The acute effects of accentuated eccentric loading on drop jump kinetics in adolescent athletes
Lloyd, Rhodri S.
Lippincott, Williams and Wilkins
MetadataShow full item record
The purpose of the study was to determine the acute effects of accentuated eccentric loading (AEL) on drop jump kinetics in adolescent athletes. Fifteen male rugby players (mean sd: age = 16.2 ± 1.01, weight = 73.38 ± 9.94 and height = 178.91 ± 6.74) completed three trials of a drop jump with and without an accentuated eccentric load using a dumbbell release technique that equated to 15% body mass. The addition of the AEL stimulus resulted in significant, moderate increases in jump height (p < 0.05; Wilcoxon r = 0.47) and braking and propulsive impulse (p < 0.05, Hedges’ g = 0.43; p < 0.05, g = 0.61 respectively) but did not significantly influence reactive strength index. Concurrently, there were significant, moderate increases in ground contact times (p < 0.05; r = 0.45) and reductions in spring-like correlations (p < 0.05; g = 0.94). Neither the magnitude or timing of peak landing force were significantly altered in the AEL protocol (p < 0.05, g = 0.38; p < 0.05, r = 0.10 respectively). Cumulatively, these data indicate that implementation of AEL resulted in meaningful improvements in jump height, driven by significant increases in braking and propulsive impulse. Despite extensions in ground contact times and reductions in spring-like behavior, neither peak landing force or time to peak force were negatively altered by the AEL. These results indicate that adolescent athletes can realize superior vertical jump heights during drop jumps using AEL, without displaying marked changes in the magnitude or timing of peak landing force
Journal of Strength and Conditioning Research;
Article accepted for publication in Journal of Strength and Conditioning Research
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
- Sport Research Groups 
Showing items related by title, author, subject and abstract.
Derah, Bakhit (Cardiff Metropolitan University, 2020)This research aimed to investigate the impact of enterprise risk management (ERM) on the organizational performance of oil companies in Qatar. The study uses two case studies of ORYX GTL and Qatar Petroleum in investigating ...
Richards, Justine Bess (Cardiff Metropolitan University, 2013)Introduction: Neurolinguistic programming (NLP) is a psychological paradigm in use in many professional fields, including speech and language therapy. One aspect of this theory is the eye accessing cues (EAC) model which ...
Hazell, Christopher (Cardiff Metropolitan University, 2001)Aims: The project is designed to investigate the effects of exposure to airborne pollution on cardiovascular health. Many studies have identified an association between exposure to elevated levels of airborne pollution and ...