Erschienen in:
01.11.2015 | Original Article
Obesity-related differences in neuromuscular fatigue in adolescent girls
verfasst von:
Sebastian Garcia-Vicencio, Vincent Martin, Virginie Kluka, Charlotte Cardenoux, Anne-Gaëlle Jegu, Anne-Véronique Fourot, Emmanuel Coudeyre, Sébastien Ratel
Erschienen in:
European Journal of Applied Physiology
|
Ausgabe 11/2015
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Abstract
Purpose
The aim of this study was to investigate
the effect of obesity on neuromuscular fatigue in adolescent girls.
Methods
Twelve lean (13.6 ± 0.8 years) and 12 obese (13.9 ± 0.9 years) girls repeated 5-s maximal voluntary contractions (MVC) of the knee extensors until the generated torque reached 55 % of its initial value. Magnetic stimulations were delivered to the femoral nerve every five MVCs to follow the course of voluntary activation (VA) and potentiated twitch torque (Qtwpot).
Results
Torque reached 55 % of its initial value after 52.6 ± 20.4 and 74.9 ± 22.8 repetitions in obese and lean girls, respectively (p < 0.01). Furthermore, the decline of VA was smaller in obese girls (p < 0.001). In contrast, Qtwpot decreased to a greater extent in obese girls (p < 0.05).
Conclusions
Obese girls fatigue faster than their lean counterparts. The peripheral factors mainly account for fatigue in obese girls, whereas central factors are mainly involved in lean girls.