The aim of this study was to investigate whether supplementing regular pre-season futsal training with weekly sessions of repeated sprints (RS) training would have positive effects on repeated sprint ability (RSA) and field test performance. Thirteen players from a professional futsal team (22.6 +/- 6.7 years, 72.8 +/- 8.7 kg, 173.2 +/- 6.2 cm) were divided randomly into two groups (AddT: n=6 and NormT: n=7). Both groups performed a RSA test, Yo-Yo intermittent recovery test level 1 (YoYo IR1), squat (SJ) and countermovement jumps (CMJ), body composition and heart rate variability (HRV) measures at rest before and after 4 weeks of pre-season training. Athletes weekly stress symptoms were recorded by psychometric responses using the DALDA questionnaire and subjective ratings of well-being scale (SRWB), respectively. The daily training load (arbitrary units, a.u.) was assessed using the session of rating perceived exertion (session-RPE) method. Following the pre-season training, there were no significant changes for body composition, SJ, CMJ and RSAbest. The YoYo IR1, RSAmean, RSAworst and RSAdecreament were significantly improved for both groups (P<0.05). The HRV parameters improved significantly within both groups (P<0.05) except for high frequency (HF, absolute and normalised units, n.u.), low frequency (LF) (n.u.) and the LF/HF ratio. A moderate effect size for the AddT group was observed for resting heart rate and several HRV measures). Training load and psychometric responses were similar between both groups. Additional RS training resulted in slightly greater positive changes for vagal-related HRV with similar improvements in performance and training stress during the pre-season training in futsal players.
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