Influence of Triathlon on the Electrolyte Balance (Ironman)

May 2, 2015 updated by: Dr. med. Stefan Braunecker, University Hospital of Cologne

Acid-base and Electrolyte Balance Among Triathletes in the Ironman European Championship

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

Study Overview

Status

Completed

Conditions

Hyponatremia

Intervention / Treatment

Behavioral: Education in nutrition

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.

Study Type

Observational

Enrollment (Actual)

1089

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Germany
- NRW
  - Köln, NRW, Germany, 50937
    - Uniklinik Köln

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 60 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Participants of a long-distance triathlon

Description

Inclusion Criteria:

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

Exclusion Criteria:

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

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Electrolyte balance Blood sodium Time Frame: within 20 minutes after finishing the race	within 20 minutes after finishing the race

Secondary Outcome Measures

Outcome Measure	Time Frame
Acid balance Time Frame: within 20 minutes after finishing the race	within 20 minutes after finishing the race

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University Hospital of Cologne

Investigators

Principal Investigator: Stefan Braunecker, M.D., University Hospital Cologne

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General 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.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

August 1, 2014

Primary Completion (Actual)

April 1, 2015

Study Completion (Actual)

May 1, 2015

Study Registration Dates

First Submitted

October 4, 2014

First Submitted That Met QC Criteria

October 8, 2014

First Posted (Estimate)

October 13, 2014

Study Record Updates

Last Update Posted (Estimate)

May 5, 2015

Last Update Submitted That Met QC Criteria

May 2, 2015

Last Verified