Universität zu Köln

Koehler, Karsten ORCID: 0000-0002-9618-2069, Hoerner, Neele R., Gibbs, Jenna C., Zinner, Christoph, Braun, Hans, De Souza, Mary Jane and Schaenzer, Wilhelm (2016). Low energy availability in exercising men is associated with reduced leptin and insulin but not with changes in other metabolic hormones. J. Sports Sci., 34 (20). S. 1921 - 1930. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 1466-447X

Full text not available from this repository.

Abstract

Low energy availability, defined as low caloric intake relative to exercise energy expenditure, has been linked to endocrine alterations frequently observed in chronically energy-deficient exercising women. Our goal was to determine the endocrine effects of low energy availability in exercising men. Six exercising men (VO2peak: 49.3 +/- 2.4 ml . kg(-1) . min(-1)) underwent two conditions of low energy availability (15 kcal . kg(-1) fat-free mass [FFM] . day(-1)) and two energy-balanced conditions (40 kcal . kg(-1) FFM . day(-1)) in randomised order. During one low energy availability and one balanced condition, participants exercised to expend 15 kcal . kg(-1) FFM . day(-1); no exercise was conducted during the other two conditions. Metabolic hormones were assessed before and after each 4-day period. Following both low energy availability conditions, leptin (-53% to -56%) and insulin (-34% to -38%) were reduced (P < 0.05). Reductions in leptin and insulin were independent of whether low energy availability was attained with or without exercise (P > 0.80). Low energy availability did not significantly impact ghrelin, triiodothyronine, testosterone and IGF-1 (all P > 0.05). The observed reductions in leptin and insulin were in the same magnitude as changes previously reported in sedentary women. Further research is needed to understand why other metabolic hormones are more robust against low energy availability in exercising men than those in sedentary and exercising women.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Koehler, Karsten UNSPECIFIED orcid.org/0000-0002-9618-2069 UNSPECIFIED Hoerner, Neele R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gibbs, Jenna C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zinner, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Braun, Hans UNSPECIFIED UNSPECIFIED UNSPECIFIED De Souza, Mary Jane UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaenzer, Wilhelm UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-261192
DOI:	10.1080/02640414.2016.1142109
Journal or Publication Title:	J. Sports Sci.
Volume:	34
Number:	20
Page Range:	S. 1921 - 1930
Date:	2016
Publisher:	TAYLOR & FRANCIS LTD
Place of Publication:	ABINGDON
ISSN:	1466-447X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PHYSICALLY ACTIVE WOMEN; BODY-COMPOSITION; MENSTRUAL DISTURBANCES; HEALTHY-MEN; DEFICIENCY; RESTRICTION; ENDOCRINE; THRESHOLD; PROFILE; STRESS Multiple languages Sport Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26119