The following information was submitted:
Transactions: INTERNATIONAL JOURNAL of BIOLOGY and BIOMEDICAL ENGINEERING
Transactions ID Number: 20-639
Full Name: Sat Sharma
Position: Professor
Age: ON
Sex: Male
Address: 755 Wellington Crescent
Country: CANADA
Tel: 204 885 7887
Tel prefix: 1
Fax: 12042311927
E-mail address: ssharma@mts.net
Other E-mails: ssharma@sbgh.mb.ca
Title of the Paper: Hyponatremia during marathon running
Authors as they appear in the Paper: Marcus Blouw, Patrick Harnett, Akash Sharma, Cris LaBossiere, Sat Sharma
Email addresses of all the authors: ssharma@mts.net, mrblouw@gmail.com, umsharm2@cc.umanitoba.ca
Number of paper pages: 8
Abstract: Hyponatremia among marathon runners and endurance athletes has become an emerging topic for research and public concern following reports of serious illness and death. Weight gain due to excessive fluid consumption during the marathon race was proposed to be a major factor in the development of hyponatremia. We hypothesized that hyponatremia immediately following marathon completion is less common than previously reported and that post race fluid consumption is a critical factor in the development of hyponatremia. Blood, urine samples and body weight were collected up to 2 hours prior to start of the race, at race completion and at 1 hour after the race in 133 full and half marathon runners. At the race finish, each runner completed a brief questionnaire documenting consumption of fluids during the race. Serum sodium for all participants slightly increased from baseline (141.01.72 mmol/L) to race completion (141.83.09 mmol/L; p=0.0154), but signific!
antly reduced one hour after race completion (139.42.99 mmol/L; p<0.0001). Hyponatremia was identified in none of the participants prior to the race, but was found in 3 of 119 runners (2.52%) at race completion and in 8 of 84 runners (9.52%) 1-hour post-race. Runners with normal sodium levels lost 1.020.14 Kg of body weight from race start to 1 hour post-race, whereas, runners with hyponatremia gained 0.330.06 kg, p<0.01. Hyponatremia during marathon participation is less prevalent than previously reported. Our study demonstrates that hyponatremia is a consequence of excessive intake of hypotonic fluids following race completion.
Keywords: Hyponatremia, Marathon running, Exercise associated hyponatremia, EAH.
EXTENSION of the file: .doc
Special (Invited) Session: Does hyponatremia following marathon running develops during or after the race?
Organizer of the Session: 650-903
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