TENEL LABS
Built by Tennis Physiologists, Proven on Court.
- Tennis athletes lose up to 2g of sodium and 1.5 L of fluid in a three‑set match.**¹
- Generic sports drinks undersupply sodium, contain sugar that spikes and crashes blood glucose, and slow fluid uptake.
- TENEL™ solves these pain points with 900 Mg Sodium, 250 Mg Potassium, 65 Mg Magnesium, and 60 Mg Calcium per stick—zero added sugars, low‑osmolality (< 170 mOsm·kg⁻¹).
- Internal testing shows ‑34 % fewer unforced errors and +47 % faster repeated‑sprint speed vs. placebo (p < 0.05).
Why is Tennis Hydration Different?
- Tennis combines explosive 5‑ to 20‑second rallies with 60–120 minutes of stop‑start plays.
Research shows tennis players sweat an average of 1.4 liters per hour, with sodium concentrations around 1,200 mg per liter—nearly 50% higher than runners or cyclists at 800 mg per liter (Lott & Galloway, 2011). - When you don't replace sodium at that rate, plasma volume drops, nerve signals to muscles become inconsistent, and performance degrades—showing up as fatigue and unforced errors.²
The problem with sugar-heavy drinks? Their high osmolality (above 300 mOsm·kg⁻¹) slows gastric emptying, meaning they sit in your stomach longer and delay absorption when rapid rehydration matters most.³
Why Does it Matter?
Citrate Buffer & Low Osmolality
Sodium citrate works as a buffering agent, neutralizing the hydrogen ions your muscles produce during intense rallies and maintaining blood pH above 7.3—the threshold where performance starts to degrade.
Meanwhile, TENEL's low osmolality (below 170 mOsm·kg⁻¹) accelerates gastric emptying by 20–45% compared to sugar-laden drinks at just 6% (Shi et al., 1998).³
The result: your body absorbs what it needs faster, and your muscles maintain power output even when lactate accumulation would normally force you to slow down.
Research Snapshot
Sweat‑Loss Diagnostic (n = 18)
We measured total sweat loss during a simulated 2-set match under moderate heat stress (26°C, 60% relative humidity).
Players lost an average of 1,230 mg of sodium per liter of sweat—with 22% classified as "salty sweaters" exceeding 1,500 mg·L⁻¹.
Double‑Blind Performance Trial (n = 20)
Study Design: Randomized crossover trial comparing TENEL against an identically flavored placebo with zero electrolytes.
Protocol: Players completed 6 rounds of 20-meter shuttle sprints (every 15 minutes) across 90 minutes of match-simulation drills designed to replicate competitive intensity.
Results:
- Unforced errors decreased by 34% (p = 0.04) with TENEL vs. placebo
- Perceived exertion dropped by 1.3 units on the Borg RPE scale (6–20)
- Plasma sodium levels remained stable at 140 ± 2 mmol·L⁻¹ with TENEL, compared to 136 ± 3 mmol·L⁻¹ with placebo
- Gastric emptying was 22% faster at 30 minutes compared to a 6% carbohydrate control solution
The Bottom Line
Players using TENEL made fewer mistakes, felt less fatigued, maintained optimal blood sodium levels, and absorbed fluids faster than those using either a placebo or traditional carbohydrate-based sports drinks.
TENEL isn't based on generic sports science—it's formulated from tennis-specific physiology.
Every ingredient, every ratio, every design choice exists because the research supports it and because tennis performance demands it.
References
1. Lott, T., & Galloway, S. (2011). Fluid balance and sodium losses during indoor tennis match play. Int J Sport Nutr Exerc Metab, 21(6), 451‑457.
2. International Olympic Committee. (2023). Consensus statement on hydration and electrolyte management in sport. Br J Sports Med, 57(4), 221‑234.
3. Shi, X., Summers, R. W., & Gisolfi, C. V. (1998). Effect of beverage osmolality on intestinal fluid absorption during exercise. J Appl Physiol, 85(5), 1945‑1950.
4. Rehrer, N. J., & Irving, P. M. (2001). Intestinal fluid absorption during exercise: role of beverage osmolality and sodium. Clin Nutr, 20(1), 51‑55.
5. Berger, R. J., et al. (2019). Calcium dynamics and exercise‑induced muscle cramps. Sports Med, 49(12), 1947‑1960.
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