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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/1236

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Title: Effect of load positioning on the kinematics and kinetics of weighted vertical jumps
Authors: Swinton, Paul A.
Stewart, Arthur D.
Lloyd, Ray
Agouris, Ioannis
Keogh, Justin W. L.
Affiliation: University of Abertay Dundee. School of Social & Health Sciences
Keywords: Jumping
Issue Date: Apr-2012
Publisher: Lippincott, Williams & Wilkins/National Strength and Conditioning Association
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Lippincott, Williams & Wilkins/National Strength and Conditioning Association, available from http://dx.doi.org/10.1519/JSC.0b013e31822e589e
Citation: Swinton, P.A., et al. 2012. Effect of load positioning on the kinematics and kinetics of weighted vertical jumps. Journal of Strength & Conditioning Research. 26(4): pp.906-913. Available from http://dx.doi.org/10.1519/JSC.0b013e31822e589e
Abstract: One of the most popular exercises for developing lower-body muscular power is the weighted vertical jump. The present study sought to examine the effect of altering the position of the external load on the kinematics and kinetics of the movement. Twenty-nine resistance-trained rugby union athletes performed maximal effort jumps with 0, 20, 40, and 60% of their squat 1 repetition maximum (1RM) with the load positioned (a) on the posterior aspect of the shoulder using a straight barbell and (b) at arms' length using a hexagonal barbell. Kinematic and kinetic variables were calculated through integration of the vertical ground reaction force data using a forward dynamics approach. Performance of the hexagonal barbell jump resulted in significantly (p < 0.05) greater values for jump height, peak force, peak power, and peak rate of force development compared with the straight barbell jump. Significantly (p < 0.05) greater peak power was produced during the unloaded jump compared with all trials where the external load was positioned on the shoulder. In contrast, significantly (p < 0.05) greater peak power was produced when using the hexagonal barbell combined with a load of 20% 1RM compared with all other conditions investigated. The results suggest that weighted vertical jumps should be performed with the external load positioned at arms' length rather than on the shoulder when attempting to improve lower-body muscular performance.
URI: http://hdl.handle.net/10373/1236
ISSN: 1064-8011
Appears in Collections:Social & Health Sciences Collection

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