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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/1049

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Title: A biomechanical analysis of straight and hexagonal barbell deadlifts using submaximal loads
Authors: Swinton, Paul A.
Stewart, Arthur
Agouris, Ioannis
Keogh, Justin W. L.
Lloyd, Ray
Affiliation: University of Abertay Dundee. School of Social & Health Sciences
Keywords: Force
Kinematics
Kinetics
Power
Resistance training
Velocity
Issue Date: Jul-2011
Publisher: Lippincott Williams & Wilkins
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Lippincott, Williams & Wilkins
Citation: Swinton, P.A., et al. 2011. A biomechanical analysis of straight and hexagonal barbell deadlifts using submaximal loads. Journal of Strength & Conditioning Research. 25(7): pp.2000-2009. Available from http://dx.doi.org/10.1519/JSC.0b013e3181e73f87
Abstract: The purpose of the investigation was to compare the kinematics and kinetics of the deadlift performed with 2 distinct barbells across a range of submaximal loads. Nineteen male powerlifters performed the deadlift with a conventional straight barbell and a hexagonal barbell that allowed the lifter to stand within its frame. Subjects performed trials at maximum speed with loads of 10, 20, 30, 40, 50, 60, 70, and 80% of their predetermined 1-repetition maximum (1RM). Inverse dynamics and spatial tracking of the external resistance were used to quantify kinematic and kinetic variables. Subjects were able to lift a heavier 1RM load in the hexagonal barbell deadlift (HBD) than the straight barbell deadlift (SBD) (265 ± 41 kg vs. 245 ± 39 kg, p < 0.05). The design of the hexagonal barbell significantly altered the resistance moment at the joints analyzed (p < 0.05), resulting in lower peak moments at the lumbar spine, hip, and ankle (p < 0.05) and an increased peak moment at the knee (p < 0.05). Maximum peak power values of 4,388 ± 713 and 4,872 ± 636 W were obtained for the SBD and HBD, respectively (p < 0.05). Across the submaximal loads, significantly greater peak force, peak velocity and peak power values were produced during the HBD compared to during the SBD (p < 0.05). The results demonstrate that the choice of barbell used to perform the deadlift has a significant effect on a range of kinematic and kinetic variables. The enhanced mechanical stimulus obtained with the hexagonal barbell suggests that in general the HBD is a more effective exercise than the SBD.
URI: http://hdl.handle.net/10373/1049
ISSN: 1064-8011
Appears in Collections:Social & Health Sciences Collection

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