Cause of exercise associated muscle cramps (EAMC)--altered neuromuscular control, dehydration or electrolyte depletion?
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing existing literature without formal systematic review methodology
PubMed 18981039 · doi:10.1136/bjsm.2008.050401
What was done
The author reviewed scientific evidence for two hypotheses regarding the cause of exercise-associated muscle cramps (EAMC): (1) electrolyte depletion and dehydration, and (2) altered neuromuscular control, assessing published literature using evidence-based medicine criteria.
What was found
Scientific evidence for the electrolyte depletion and dehydration hypothesis consisted of anecdotal observations, case series totaling 18 cases, and one small case-control study (n = 10), whereas four prospective cohort studies did not support this hypothesis. The altered neuromuscular control hypothesis was supported by human experimental models of muscle cramping, epidemiological studies in athletes, and animal data.
Why it matters
This review challenges the common assumption that exercise-associated muscle cramps stem primarily from fluid or salt losses, emphasizing altered neuromuscular control as the more scientifically supported mechanism.
Limits
This is a narrative review rather than a systematic review or meta-analysis. The abstract provides no specific statistical effect sizes or risk-of-bias assessments, and the total number of evaluated studies is not stated.
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