The bilateral deficit during jumping tasks: Relationship with speed and change of direction speed performance

Bishop, Chris, Berney, Jake, Lake, Jason P., Loturco, Irineu, Blagrove, Richard, Turner, Anthony and Read, Paul (2019) The bilateral deficit during jumping tasks: Relationship with speed and change of direction speed performance. Journal of Strength and Conditioning Research. ISSN 1064-8011

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Abstract

Research to date has investigated the phenomenon of the bilateral deficit (BLD); however, limited research exists on its association with measures of athletic performance. The purpose of the present study was to investigate the magnitude of the BLD and examine its relationship with linear speed and change of direction speed (CODS) performance. Eighteen physically active and healthy university students performed double and single leg countermovement jumps (CMJ), drop jumps (DJ) and standing broad jumps (SBJ), to calculate the BLD across jump tasks. Subjects also performed 10m and 30m sprints and a 505 CODS test, which were correlated with all BLD metrics. Results showed varying levels of BLD across CMJ metrics (jump height, peak force, eccentric impulse, concentric impulse, peak power), DJ metrics (ground contact time, flight time), and the SBJ (distance). However, a bilateral facilitation (BLF) was shown for jump height and reactive strength index (RSI) during the DJ test. The main findings of the present study were that: 1) a larger BLD in CMJ jump height related to a faster 505 change of direction (COD) (left leg) (r = -0.48; p = 0.04), 505 COD (right leg) (r = -0.53; p = 0.02) and COD deficit (right leg) (r = -0.59; p = 0.01), 2) a larger BLD in CMJ concentric impulse related to faster 505 COD (left leg) (r = -0.51; p = 0.03), 505 COD (right leg) (r = -0.64, p = 0.01) and COD deficit (right leg) (r = -0.60; p = 0.01), 3) a larger BLD in DJ flight time related to a faster 505 COD (left leg) (r = -0.48; p = 0.04). These results suggest that a larger BLD is associated with faster CODS performance, but not linear speed. This highlights the individual nature of the BLD and may support the notion of developing movement competency on one limb for enhanced CODS performance.

Item Type: Article
Additional Information: To access the final edited and published work see https://journals.lww.com/nsca-jscr/Abstract/publishahead/Bilateral_Deficit_During_Jumping_Tasks_.94968.aspx
Uncontrolled Keywords: Fitness testing; sprinting; training implications
Subjects: Q Science > QM Human anatomy
Q Science > QP Physiology
Divisions: Departments > Sport and Exercise Sciences
Depositing User: Jason Lake
Date Deposited: 21 Feb 2019 11:06
Last Modified: 04 Apr 2019 13:48
URI: http://eprints.chi.ac.uk/id/eprint/4183

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