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Article type: Research Article
Authors: Salci, Yasara | Yildirim, Ahmetb | Celik, Ozgurb | Ak, Emreb | Kocak, Settarb | Korkusuz, Fezab; c
Affiliations: [a] School of Physical Education and Sports, Mustafa Kemal University, Hatay, Turkey | [b] Department of Physical Education and Sports, Faculty of Education, Middle East Technical University, Ankara, Turkey | [c] Middle East Technical University, Medical Center, Ankara, Turkey
Note: [] Corresponding author: Yasar Salci, Mustafa Kemal University, Campus of Tayfur Sokmen, The School of Physical Education and Sports, Hatay, Turkey. Tel.: +90 326 2455205/5057; Fax: +90 326 2455216; E-mail: [email protected]
Abstract: Hamstring training involving eccentric loading is an important protective factor in hamstring injuries. However, the effect of this mode of training on lower extremity loading in landing maneuver performance is unknown. The purpose of this study was to examine variations in eccentric hamstring strength after 10-weeks training program and the possible changes in landing kinetics. Twenty five recreational female athletes were voluntarily assigned to the Nordic Hamstraing Strength Training (N=13) or control groups (N=12). The training group performed 10-weeks eccentric hamstring strength training program. Baseline measures of landing kinetics were collected using a force plate while strength data was evaluated using an isokinetic dynamometer. Results indicated that NHST group increased their eccentric hamstring strength (pre=2.34 ± 0.28, post=2.57 ± 0.25 Nm/kgbw; p < 0.05) after training program albeit without changes in the dynamic control ratio. There were also significant decreases in peak anterior-posterior ground reaction force (PAPGRF; pre=1.14 ± 0.21 BW, post=0.85 ± 0.27 BW; p< 0.05) and peak vertical ground reaction force (PVGRF; pre=6.27 ± 1.00 BW, post=5.34 ± 1.01 BW; p < 0.05) scores for NHST group. The present study supports the positive effect of eccentric hamstring strength in altering landing kinetics in order to decrease the applied forces.
Keywords: Isokinetic strength, eccentric training, kinetics
DOI: 10.3233/IES-2012-0466
Journal: Isokinetics and Exercise Science, vol. 21, no. 1, pp. 11-18, 2013
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