Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/35509
Title: Aberrant Mechanical Efficiency during Exercise Relates to Metabolic Health and Exercise Intolerance in Adolescents with Obesity
Authors: FRANSSEN, Wouter 
MASSA, Guy 
OP 'T EIJNDE, Bert 
DENDALE, Paul 
HANSEN, Dominique 
VERBOVEN, Kenneth 
Issue Date: 2021
Publisher: MDPI
Source: International journal of environmental research and public health (Print), 18 (20) (Art N° 10578)
Abstract: Mechanical efficiency (ME) might be an important parameter evaluating cardiometabolic health and the effectiveness of physical activity interventions in individuals with obesity. However, whether these cardiometabolic risk factors may relate to ME in adolescents with obesity is not known yet. Therefore, this study aims to compare the mechanical efficiency during maximal exercise testing between adolescents with obesity and lean adolescents, and to examine associations with exercise tolerance and metabolic health. Methods. Twenty-nine adolescents with obesity (BMI SDS: 2.11 ± 0.32, age: 13.4 ± 1.1 years, male/female: 15/14) and 29 lean (BMI SDS: −0.16 ± 0.84, age: 14.0 ± 1.5 years, male/female: 16/13) adolescents performed a maximal cardiopulmonary exercise test from which the net mechanical efficiency (MEnet) and substrate oxidation (carbohydrates and lipids) were calculated. Indicators for peak performance were collected. Biochemistry (lipid profile, glycaemic control, inflammation, leptin) was studied in fasted blood samples. Regression analyses were applied to examine relations between MEnet and exercise tolerance or blood variables in the total group. Results. Peak work rate (WRpeak), oxygen uptake (V̇ O2peak)/WRpeak, ME, and MEnet were significantly lower (p < 0.05) in adolescents with obesity compared to their lean counterparts (p < 0.05). Furthermore, a reduced MEnet was independently related to a lower WRpeak (SC β = 2.447; p < 0.001) and elevated carbohydrate oxidation during exercise (SC β = −0.497; p < 0.001), as well as to elevated blood low-density lipoprotein cholesterol (SC β = −0.275; p = 0.034) and fasting glucose (SC β = −0.256; p = 0.049) concentration. Conclusion. In adolescents with obesity, the mechanical efficiency is lowered during exercise and this relates to exercise intolerance and a worse metabolic health.
Keywords: exercise tolerance;mechanical efficiency;physical fitness;metabolic risk factors;adolescents
Document URI: http://hdl.handle.net/1942/35509
ISSN: 1661-7827
e-ISSN: 1660-4601
DOI: 10.3390/ijerph182010578
ISI #: 000726434500001
Rights: Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses /by/4.0/).
Category: A1
Type: Journal Contribution
Validations: ecoom 2022
Appears in Collections:Research publications

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