine & Science in Sports & Exercise, 39(2), 377–390. https://doi.org/10.1249/mss.0b013e31802ca597
- Kavouras, S. A. (2014). Hydration, dehydration, and exercise performance. Journal of the American College of Nutrition, 31(2), 71–78. https://doi.org/(add DOI)
- Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Nutrition and athletic performance. Medicine & Science in Sports & Exercise, 48(3), 543–568. https://doi.org/10.1249/MSS.0000000000000852
- Sawka, M. N., Burke, L. M., Eichner, E. R., Maughan, R. J., Montain, S. J., & Stachenfeld, N. S. (2007). American College of Sports Medicine position stand: Exercise and fluid replacement. Medicine & Science in Sports & Exercise, 39(2), 377–390. https://doi.org/10.1249/mss.0b013e31802ca597
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Photos by Unsplash.
