Electromyographic and kinetic comparison of a flexible and steel barbell

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Título: Electromyographic and kinetic comparison of a flexible and steel barbell
Autor/es: Hutchison, Randolph Edward | Caterisano, Anthony
Palabras clave: Power | Squat | Ground reaction forces | Muscle activity | Stabilizing
Área/s de conocimiento: Educación Física y Deportiva
Fecha de publicación: 2017
Editor: Universidad de Alicante. Área de Educación Física y Deporte
Cita bibliográfica: Journal of Human Sport and Exercise. 2017, 12(2): 380-385. doi:10.14198/jhse.2017.122.14
Resumen: Purpose: This research design compares mean peak integrated electromyography (I-EMG) and mean peak ground reaction forces (GRFs) between a standard steel Olympic barbell (SB) and flexible barbell (FB) during the squat (SQ) exercise for human subjects, as well as GRFs for a similar machine-driven lift. Methods: A lifting machine set atop a force plate and lifted either a SB or FB with a total loaded weight of 47.6 kg at a rate of 52 repetitions per minute for a minimum of 12 repetitions. Next, ten NCAA Division I football players familiarized with both bars were randomly assigned the SB and FB loaded at 30% one repetition maximum (1RM) and performed 7-10 repetitions at the same rate as the machine. I-EMG data was collected from surface electrodes placed on the legs and trunk according to the SENIAM protocol where appropriate. Results: Paired t-tests between the SB and FB revealed significant increases (p<0.05) in GRFs for the FB during the machine-driven lift and the SQ exercise. I-EMG was significantly higher for the FB when compared to the SB for the vastus lateralis (VL), rectus abdominis (RA), rectus femoris (RF) and external oblique (EO). Results show increases in some leg and trunk muscle activity and increases in GRFs when using a FB loaded at 30% 1RM for the SQ exercise when compared to a SB. Conclusions: A FB, when used under certain conditions, may illicit increased muscle activity for the SQ exercise for some leg and trunk muscle groups compared to a SB.
URI: http://dx.doi.org/10.14198/jhse.2017.122.14 | http://hdl.handle.net/10045/67976
ISSN: 1988-5202
DOI: 10.14198/jhse.2017.122.14
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: Licencia Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0
Revisión científica: si
Versión del editor: http://www.jhse.ua.es/
Aparece en las colecciones:Revistas - Journal of Human Sport and Exercise - 2017, Vol. 12, No. 2

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