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.
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Abbreviations
- APHV:
-
Age from peak height velocity
- BMI:
-
Body mass index
- BF:
-
Body fat
- DXA:
-
Dual-energy X-ray absorptiometry
- EMG:
-
Electromyography
- FFM:
-
Fat-free mass
- KE:
-
Knee extensors
- MVC:
-
Maximal voluntary contraction
- M-wave:
-
Compound action potential amplitude
- Qtwpot :
-
Potentiated twitch torque
- RF:
-
Rectus femoris
- VA:
-
Voluntary activation
- VL:
-
Vastus lateralis
- VM:
-
Vastus medialis
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Acknowledgments
This project was funded by a grant of the Auvergne Regional Council (New Researcher Program 2012—Vincent Martin).
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The authors report no conflict of interest. A funding from the Auvergne Regional Council (New Researcher Program 2012—Vincent Martin) was received for this project. This work is known to and agreed by the co-authors identified on the manuscript’s title page. This work required more than six people, because of clinical examination (physician or pediatrician), recruitment of volunteers, experimental procedures, statistical analysis and data analysis.
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Communicated by Jean-René Lacour.
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Garcia-Vicencio, S., Martin, V., Kluka, V. et al. Obesity-related differences in neuromuscular fatigue in adolescent girls. Eur J Appl Physiol 115, 2421–2432 (2015). https://doi.org/10.1007/s00421-015-3222-9
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DOI: https://doi.org/10.1007/s00421-015-3222-9