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Archive > Year 2011, Number 4

A stretch-shorten cycle protocol affects running biomechanics and alters movement patterns


Authors

Lazaridis Savvas, Faculty of Physical Education and Sport Science, Aristotelio University of Thessaloniki

Abstract

The purpose of the current study was to examine the acute knee biomechanics alterations occurring as the result of a stretch-shortening cycle fatigue protocol during treadmill running (2.8 m/s). Twelve untrained adults were submitted to a protocol of plyometric jumps (10 sets x 10 repetitions, 30’ interval). Eccentric torque of knee extensor muscles (1.05 rad/s), sagittal plane knee kinematics data during running on a treadmill, and the electromyogram (EMG) of the biceps femoris (BF) muscle were collected and assessed pre- and post-protocol (0 h). Repeated measures one-way ANOVA with two levels were used as the parameters. Eccentric torque declined almost ~24% 0h post-protocol. 3D kinematic analysis revealed that the knee joint was more flexed at the initial contact whereas the knee range of motion (ROM) during stance and swing phases of running decreased. These alterations were accompanied by corresponding increments of BF EMG amplitudes during preactivation and swing phases of running respectively as compared to the pre-exercise values. Acute fatigue (0 h) possibly activates the central nervous system to alter the pattern of knee muscle activation as a self-protection mechanism against the running loads. The above caused the participants to adopt a different strategy of running in order to protect their musculature during contact and thus ensure stability.

Keywords

Running biomechanics, 3D kinematics, electromyography, plyometric exercise

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