Effect of load positioning on the kinematics and kinetics of weighted vertical jumps

Paul A. Swinton, Arthur D. Stewart, Ray Lloyd, Ioannis Agouris, Justin W. L. Keogh

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)906–913
Number of pages8
JournalJournal of Strength & Conditioning Research
Volume26
Issue number4
DOIs
StatePublished - Apr 2012

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Biomechanical Phenomena
Football
Athletes
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Swinton, P. A., Stewart, A. D., Lloyd, R., Agouris, I., & Keogh, J. W. L. (2012). Effect of load positioning on the kinematics and kinetics of weighted vertical jumps. Journal of Strength & Conditioning Research, 26(4), 906–913. DOI: 10.1519/JSC.0b013e31822e589e

Swinton, Paul A.; Stewart, Arthur D.; Lloyd, Ray; Agouris, Ioannis; Keogh, Justin W. L. / Effect of load positioning on the kinematics and kinetics of weighted vertical jumps.

In: Journal of Strength & Conditioning Research, Vol. 26, No. 4, 04.2012, p. 906–913.

Research output: Contribution to journalArticle

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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.",
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Swinton, PA, Stewart, AD, Lloyd, R, Agouris, I & Keogh, JWL 2012, 'Effect of load positioning on the kinematics and kinetics of weighted vertical jumps' Journal of Strength & Conditioning Research, vol 26, no. 4, pp. 906–913. DOI: 10.1519/JSC.0b013e31822e589e

Effect of load positioning on the kinematics and kinetics of weighted vertical jumps. / Swinton, Paul A.; Stewart, Arthur D.; Lloyd, Ray; Agouris, Ioannis; Keogh, Justin W. L.

In: Journal of Strength & Conditioning Research, Vol. 26, No. 4, 04.2012, p. 906–913.

Research output: Contribution to journalArticle

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Swinton PA, Stewart AD, Lloyd R, Agouris I, Keogh JWL. Effect of load positioning on the kinematics and kinetics of weighted vertical jumps. Journal of Strength & Conditioning Research. 2012 Apr;26(4):906–913. Available from, DOI: 10.1519/JSC.0b013e31822e589e