TY  - JOUR
A1  - Voelzke, Mathias
A1  - Stutzig, Norman
A1  - Thorhauer, Hans-Alexander
A1  - Granacher, Urs
T1  - Promoting lower extremity strength in elite volleyball players: Effects
 of two combined training methods
JF  - JOURNAL OF SCIENCE AND MEDICINE IN SPORT
N2  - Objectives: To compare the impact of short term training with resistance plus plyometric training (RT+P) or electromyostimulation plus plyometric training (EMS+P) on explosive force production in elite volleyball players. Design: Sixteen elite volleyball players of the first German division participated in a training study. Methods: The participants were randomly assigned to either the RT+P training group (n = 8) or the EMS+P training group (n= 8). Both groups participated in a 5-week lower extremity exercise program. Pre and post tests included squat jumps (Si), countermovement jumps (CMJ), and drop jumps (DJ) on a force plate. The three-step reach height (RH) was assessed using a custom-made vertec apparatus. Fifteen m straight and lateral sprint (S15s and S15l) were assessed using photoelectric cells with interims at 5 m and 10 m. Results: RT+P training resulted in significant improvements in Si (+2.3%) and RH (+0.4%) performance. The EMS+P training group showed significant increases in performance of CMJ (+3.8%), DJ (+6.4%), RH (+1.6%), S15l (-3.8%) and after 5 m and 10 m of the S15s (-2.6%; -0.5%). The comparison of training-induced changes between the two intervention groups revealed significant differences for the Si (p = 0.023) in favor of RT+P and for the S15s after 5 m (p = 0.006) in favor of EMS+P. Conclusions: The results indicate that RT+P training is effective in promoting jump performances and EMS+P training increases jump, speed and agility performances of elite volleyball players. (c) 2012 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
KW  - Muscle contraction
KW  - Quadriceps muscle
KW  - Explosive force production
KW  - Exercise
KW  - Electric stimulation
KW  - Plyometrics
Y1  - 2012
U6  - https://doi.org/10.1016/j.jsams.2012.02.004
SN  - 1440-2440
VL  - 15
IS  - 5
SP  - 457
EP  - 462
PB  - ELSEVIER SCI LTD
CY  - OXFORD
ER  -