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Decrease in body fat during an ultra-endurance triathlon is associated with race intensity


Knechtle, B; Schwanke, M; Knechtle, P; Kohler, G (2008). Decrease in body fat during an ultra-endurance triathlon is associated with race intensity. British Journal of Sports Medicine, 42(7):609-613.

Abstract

Objective: To investigate whether adipose subcutaneous
tissue or skeletal muscle mass decreased during a nonstop
ultra-endurance triathlon.
Design: Descriptive field study.
Setting: The Triple Iron Triathlon Germany 2006 in Lensahn: 11.6 km swimming, 540 km cycling and 126.6 km running.
Subjects: 17 male Caucasian triathletes, mean (SD) age
39.2 (7.5) years, height 178 (5) cm, body mass 80.7 (8.9) kg and body mass index (BMI) 25.4 (2.4) kg/m2.
Interventions: None.
Main outcome measurements: Determination of body mass, skin-fold thicknesses, limb circumference, skeletal muscle mass and percentage body fat in order to show changes after the race.
Results: A significant decrease was shown for body mass (p,0.001), BMI (p,0.001) and calculated percentage body fat (p,0.001) whereas skeletal muscle mass did not change significantly (p.0.05). Circumferences of the thigh, upper arm and calf did not decrease significantly (p.0.05), whereas all skin-fold thicknesses decreased significantly (p,0.05), with the exception of those at the chest and thigh. A significant correlation was found between the loss of percentage body fat and the loss of body mass (p,0.01, r2=0.55) as well as change in percentage body fat with race
performance (p,0.05, r2=0.24).
Conclusions: Ultra-endurance triathletes at the Triple
Iron Triathlon Germany 2006 showed a significant decrease in body mass and percentage body fat, where decrease in percentage body fat was associated with race intensity.

Objective: To investigate whether adipose subcutaneous
tissue or skeletal muscle mass decreased during a nonstop
ultra-endurance triathlon.
Design: Descriptive field study.
Setting: The Triple Iron Triathlon Germany 2006 in Lensahn: 11.6 km swimming, 540 km cycling and 126.6 km running.
Subjects: 17 male Caucasian triathletes, mean (SD) age
39.2 (7.5) years, height 178 (5) cm, body mass 80.7 (8.9) kg and body mass index (BMI) 25.4 (2.4) kg/m2.
Interventions: None.
Main outcome measurements: Determination of body mass, skin-fold thicknesses, limb circumference, skeletal muscle mass and percentage body fat in order to show changes after the race.
Results: A significant decrease was shown for body mass (p,0.001), BMI (p,0.001) and calculated percentage body fat (p,0.001) whereas skeletal muscle mass did not change significantly (p.0.05). Circumferences of the thigh, upper arm and calf did not decrease significantly (p.0.05), whereas all skin-fold thicknesses decreased significantly (p,0.05), with the exception of those at the chest and thigh. A significant correlation was found between the loss of percentage body fat and the loss of body mass (p,0.01, r2=0.55) as well as change in percentage body fat with race
performance (p,0.05, r2=0.24).
Conclusions: Ultra-endurance triathletes at the Triple
Iron Triathlon Germany 2006 showed a significant decrease in body mass and percentage body fat, where decrease in percentage body fat was associated with race intensity.

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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:July 2008
Deposited On:13 Feb 2009 10:51
Last Modified:05 Apr 2016 12:59
Publisher:BMJ Publishing Group
ISSN:0306-3674
Publisher DOI:10.1136/bjsm.2007.040956
PubMed ID:18048432
Permanent URL: http://doi.org/10.5167/uzh-13201

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