Abstract
BackgroundThis study addressed the lack of data on the effect of warm-up (WU) duration in hot-dry climate (~ 30 °C; ~ 18% RH), on thermoregulation, muscular power-output, and fatigue after specific soccer repeated-sprint test (RSA).MethodsEleven amateur soccer players participated in a cross-over randomized study and they underwent the Bangsbo repeated-sprint test, after three WU durations (i.e. WU10, WU15 and WU20 min) at 70% of MAV, and on different days. Peak power (PP), mean power (MP) and the fatigue index (FI) were recorded and analyzed. Likewise, heart rate (HR), tympanic temperature (Ttym), mean body temperature (MBT) and rating of perceived exertion (RPE) were recorded during each session.ResultsThe repeated measure ANOVA showed that MP improved after WU15 in comparison to WU10 and WU20 (p = 0.04 and p = 0.001; respectively). Nonetheless, no significant effect on PP was recorded after all WU durations. FI during RSA increased after WU20 in comparison to WU15 and WU10 (p < 0.001 and p = 0.003; respectively). Higher RPE values (p < 0.001) were recorded after WU15 and WU20 in comparison to WU10 duration. The two-way ANOVA showed higher ΔTtym and ΔMBT values after WU15 and WU20 compared to WU10 (p = 0.039 and p < 0.001for Ttym; p = 0.005 and p < 0.001 for MBT, respectively).ConclusionsThe WU15 at 70% of MAV better assists mean power-output during soccer RSA in hot-dry (~ 30 °C; 18% RH) climate, but not peak power. Reducing WU duration up to 10 min seems to be insufficient to induce beneficial physiological changes necessary for optimizing repeated-sprint performance, while its extension up to 20 min remains detrimental for muscular power and induces higher fatigue.
Highlights
This study addressed the lack of data on the effect of warm-up (WU) duration in hot-dry climate (~ 30 °C; ~ 18% RH), on thermoregulation, muscular power-output, and fatigue after specific soccer repeated-sprint test (RSA)
The post hoc analyzes showed: (i) compared to WU10, the WU15 leads to higher power-output recorded in all sprint repetitions, except the 2nd and the 5th one (p = 0.103 and p = 0.051, respectively), (ii) compared to WU20, the WU10 leads to higher power production during the 4th, 5th, 6th and 7th repetitions (p < 0.001 for all comparisons), but not for the 1st, 2nd and 3rd test repetitions (p = 0.229; p = 0.053 and p = 0.087 respectively; Fig. 2)
Concerning Peak power (PP), the one-way ANOVA indicated that the main effect of WU durations was not significant (F = 1.028; p = 0.376)
Summary
This study addressed the lack of data on the effect of warm-up (WU) duration in hot-dry climate (~ 30 °C; ~ 18% RH), on thermoregulation, muscular power-output, and fatigue after specific soccer repeated-sprint test (RSA). There is a lack of data related to the effects of warm-up in hot climate on sprint performance [2] and, especially, on soccer RSA. This ability, characterized by the production of maximal short sprint bouts, with brief recovery in between not exceeding 60s [7], corresponds to an essential physical component in soccer competitions [8]
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