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RESEARCH PRODUCT

Electrostimulation Training Effects on the Physical Performance of Ice Hockey Players

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BROCHERIE, F., N. BABAULT, G. COMETTI, N. MAFFIULETTI, and J.-C. CHATARD. Electrostimulation Training Effects on the Physical Performance of Ice Hockey Players. Med. Sci. Sports Exerc., Vol. 37, No. 3, pp. 455–460, 2005. Purpose: The aim of this study was to examine the influence of a short-term electromyostimulation (EMS) training program on the strength of knee extensors, skating, and vertical jump performance of a group of ice hockey players. Methods: Seventeen ice hockey players participated in this study, with nine in the electrostimulated group (ES) and the remaining height as controls (C). EMS sessions consisted of 30 contractions (4-s duration, 85 Hz) and were carried out 3 wk 1 for 3 wk. Isokinetic strength of the knee extensor muscles was determined with a Biodex dynamometer at different eccentric and concentric angular velocities (angular velocities ranging from 120 to 300°·s 1 ). Jumping ability was evaluated during squat jump (SJ), countermovement jump (CMJ), drop jump (DJ), and 15 consecutive CMJ (15J). Sprint times for 10- and 30-m skates in specific conditions were measured using an infrared photoelectric system. Results: After 3 wk of EMS training, isokinetic torque increased significantly (P 0.05) for ES group in eccentric (120 and 60°·s 1 ) and concentric conditions (60 and 300°·s 1 ), whereas vertical jump height decreased significantly (P 0.05) for SJ (2.9 2.4 cm), CMJ (2.1 2.0 cm), and DJ (1.3 1.1 cm). The 10-m skating performance was significantly improved (from 2.18 0.20 to 2.07 0.09 s, before and after the 3-wk EMS period, respectively; P 0.05). Conclusion: It was demonstrated that an EMS program of the knee extensors significantly enhanced isokinetic strength (eccentric and for two concentric velocities) and short skating performance of a group of ice hockey players. Key Words: KNEE EXTENSORS, STRENGTH TRAINING, SPRINT, VERTICAL JUMP