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CompletedNCT02263586IronmanUpdated May 5, 2015

Influence of Triathlon on the Electrolyte Balance

An observational study in Hyponatremia, sponsored by University Hospital of Cologne. Completed at 1 site in Germany. Open to participants aged 18 Years to 60 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2015-05-05.

Sponsored by University Hospital of Cologne · Observational

Study type
Observational
Model
Cohort
Time perspective
Retrospective
Enrollment
1,089
Ages
18 Years to 60 Years
Sex
All
01

Study summary

Aim of the study is examining the incidence of the occurrence of hyponatremia during a Triathlon

Read the detailed description

Studies in similar endurance sports (e.g. marathon) could already indicate a high incidence for the appearance of hyponatremia during competitions. The loss of sodium through sweating and the excessive fluid intake during the competitions is a primary risk factor for the development of hyponatremia.

Based on the known occurrence of hyponatremia in marathon runners, participants of the Ironman European Championship between the years 2005 and 2014 were screened for the occurrence of hyponatremia after finishing the race for safety reasons. Subjects were approached at random in the athlete's garden and invited to participate. All participants were 18 years or older.

02

Conditions studied

  • Hyponatremia

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Keywords

  • Ironman
  • Triathlon
03

In context

Hyponatremia

155 studies on the registry are indexed under Hyponatremia; 17 are open to participants now.

This study's enrollment of 1,089 is above the median of 180 across 57 observational studies indexed under Hyponatremia.

Browse Hyponatremia studies →

Lead sponsor

University Hospital of Cologne is the lead sponsor of 42 studies on the registry; 15 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 60 Years
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Probability sample

Study population

Participants of a long-distance triathlon

Inclusion criteria

  • finisher of a long-distance triathlon
  • > 18 years
  • \< 60 years

Exclusion criteria

Exclusion Criteria:

  • not finished a long-distance triathlon
  • \< 18 years
  • > 60 years
05

Study design

Observational model
Cohort
Time perspective
Retrospective
Enrollment
1,089 participants (actual)
Patient registry
No

Interventions

  • BehavioralEducation in nutrition

    Athletes were given a 45 min lesson on the proper diet and fluid intake to prevent hyponatremia in long-distance triathlon.

06

What researchers measure

Primary outcomes

  1. Electrolyte balance Blood sodium

    Time frame: within 20 minutes after finishing the race

Secondary outcomes

  1. Acid balance

    Time frame: within 20 minutes after finishing the race

07

Study locations

1 site
  • Uniklinik Köln
    Köln, NRW 50937, Germany
08

References and documents

Publications

  • Almond CS, Shin AY, Fortescue EB, Mannix RC, Wypij D, Binstadt BA, Duncan CN, Olson DP, Salerno AE, Newburger JW, Greenes DS. Hyponatremia among runners in the Boston Marathon. N Engl J Med. 2005 Apr 14;352(15):1550-6. doi: 10.1056/NEJMoa043901. PubMed 15829535 ↗
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on May 5, 2015, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT02263586
Lead sponsor
University Hospital of Cologne
Responsible party
Dr. med. Stefan Braunecker (Anesthesiologist, Researcher, University Hospital of Cologne) — Principal investigator
First posted
Oct 13, 2014
Start date
Aug 2014
Primary completion
Apr 2015
Completion
May 2015
Last update
May 5, 2015

Study contacts

Stefan Braunecker, M.D.
principal investigator · University Hospital Cologne

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in May 2015. You cannot join it, but the record below documents what was studied.

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