Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Changes in serum electrolyte levels during marathon running.

I Cohen, A L Zimmerman

    South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
    |March 25, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    A novel cyclic nucleotide-gated ion channel enriched in synaptic terminals of isotocin neurons in zebrafish brain and pituitary.

    Neuroscience·2009
    Same author

    Beta-ionone activates and bleaches visual pigment in salamander photoreceptors.

    Visual neuroscience·2009
    Same author

    A rare solitary fibrous tumour of the lacrimal sac presenting as acquired nasolacrimal duct obstruction.

    Eye (London, England)·2003
    Same author

    [Elastofibroma, a rare cause of snapping scapula syndrome].

    Harefuah·2002
    Same author

    Mitochondrial permeability transition as a novel principle of hepatorenal toxicity in vivo.

    Apoptosis : an international journal on programmed cell death·2002
    Same author

    Ambulatory blood pressure monitoring in children with a solitary kidney - a comparison between unilateral renal agenesis and uninephrectomy.

    Blood pressure monitoring·2002
    Same journal

    SAMA Health Summit Abstracts.

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2026
    Same journal

    On behalf of the South African Medical Association (SAMA), The Scientific Committee of the SAMA Health Summit, is pleased to pesent this abstract issue, showcasing the posters and oral presentations delivered at the Summit, which was held from 22-24 May 2026.

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2026
    Same journal

    Proceedings of the 2<sup>nd</sup> Data Driven Surgery Conference (DDSC 2025).

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2026
    Same journal

    Clinical practice guidelines for the management of fever and neutropenia in South African children and adolescents with cancer.

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2026
    Same journal

    The changing fortunes of the District Health System in SA (1994 - 2020): A retrospective review.

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2026
    Same journal

    Thomas Micheal Guntram Ignaz Rehle (1951 - 2025).

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2026
    See all related articles

    During marathon running, serum magnesium levels significantly decrease, while potassium and sodium increase. Athletes should increase fluid intake but avoid potassium, magnesium, and salt supplementation.

    Area of Science:

    • Exercise Physiology
    • Sports Nutrition
    • Biochemistry

    Background:

    • Marathon running leads to significant fluid and electrolyte loss through sweat.
    • Understanding electrolyte shifts during prolonged exercise is crucial for athlete health and performance.

    Purpose of the Study:

    • To investigate the changes in serum electrolytes and plasma volume in long-distance runners after a marathon.
    • To provide evidence-based recommendations for fluid and electrolyte intake during endurance events.

    Main Methods:

    • Serum electrolyte concentrations (sodium, potassium, magnesium, chloride) were measured before and after a 42 km marathon in 18 trained runners.
    • Sweat losses, water deficits, plasma volume changes, and total circulating plasma electrolytes were assessed.

    Related Experiment Videos

    Main Results:

    • A significant decrease in serum magnesium was observed, alongside increases in serum potassium and sodium.
    • Changes in plasma volume correlated with alterations in total circulating plasma sodium and chloride.
    • Subjective evidence suggested benefits from glucose supplementation.

    Conclusions:

    • Athletes should increase fluid intake during marathons, regardless of weather conditions.
    • Potassium and magnesium supplementation are not recommended for marathon runners.
    • Salt intake is generally unnecessary for races exceeding marathon distance.