Universität zu Köln

Geesmann, Bjoern, Gibbs, Jenna C., Mester, Joachim and Koehler, Karsten (2017). Association Between Energy Balance and Metabolic Hormone Suppression During Ultraendurance Exercise. Int. J. Sport Physiol. Perform., 12 (7). S. 984 - 990. CHAMPAIGN: HUMAN KINETICS PUBL INC. ISSN 1555-0273

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Abstract

Ultraendurance athletes often accumulate an energy deficit when engaging in ultraendurance exercise, and on completion of the exercise, they exhibit endocrine changes that are reminiscent of starvation. However, it remains unclear whether these endocrine changes are a result of the exercise per se or secondary to the energy deficit and, more important, whether these changes can be attenuated by increased dietary intake. The goal of the study was to assess the relationship between changes in key metabolic hormones after ultraendurance exercise and measures of energy balance. Metabolic hormones, as well as energy intake and expenditure, were assessed in 14 well-trained male cyclists who completed a 1230-km ultraendurance cycling event. After completion of the event, serum testosterone (-67% +/- 18%), insulin-like growth factor-1 (IGF-1) (-45% +/- 8%), and leptin (-79% +/- 9%) were significantly suppressed (P < .001) and remained suppressed after a 12-h recovery period (P < .001). Changes in IGF-1 were positively correlated with energy balance over the course of the event (r = .65, P = .037), which ranged from an 11,859-kcal deficit to a 3593-kcal surplus. The marked suppression of testosterone, IGF-1, and leptin after ultraendurance exercise is comparable to changes occurring during acute starvation. The suppression of IGF-1, but not that of other metabolic hormones, was strongly associated with the magnitude of the energy deficit, indicating that athletes who attained a greater energy deficit exhibited a more pronounced drop in IGF-1. Future studies are needed to determine whether increased dietary intake can attenuate the endocrine response to ultraendurance exercise.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Geesmann, Bjoern UNSPECIFIED UNSPECIFIED UNSPECIFIED Gibbs, Jenna C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mester, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED Koehler, Karsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-222160
DOI:	10.1123/ijspp.2016-0061
Journal or Publication Title:	Int. J. Sport Physiol. Perform.
Volume:	12
Number:	7
Page Range:	S. 984 - 990
Date:	2017
Publisher:	HUMAN KINETICS PUBL INC
Place of Publication:	CHAMPAIGN
ISSN:	1555-0273
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DOUBLY LABELED WATER; BODY-COMPOSITION; AMERICA RAAM; SHORT-TERM; IGF-I; MEN; MARATHON; LEPTIN; RACE; PROFILE Multiple languages Physiology; Sport Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22216