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Pre-race characteristics and race performance in hyponatremic and normonatremic finishers of Czech ultra-races


Chlibkova, Daniela; Rosemann, Thomas; Knechtle, Beat; Sengeis, Marietta; Posh, Lenka; Tomaskova, Ivana (2016). Pre-race characteristics and race performance in hyponatremic and normonatremic finishers of Czech ultra-races. Acta Gymnica, 46(3):109-116.

Abstract

Background: Exercise-associated hyponatremia (EAH) is used to describe hyponatremia occurring during or up to 24 hours after physical activity. Objective: The aim of the study was to compare pre-race characteristics, race performance and plasma sodium [Na+] levels of hyponatremic and normonatremic ultra-endurance athletes and chosen variables in all finishers (N = 138). We assessed age, gender, club membership, pre-race training history and experience, pre-race body mass and body mass index (BMI) in 138 finishers of ultra-races (stage mountain bikers, 24 hours mountain bikers, 24 hours ultra-runners and 100 km ultra-runners) and post-race plasma [Na+] in a subgroup of 113 ultra-athletes. Methods: The 138 participants completed a pre-race questionnaire survey and underwent body mass measurement, of those, 113 provided blood samples pre and post-race. Results: There were no group differences between hyponatremic and normonatremic ultra-athletes in age, gender, club membership, prerace BMI, regular training, experience or race placement. Pre-race body mass and BMI related to race placement in the normonatremic group (r = .30, p < .01; r = .43, p < .01). Faster finishers were older (r = –.28, p = .001) and more experienced (r = –.19, p = .02) than slower finishers (N = 138). Lower pre-race body mass and BMI (r = .28, p < .01; r = .49, p < .001) was associated with lower absolute order; however, did not related to age (N = 138). A higher weekly training volume was associated with a lower pre-race body mass (r = –.49, p < .01) in female racers; however, it did not relate to pre-race BMI (r = –.21, p = .41) or race placement (r = –.20, p = .56). Conclusion: Pre-race characteristics did not distinguish those finishers developing EAH from those not developing EAH

Abstract

Background: Exercise-associated hyponatremia (EAH) is used to describe hyponatremia occurring during or up to 24 hours after physical activity. Objective: The aim of the study was to compare pre-race characteristics, race performance and plasma sodium [Na+] levels of hyponatremic and normonatremic ultra-endurance athletes and chosen variables in all finishers (N = 138). We assessed age, gender, club membership, pre-race training history and experience, pre-race body mass and body mass index (BMI) in 138 finishers of ultra-races (stage mountain bikers, 24 hours mountain bikers, 24 hours ultra-runners and 100 km ultra-runners) and post-race plasma [Na+] in a subgroup of 113 ultra-athletes. Methods: The 138 participants completed a pre-race questionnaire survey and underwent body mass measurement, of those, 113 provided blood samples pre and post-race. Results: There were no group differences between hyponatremic and normonatremic ultra-athletes in age, gender, club membership, prerace BMI, regular training, experience or race placement. Pre-race body mass and BMI related to race placement in the normonatremic group (r = .30, p < .01; r = .43, p < .01). Faster finishers were older (r = –.28, p = .001) and more experienced (r = –.19, p = .02) than slower finishers (N = 138). Lower pre-race body mass and BMI (r = .28, p < .01; r = .49, p < .001) was associated with lower absolute order; however, did not related to age (N = 138). A higher weekly training volume was associated with a lower pre-race body mass (r = –.49, p < .01) in female racers; however, it did not relate to pre-race BMI (r = –.21, p = .41) or race placement (r = –.20, p = .56). Conclusion: Pre-race characteristics did not distinguish those finishers developing EAH from those not developing EAH

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Institute of General Practice
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2016
Deposited On:06 Jan 2017 09:17
Last Modified:06 Jan 2017 10:14
Publisher:Univerzita Palackeho v Olomouci * Fakulta Telesne Kultury
ISSN:2336-4912
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.5507/ag.2016.013
Official URL:http://gymnica.upol.cz/pdfs/gym/2016/03/01.pdf

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