By Monica N. for Stacked Fitness Hydration
SEPTEMBER 13, 2026 • 9 MIN READ
Key Takeaways
- A controlled trial found that athletes who drank a carbohydrate-electrolyte beverage before and during exercise took significantly longer to reach the point of muscle cramping than those who did not.
- Sodium is the electrolyte most consistently tied to exercise-associated muscle cramps, though potassium and magnesium losses through sweat can compound the problem on long or hot-weather training days.
- A peer-reviewed review found no controlled evidence that creatine supplementation increases muscle cramping or dehydration risk, despite a persistent gym myth to the contrary.
- Stacked Fitness Hydration's TONE pairs 5g of creatine with 980mg of electrolytes in a single daily stick, covering both sides of the cramp-prevention equation at once.
A calf or hamstring locking up mid workout usually traces back to one overlooked cause. How much sodium and other electrolytes you replaced before you started sweating matters more than most people realize.
What Actually Causes Exercise-Associated Muscle Cramps
Exercise-associated muscle cramps are the sudden, painful contractions that hit runners, cyclists, and lifters mid session. They have puzzled sports scientists for decades.
For years, the leading theory was purely neuromuscular. Fatigued muscles fire abnormal signals to the spinal cord, and the muscle locks up regardless of hydration status.
A newer body of evidence, summarized in a Gatorade Sports Science Institute review, suggests both mechanisms can be true at once. Fatigue lowers your cramp threshold, and an electrolyte shortfall lowers it further.
That combination explains a lot. Cramps show up more in the heat, late in a long race, or during a heavy training block when sweat losses pile up fast.
The Sodium Connection: What a Controlled Trial Found
The strongest piece of research on this topic is a controlled study. It measured how long it took participants to reach an induced cramping threshold under different drinking conditions.
Research summarized on PubMed found something striking. Participants who drank a carbohydrate-electrolyte beverage before and during exercise in the heat took meaningfully longer to reach their cramp threshold. Those drinking plain water or no fluid at all cramped sooner.
Time to onset, not just cramp severity, was the key measurement. The electrolyte group consistently outlasted the others.
This does not mean sodium is the only variable that matters. It does mean that, among interventions researchers can actually test, sodium alongside fluid delays cramping in a way water alone does not.
Sweat Losses Vary More Than Most People Realize
Blanket hydration advice keeps failing people for one big reason: sweat sodium concentration is highly individual, and the documented range is wide. Two people training side by side can lose very different amounts of sodium in the same hour.
Some athletes lose relatively little sodium per liter of sweat. So-called salty sweaters, the ones who see white residue on a dark shirt after training, lose several times more. The GSSI review notes this variability is a major reason cramp risk differs so much between two people doing an identical workout.
If you're a heavy or salty sweater, generic hydration products may undershoot what your body needs. That's especially true on a hot or high-volume training day.
Potassium and Magnesium: Rounding Out the Picture
Sodium gets most of the research attention. It is not the only electrolyte in play when a muscle cramps.
Potassium helps regulate the electrical signal that tells a muscle fiber to contract and relax. Low intracellular potassium has been proposed as a contributing factor in some cramp cases, particularly with prolonged sweating.
Magnesium plays a supporting role in neuromuscular signaling too. Low intake is common among active adults who don't eat enough leafy greens, nuts, or whole grains to cover training demands.
None of this means you need a dozen separate supplements. It means a hydration supplement built around more than one electrolyte, not sodium alone, better reflects what a sweating body actually loses.
Does Creatine Cause Cramps? Setting the Record Straight
The idea that creatine causes muscle cramps is one of the most repeated myths in strength training. It does not hold up well against the evidence.
A widely cited review in the British Journal of Sports Medicine is indexed on PubMed. It examined the existing controlled research on creatine, cramping, and dehydration, and found no consistent evidence linking supplementation to either outcome.
Several of the studies it reviewed found no statistically significant difference in cramp incidence between creatine and placebo groups.
The myth likely persists because creatine draws water into muscle cells, and people assume that shift must pull water from elsewhere in the body. The research doesn't support that leap. It's one more reason the best creatine strategy pairs the supplement with adequate fluid and electrolytes, rather than avoiding it out of caution.
Source: Stacked Fitness Hydration TONE product formulation.
Why Hydration, Electrolytes, and Creatine Work Best Together
Treating hydration, electrolytes, and creatine as three separate boxes to check misses how closely they interact inside a working muscle.
Creatine increases intracellular water content, part of why it supports strength and power output. That process runs more smoothly when total body fluid and sodium are already well managed.
Electrolytes in creatine formulas are not filler. They support the fluid balance that creatine's own mechanism depends on. That's the logic behind pairing the two, instead of taking plain creatine monohydrate and hoping your regular diet covers the rest.
It's a big part of why I recommend Stacked Fitness Hydration's TONE to clients who train hard and still cramp despite drinking plenty of water. It packs five grams of creatine and 980 milligrams of electrolytes into one daily stick. You're not juggling separate products or separate timing to cover both bases.
Practical Signs You Might Be Under-Replacing Electrolytes
Cramps are the most obvious signal. A few other patterns can point to the same underlying shortfall, and most of them show up well before a muscle actually locks up.
Pay attention to how your body responds across a full week of training, not just one hard session. A pattern that repeats is more telling than a single bad day in the heat.
- Cramping tends to hit late in a session or in the hours after, not in the first ten minutes
- You notice heavy, visible salt residue on clothing or skin after training
- Cramps cluster on hot, humid, or unusually long training days rather than every session
- Plain water before and during exercise doesn't seem to prevent the problem
If two or more of these sound familiar, the fix usually isn't more water. It's the right electrolytes in the water you're already drinking, dosed for how much you actually sweat.
Putting It Into Practice
The research on exercise-associated muscle cramps points to a few practical takeaways rather than one silver bullet.
Sodium, replaced before and during exercise, delays the onset of cramping in controlled research. Plain water alone does not do the same job. Potassium and magnesium play supporting roles too, especially on long or hot days when sweat losses climb.
Creatine, despite the long-running myth, has not been shown to raise cramp or dehydration risk in controlled studies. Its own performance benefits depend on the same fluid and electrolyte balance that prevents cramping in the first place.
That's the case for treating hydration and electrolytes as part of your creatine routine, not an afterthought. The approach can take different forms: a dedicated hydration supplement, a homemade electrolyte mix, or simply salting your food more deliberately around long sessions.
The goal stays the same either way. Give your muscles the sodium and electrolytes they're losing before the cramp forces the issue.
For more on this, see other electrolyte deficiency symptoms.
Further reading
- Miller KC, et al. Influence of Hydration and Electrolyte Supplementation on Incidence and Time to Onset of Exercise-Associated Muscle Cramps, PubMed
- Exercise-Associated Muscle Cramp, Gatorade Sports Science Institute
- American College of Sports Medicine Position Stand: Exercise and Fluid Replacement
- Dalbo VJ, et al. Putting to Rest the Myth of Creatine Supplementation Leading to Muscle Cramps and Dehydration, PubMed
