Do endurance athletes actually lose more minerals?
Yes, and through three routes at once, which is why the losses compound faster than most athletes expect.
Sweat
Minerals leave the body dissolved in sweat. More training hours and more heat mean more loss, and the palms and soles are among the most active excretory surfaces you have.
Stress
Sustained training is a physiological stressor. Prolonged stress depletes mineral reserves, and the body does not distinguish between the useful kind and the harmful kind.
Turnover
Minerals run the reactions that produce energy. Higher output means faster consumption, so an intake that is fine for a sedentary adult can fall short for you.
Each of these alone is manageable. Together, in someone training seriously through a long build, they are the reason a diet that looks adequate on paper stops being adequate in practice.
Why am I still cramping if I take electrolytes?
Because cramping is usually a ratio problem, not a quantity problem, and most electrolyte products are built to solve quantity.
Muscle contraction and relaxation depend on balance between minerals, not on the absolute amount of any single one. Calcium drives contraction; magnesium permits relaxation. Potassium and sodium govern the voltage across the cell membrane that makes the signal fire at all. What matters is the relationship.
Calcium can sit inside its normal range in both rows. It is the relationship that changed, and a sodium-heavy sports drink can widen it further.
This is why adding more of one electrolyte sometimes makes cramping worse instead of better. If magnesium is depleted and you load sodium, you have not corrected the imbalance. You have deepened it.
The OligoScan reports the calcium-to-magnesium and potassium-to-sodium ratios directly, alongside the individual levels. That is the number worth looking at when cramping persists through everything that should have fixed it.
Why has my recovery slowed down?
Recovery is construction work. Repairing muscle, restoring glycogen and clearing metabolic byproducts are all enzyme-driven processes, and the enzymes that run them require mineral cofactors. When the cofactors run short, the work still happens, just slower.
The pattern athletes describe is consistent: sessions that used to need one easy day now need two, sleep stops feeling restorative, and heart rate sits higher than the effort justifies. Training load has not changed. The capacity to absorb it has.
You cannot build with materials you do not have. More rest helps. It does not replace what is missing.
Worth ruling out first: iron status, thyroid function, and genuine overtraining, all of which produce a similar picture and need standard medical evaluation. Mineral testing is a useful addition to that workup, not a replacement for it.
Can heavy metals actually affect athletic performance?
Yes, through a mechanism that is easy to miss: heavy metals compete with essential minerals for the same absorption and transport pathways. A meaningful heavy-metal burden can leave you functionally deficient even when your intake is genuinely good. The mineral is there, but something else is occupying the seat.
Aluminium deserves specific mention for athletes. Elevated aluminium can interfere with lymphatic function and with the ability to sweat freely. For an endurance athlete that is a double cost: sweating is how you cool, and it is also one of the routes heavy metals leave by. If you struggle to break a sweat in conditions where you should be pouring, that is worth investigating rather than pushing through.
Where do athletes pick up heavy metals?
Some exposure routes are common to everyone. Several are specific to how athletes live and train.
| Source | Heavy metals involved | Why it applies to athletes |
|---|---|---|
| Chocolate & cacao products | Cadmium, lead | Among the highest dietary sources. Heavily represented in energy bars, recovery drinks and gels. |
| Plastic bottles | Antimony | Athletes drink a great deal more than most people, often from bottles left in hot cars or sun. |
| Municipal tap water | Fluoride, aluminium | Higher fluid intake means higher cumulative exposure from the same water. |
| Chlorinated pools | Chlorine, halides | Relevant for swimmers and triathletes. Halides compete with iodine. |
| Tattoos | Cadmium, lead, mercury, nickel, arsenic | Common in endurance and obstacle-race communities. |
| Antiperspirants | Aluminium | Blocking perspiration interferes with a route heavy metals use to leave. |
| Traffic & industrial air | Mixed | Hours of hard breathing beside roads means far greater inhaled volume than a sedentary person gets. |
None of these is cause for alarm on its own. Together they explain why two athletes with similar diets can have quite different heavy-metal burdens, and why a scan starts with questions before it starts with light.
When should you test around race season?
Timing changes what the result is worth. Test when there is still runway to act on it.
Red = test. Deep detox and chelation belong in the off-season, never during a build.
For repeat scans, use the same hand and similar conditions each time. Comparing a post-race scan to a rested off-season scan tells you about the race, not about progress.
She's not a nutritionist who read about endurance sport.
Dawn Westrum began studying nutrition in 2004, the same year she ran her first marathon on a dare, with three days' notice. That turned into hundreds of marathons, ultramarathons and 100-mile races, plus adventure races, Spartan obstacle races, Ironman triathlons and paragliding competition.
In the 2015 Red Bull X-Alps she finished as the top female, covering roughly 300 miles on foot and 500 by paraglider across twelve days. She wrote about it in Racing to the Sky.
That matters here for a practical reason. She has been on the other side of every conversation on this page: the cramp that wouldn't quit, the recovery that stopped working, the plateau with no obvious cause. When she asks what your training week actually looks like, she knows what the answer means.
What testing won't fix
Minerals are one input among many. Being honest about the boundary is part of the value.
- It won't replace training. No mineral corrects a build that was too much, too fast, or too little sleep.
- It isn't a diagnosis. Persistent fatigue, poor recovery and cramping have medical causes that need a physician: iron deficiency, thyroid dysfunction, cardiac issues, genuine overtraining. Test for those too.
- It doesn't measure everything. The OligoScan reads the intracellular and interstitial compartments. It won't tell you your ferritin, your VO2max, or what's happening in a specific organ.
- One scan is a snapshot. The value is in the trend across a season, not in a single reading.
- Supplementing without testing can make things worse. Adding a mineral to a ratio that's already skewed is how people end up further from balance than when they started.