Maintained hydration status after a 24-h winter mountain running race under extremely cold conditions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26630%2F19%3APU130191" target="_blank" >RIV/00216305:26630/19:PU130191 - isvavai.cz</a>

Result on the web

<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6336898/" target="_blank" >https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6336898/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3389/fphys.2018.01959" target="_blank" >10.3389/fphys.2018.01959</a>

Result language

angličtina

Original language name

Maintained hydration status after a 24-h winter mountain running race under extremely cold conditions

Original language description

Background: To date, no study has examined the hydration status of runners competing in a 24-h winter race under extremely cold environmental conditions. Therefore, the aim was to examine the effect of a 24-h race under an average temperature of -14.3◦C on hydration status. Methods: Blood and urine parameters and body mass (BM) were assessed in 20 finishers (women,n= 6; men,n= 14) pre- and post-race. Results: Five (25%) ultra-runners had lower pre-race plasma sodium [Na+] and 11(52%) had higher pre-race plasma potassium [K+] values than the reference ranges.Post-race plasma [Na+], plasma osmolality, urine osmolality and urine specific gravity remained stable (p > 0.05). The estimated fluid intake did not differ (p>0.05) between women (0.30±0.06 L/h) and men (0.46±0.21 L/h). Runners with a higher number of completed ultra-marathons (r=−0.50,p= 0.024) and higher number of training kilometers (r=−0.68,p= 0.001) drank less than those with lower running experience. Pre-race and post-race plasma [Na+] were related to plasma osmolality (r= 0.65,p= 0.002,r= 0.69,p<0.001, respectively) post-race, but not to fluid intake (p>0.05). BM significantly decreased post-race (p= 0.002) and was not related to plasma [Na+]or fluid intake (p>0.05). Post-race hematocrit and plasma [K+] decreased (p<0.001)and transtubular potassium gradient increased (p= 0.008). Higher pre-race plasma [K+]was related to higher plasma [K+] loss post-race (p =−0.85,p<0.001). Conclusion: Hydration status remained stable despite the extremely cold winterweather conditions. Overall fluid intake was probably sufficient to replenish the hydrationneeds of 24-h runners. Current recommendations may be too high for athletes competing in extremely cold conditions.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

30105 - Physiology (including cytology)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Frontiers in Physiology

ISSN

1664-042X

e-ISSN

—

Volume of the periodical

neuveden

Issue of the periodical within the volume

9

Country of publishing house

CH - SWITZERLAND

Number of pages

10

Pages from-to

1959-1969

UT code for WoS article

000455549100001

EID of the result in the Scopus database

2-s2.0-85065512981