Effect Of a Typical Pre-season On Neuromuscular Parameters In Brazilian Futsal Players

Neuromuscular parameters could be altered during the game. However, some studies showed may be modulated according to the period, load and intensity of training. Based this, the aim of present study was to describe the effects of 3 weeks pre-season training period on neuromuscular parameters in Brazilian futsal players. Eleven Brazilian professional futsal players (age 22.5±5.2 years) were monitored during 3 weeks of the typical pre-season. For neuromuscular assessment was performed three maximal voluntary isometric contractions (MVC) knee extension of 5s with passive recovery between the series of 1min. All MVC were performed in sitting position with the hip and knee of the dominant limb flexed at 80° and 90° respectively and were monitored the force through of load cell and the electromyography (EMG) activity of vastus lateralis from surface electrodes to determine the value of maximum force of isometric contraction (MF), rate of force development 0-50ms (RFD) force impulse (FI) and neuromuscular activation profile (RMS and Mean power frequency - MPF). The weekly training load was assessed using rating of perceived exertion (RPE) and calculation of the training impulse (Trimp). The t-student test and one-way ANOVA was used to compare the results between the weeks. The weekly mean volume were 480, 720 and 860min and the mean RPE were 5.2±0.3a.u 7.2±0.6a.u. and 6.9±0.7a.u. respectively each week. Trimp average was increased (p<0.05) during the period (309.3±16.0a.u.; 436.4±37.7a.u; 498.3±53.8a.u. respectively). MF (pre: 68.7±14.2Kgf; post: 65.5±16.0Kgf), RFD (pre: 0.11±0.03kg.m.s-1; post: 0.08±0.03 kg.m.s-1) and FI (pre: 307.31±64.37Kgf; post: 292.66±71.17Kgf) had a percentage decrease of 1.6±30.3%, 18.6±33.81% and 1.5±30.65% respectively. Although, the RMS and MPF had a percentage increase of 9.8±35.7% and 6.8±23.6%. Despite the not significant, a pre-season with high Trimp may affect negatively the force and lead an increase in the RMS and MPF in the vastus lateralis. Based this results, and since the pre-season is the previous period of the competitive season, it seems the workload of pre-season for futsal players may affect the neuromuscular parameters and lead a decrease in the force in the beginning of the competitive season.

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