This study investigated the effect of halftime re-warm up (RW) with intermittent exercise on the subsequent exercise performance of soccer referees, determined by the Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1). Using a randomized crossover design, ten male referees were required to complete two trials. The trials consisted of the Loughborough Intermittent Shuttle Test, halftime, and Yo-Yo IR1 periods. During halftime, participants either rested on a chair (Control) or performed a halftime RW exercise for 15 min. The halftime RW protocol comprised 2.15 min of seated rest, followed by 2.15 min of running at 70% of the maximum heart rate (HRmax) - this cycle of recovery and running was repeated for a total of 13 min. The halftime RW protocol started at 1 min after the commencement of the halftime period and concluded 1 min before its end. The Yo-Yo IR1 performance, blood glucose, free fatty acids (FFA), triglycerides (TG), creatine kinase (CK), and lactate concentrations, the rating of perceived exertion (RPE), mean HR, and HRmax were analyzed. The Yo-Yo IR1 performance was higher in the halftime RW trial than in the control trial (3,095 +/- 326 vs 2,904 +/- 421 m, P < 0.05). The mean HR and HRmax, blood glucose, FFA, TG, CK, and lactate concentrations did not differ between the trials. The rating of perceived exertion during the halftime RW, but not after the Yo-Yo IR1 period, was higher than that in the control trial. In conclusion, the present study showed that halftime RW with intermittent exercise improves subsequent exercise performance.
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