Naslov
Vertical- vs. horizontal-oriented drop-jump training: chronic effects on explosive performances of elite handball players

Autori
Dell Iacono, Antonio ; Marcone, Domenico ; Milić, Mirjana ; Padulo, Johnny

Izvornik
Journal of strength and conditioning research (1064-8011) 31 (2017), 4; 921-931

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
plyometrics – neuromuscular abilities – sprint – agility – team sport

Sažetak
This study aimed to assess the chronic effects of vertical and horizontal drop-jump-based protocols on neuromuscular explosive abilities such as jumping, sprinting, and change of direction (COD). Eighteen elite male handball players (age 23.4 +/- 4.6 years ; height 192.5 +/- 3.7 cm ; weight 87.8 +/- 7.4 kg) were assigned to either vertical drop jump (VDJ) or horizontal drop jump (HDJ) group training twice a week for 10 weeks. Participants performed 5-8 sets x 6-10 repetitions of vertical-alternate (VDJ) or horizontal-alternate (HDJ) one-leg drop-jumps, landing from the top of a platform 25 cm in height. Before and after training, several performance, kinetic and kinematic variables were assessed. The HDJ led to greater improvement of the sprint-time (-8.5% vs. -4% ; p<0.05) and COD performance in comparison with the VDJ (-7.9% vs. -1.1% ; p<0.05), while the VDJ caused greater improvement in the vertical jump compared with the HDJ (+8.6% vs. +4.1% ; p<0.05). Moreover, the VDJ regimen compared with the HDJ, induced greater changes in the kinetic variables associated with vertical jumping performance, such as peak ground reaction forces (+10.3% vs. +4.3%), relative impulse (+12.4% vs. +5.7%), leg- spring stiffness (+17.6% vs. +4.6%), contact time (-10.1% vs. -1.5%), and reactive strength index (+7.2% vs. +2.1%) ; all comparisons with p<0.05. Conversely, the HDJ regimen was able to improve the short-distance and COD performances by increasing the step length (+3.5% vs. +1.5% with p<0.05) and reducing the contact time on COD (-12.1% vs. -2.1% with p<0.05) more than the VDJ. This investigation showed the crucial role that specific plyometric regimens play in optimizing similar biomechanical featured functional performances such as jumping, sprinting and COD.

Izvorni jezik
Engleski

Znanstvena područja
Kineziologija

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