Fluid Metabolism in Athletes Running Seven Marathons in Seven Consecutive Days

Frontiers in Physiology
Daniela ChlíbkováJosef Bednář

Abstract

Purpose: Hypohydration and hyperhydration are significant disorders of fluid metabolism in endurance performance; however, little relevant data exist regarding multi-stage endurance activities. The aim of the present study was to examine the effect of running seven marathons in 7 consecutive days on selected anthropometric, hematological and biochemical characteristics with an emphasis on hydration status.Methods:Participants included 6 women and 20 men (age 42.6 ± 6.2 years). Data was collected before day 1 (B1) and after day 1 (A1), 4 (A4), and 7 (A7).Results:The average marathon race time was 4:44 h:min (ranging from 3:09 - 6:19 h:min). Plasma sodium, plasma potassium and urine sodium were maintained during the race. Body mass (p< 0.001, η2= 0.501), body fat (p< 0.001, η2= 0.572) and hematocrit (p< 0.001, η2= 0.358) decreased. Plasma osmolality (Posm) (p< 0.001, η2= 0.416), urine osmolality (Uosm) (p< 0.001, η2= 0.465), urine potassium (p< 0.001, η2= 0.507), urine specific gravity (Usg) (p< 0.001, η2= 0.540), plasma urea (PUN) (p< 0.001, η2= 0.586), urine urea (UUN) (p< 0.001, η2= 0.532) and transtubular potassium gradient (p< 0.001, η2= 0.560) increased at A1, A4, and A7vs. B1. Posm correlated with PUN at A1(r= 0.59,p= 0.00...Continue Reading

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Citations

Jul 17, 2018·Frontiers in Psychology·Daniel KrokoszWojciech Ratkowski
Oct 28, 2019·European Journal of Preventive Cardiology·Christopher KlenkArno Schmidt-Trucksäss
Jan 9, 2021·Medical Hypotheses·Simone KönigUwe Schütz
Aug 24, 2021·European Journal of Preventive Cardiology·Christopher KlenkArno Schmidt-Trucksäss

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Methods Mentioned

BETA
blood collection

Software Mentioned

SPSS
Lomnice
MINITAB

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