UZH-Logo

Maintenance Infos

Do ultra-runners in a 24-h run really dehydrate?


Knechtle, B; Wirth, A; Knechtle, P; Rosemann, T; Senn, O (2011). Do ultra-runners in a 24-h run really dehydrate? Irish Journal of Medical Science, 180(1):129-134.

Abstract

BACKGROUND: Loss of body mass during a 24-h run was considered to be a result of dehydration.

AIMS: We intended to quantify the decrease in body mass as a loss in fat mass or skeletal muscle mass and to quantify the change in hydration status.

METHODS: Body mass, fat mass, skeletal muscle mass, haematocrit, plasma sodium and urinary specific gravity were measured in 15 ultra-marathoners in a 24-h run.

RESULTS: Body mass decreased by 2.2 kg (p = 0.0009) and fat mass decreased by 0.5 kg (p = 0.0084). The decrease in body mass correlated to the decrease in fat mass (r = 0.72, p = 0.0024). Urinary specific gravity increased from 1.012 to 1.022 g/mL (p = 0.0005).

CONCLUSIONS: The decrease in body mass and the increase in urinary specific gravity indicate dehydration. The decrease in body mass was correlated to the decrease in fat mass and therefore not only due to dehydration.

BACKGROUND: Loss of body mass during a 24-h run was considered to be a result of dehydration.

AIMS: We intended to quantify the decrease in body mass as a loss in fat mass or skeletal muscle mass and to quantify the change in hydration status.

METHODS: Body mass, fat mass, skeletal muscle mass, haematocrit, plasma sodium and urinary specific gravity were measured in 15 ultra-marathoners in a 24-h run.

RESULTS: Body mass decreased by 2.2 kg (p = 0.0009) and fat mass decreased by 0.5 kg (p = 0.0084). The decrease in body mass correlated to the decrease in fat mass (r = 0.72, p = 0.0024). Urinary specific gravity increased from 1.012 to 1.022 g/mL (p = 0.0005).

CONCLUSIONS: The decrease in body mass and the increase in urinary specific gravity indicate dehydration. The decrease in body mass was correlated to the decrease in fat mass and therefore not only due to dehydration.

Citations

13 citations in Web of Science®
15 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

1 download since deposited on 15 Feb 2011
0 downloads since 12 months
Detailed statistics

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:2011
Deposited On:15 Feb 2011 15:10
Last Modified:05 Apr 2016 14:47
Publisher:Springer
ISSN:0021-1265
Publisher DOI:https://doi.org/10.1007/s11845-010-0500-8
PubMed ID:20512663
Permanent URL: https://doi.org/10.5167/uzh-45854

Download

[img]
Filetype: PDF - Registered users only
Size: 1MB
View at publisher

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations