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Fluid Metabolism in Athletes Running Seven Marathons in Seven Consecutive Days


Chlíbková, Daniela; Nikolaidis, Pantelis T; Rosemann, Thomas; Knechtle, Beat; Bednář, Josef (2018). Fluid Metabolism in Athletes Running Seven Marathons in Seven Consecutive Days. Frontiers in Physiology, 9:91.

Abstract

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. Participants included 6 women and 20 men (age 42.6 ± 6.2 years). Data was collected before day 1 (B) and after day 1 (A), 4 (A), and 7 (A). 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 ( < 0.001, η = 0.501), body fat ( < 0.001, η = 0.572) and hematocrit ( < 0.001, η = 0.358) decreased. Plasma osmolality (Posm) ( < 0.001, η = 0.416), urine osmolality (Uosm) ( < 0.001, η = 0.465), urine potassium ( < 0.001, η = 0.507), urine specific gravity (Usg) ( < 0.001, η = 0.540), plasma urea (PUN) ( < 0.001, η = 0.586), urine urea (UUN) ( < 0.001, η = 0.532) and transtubular potassium gradient ( < 0.001, η = 0.560) increased at A, A, and A vs. B. Posm correlated with PUN at A ( = 0.59, = 0.001) and A ( = 0.58, = 0.002). The reported post-race fluid intake was 0.5 ± 0.2 L/h and it correlated negatively with plasma [Na] ( = -0.42, = 0.007) at A and ( = -0.50, = 0.009) at A. Uosm was associated with UUN at A ( = 0.80, < 0.001), at A ( = 0.81, < 0.001) and at A ( = 0.86, < 0.001) and with Usg ( = 0.71, < 0.001) at A, ( = 0.52, = 0.006) at A and ( = 0.46, = 0.02) at A. Despite the decrease in body mass, fluid and electrolyte balance was maintained with no decrease in plasma volume after running seven marathons in seven consecutive days. Current findings support the hypothesis that body mass changes do not reflect changes in the hydration status during prolonged exercise.

Abstract

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. Participants included 6 women and 20 men (age 42.6 ± 6.2 years). Data was collected before day 1 (B) and after day 1 (A), 4 (A), and 7 (A). 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 ( < 0.001, η = 0.501), body fat ( < 0.001, η = 0.572) and hematocrit ( < 0.001, η = 0.358) decreased. Plasma osmolality (Posm) ( < 0.001, η = 0.416), urine osmolality (Uosm) ( < 0.001, η = 0.465), urine potassium ( < 0.001, η = 0.507), urine specific gravity (Usg) ( < 0.001, η = 0.540), plasma urea (PUN) ( < 0.001, η = 0.586), urine urea (UUN) ( < 0.001, η = 0.532) and transtubular potassium gradient ( < 0.001, η = 0.560) increased at A, A, and A vs. B. Posm correlated with PUN at A ( = 0.59, = 0.001) and A ( = 0.58, = 0.002). The reported post-race fluid intake was 0.5 ± 0.2 L/h and it correlated negatively with plasma [Na] ( = -0.42, = 0.007) at A and ( = -0.50, = 0.009) at A. Uosm was associated with UUN at A ( = 0.80, < 0.001), at A ( = 0.81, < 0.001) and at A ( = 0.86, < 0.001) and with Usg ( = 0.71, < 0.001) at A, ( = 0.52, = 0.006) at A and ( = 0.46, = 0.02) at A. Despite the decrease in body mass, fluid and electrolyte balance was maintained with no decrease in plasma volume after running seven marathons in seven consecutive days. Current findings support the hypothesis that body mass changes do not reflect changes in the hydration status during prolonged exercise.

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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:2018
Deposited On:04 Jul 2018 12:06
Last Modified:01 Aug 2018 01:03
Publisher:Frontiers Research Foundation
ISSN:1664-042X
OA Status:Gold
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.3389/fphys.2018.00091
PubMed ID:29483882

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