engleski

The role of muscle fatigue on knee biomechanics during single leg landings

The purpose of this research was to determine the role of the lower extremity muscle fatigue on the knee biomechanics and proprioceptive sensitivity during single leg landings. Following kinematic variables were studied: valgus and varus angle, angle of the inner and outer rotation as well as the angle of the flexion and extension in the knee joint and ground reaction force (GRF). The original EMG signals m. vastus medialis, m. vastus lateralis, m. biceps femoris and m. gastrocnemius, have been measured during execution of the maximum static contraction lasting for 10 seconds, with the aid of an dynamo-metric bench, and used for assessment of the fatigue by spectral analysis. Statistically significant drop in correlation coefficient of the kinematic parameters, within the experimental group after fatiguing, is particularly expressed in inner and outer rotation angle as well as valgus-varus movement of both legs, what points at a motor deficit i.e. decrease of the proprioceptive senses caused by musculature fatigue. The analysis of the GRF signal also shows statistically significant differences between groups at almost all components, excluding component in direction front - back. This research showed a significant influence of the fatigue on the proprioceptive sensitivity and the motor control in knee joint.

muscle fatigue; knee biomechanics; landings

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