Exercise-Associated Muscle Cramps : Recovery Modalities and the Evidence

Less clearly than the popular story suggests. The 2019 review of six decades of research found the hydration and electrolyte explanation incomplete, and the 2022 evidence-based review concludes cramps come from a confluence of intrinsic and extrinsic factors rather than a single cause, explicitly cautioning against generalized advice like simply drinking more. Salt and fluid may matter for some athletes; they do not explain everyone.

It is the recommended immediate response and it is what most athletes do, but the controlled evidence is weaker than the anecdotes. The 2022 evidence-based review recommends gentle static stretching until symptoms abate. The 2019 review notes recent controlled studies found no significant difference between stretching and not stretching. Gentle is the operative word: forcing a stretch into a fully contracted muscle risks a strain.

There is no trial evidence that intravenous fluids prevent or treat exercise-associated cramps in a healthy athlete, and the underlying dehydration premise is itself contested in the reviews cited here. IV therapy is a medical procedure with real risks. If you are cramping repeatedly, an assessment that looks at your training load, pacing, heat acclimatisation and history is a better use of the money.

The best trial evidence is from a different population. A 2026 randomized trial in 114 adults aged 50 to 85 with idiopathic night cramps found daily compression stockings reduced cramp frequency and pain, while magnesium did not. Night cramps in older adults and cramps in the last third of a race may not share a mechanism, so this is encouraging rather than transferable. Low-risk to try.

That timing is one of the reasons fatigue-based explanations gained ground. The altered neuromuscular control hypothesis proposes sustained abnormal spinal reflex activity secondary to muscle fatigue, and cramping clusters in the later stages of hard efforts and in athletes going faster than their training prepared them for. The reviews are clear that fatigue alone does not inevitably produce cramp, so it is part of the picture rather than the whole answer.