Study2025Open access

Defecation after magnesium supplementation enhances cognitive performance in triathletes

Wei CC, Harris MB, Ye M, Nicholls A, Alkhatib A, Dewi L, Huang CY, Kuo CH

Sports medicine and health science · 2 citations

How it was studied

Design
Randomized controlled trial (classified by our AI screen)
Studied in
People
Main outcome
Health markers and function

Who paid for it

Funding
Independent funding

Based on full-text disclosure statement.

Publication

Published
2024-04-04 · Sports Med Health Sci · vol. 7 · issue 2 · pp. 102–108
Publisher
Elsevier BV
Cited
2 citations · more than 56% of similar papers · 0.4× the field average
References
24 works
Access
Open access (free to publish) · CC-BY-NC-ND
Research areas
Magnesium in Health and Disease · Therapeutic Uses of Natural Elements · Thermoregulation and physiological responses
Keywords
Defecation, Stroop effect, Anesthesia, Medicine, Psychology, Crossover study, Internal medicine, Effects of sleep deprivation on cognitive performance, Wisconsin Card Sorting Test, Cognition, Psychiatry, Pathology

8 authors

From TW, US, CN, GB, ID

  • Chen-Chan WeiUniversity of Taipei
  • Michael Brennan HarrisWilliam & Mary; Williams (United States)
  • Mengxin YeZhejiang Normal University
  • Andrew NichollsUniversity of Taipei
  • Ahmad H. AlKhatibBirmingham City University
  • Luthfia DewiUniversity of Taipei; Universitas Muhammadiyah Semarang

Abstract

Constipation is correlated with diminished cognitive function, revealing a possible rectum-brain connection. In this counter-balanced crossover trial, 13 elite triathletes underwent a Stroop test to assess cognitive function and executive control. The Stroop test was conducted both with and without magnesium oxide intake, with a 1-week washout period between sessions. Oxygenation and blood distribution during the cognitive challenge were measured using Near-Infrared Spectroscopy (NIRS). Measurements were taken in both the prefrontal brain and the sub-navel region, where the highest glucose uptake was detected under the 18F-fluorodeoxyglucose Positron Emission Tomography (PET) scan. A significant reduction in completion time for the Stroop test was observed after defecation compared to the non-defecated condition (non-defecation: [27.1 ​± ​1.1] s; non-magnesium defecation: [24.4 ​± ​0.9] s; magnesium defecation: [23.4 ​± ​0.8] s, p ​p ​< ​0.05). This data suggests an acute increase in oxygen consumption at this specific region. The result of this study suggests an unexplored causal link between the state of the rectum and cognitive performance. Magnesium supplementation to improved rectal emptying presents a novel application for optimizing cognitive function in athletes navigating intricate racing conditions.

Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).

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