Effect of Fatigue in Different Periods of Simulated Match Protocol on Selected Kinematic Variables and Electromyography of Futsal Players' Lower Limb

The aim of the present study was to investige the effect of fatigue on different periods of FIRP on the selected kinematic parameters and electromyography of selected muscles of futsal players. In the current quasi-experimental study, 12 semi-professional futsal players with no injury of muscle skeletal disorders participated. MyoMotion (with sampling rate of 200 Hz) Noraxon System was used for measuring kinematic parameters and MyoMuscle (with sampling rate of 1000 Hz) Noraxon System was used for measuring muscle activity. All participants did 10 meters sprint test for three times: before, during, and after FIRP. Simultaneously, kinematical and electromyography variables were measured. In the data analysis, procedures continuum relative phase and area under the curve of RMS moving average in four phases, and with 25% interval, during running were calculated. ANOVA with repeated measures and Bonferonni post hoc test were used to examine the differences between effects of fatigue in different situations (P≤0.05). The results showed that there are significant differences between Sagittal hip and knee coordination in phase three (before and while fatigue), between Sagittal knee and ankle joint coordination in each four phases, and between sagittal hip and ankle in phase two and four (before, during, and after fatigue) (P<0.05). The results also showed that there are significance differences between gastrocnemius in phase three and Biceps Femoris in phase three before and after fatigue protocol (P<0.05). Generally, it seems that futsal specific fatigue protocol could considerably affect lower limb muscles and joints interaction in the Sagittal plane; however, its effect on the knee joints and muscles, especially Hamstring, were much higher after fatigue. It is suggested that the strength and conditioning coaches concentrate more on muscle endurance training, especially on Hamstring muscle, and Gastrocnemius to reduce the effect of fatigue on performance and risk of injuries.