Hot weather and warm-up
The study presented addresses the lack of data on the effects of thermoregulation, muscle output, fatigue, and hot and dry weather (~30°C; ~18% RH) during soccer on warm-up.
Eleven amateur soccer players were
participated in a crossover randomized study and underwent the Bangsbo repeated sprint test on different days after three WU periods (at 70% of MAV).
Peak power (PP), mean power (MP), and fatigue index (FI) were recorded and analyzed, as well as heart rate (HR), tympanic temperature (T tym), mean body temperature (MBT), and rating of perceived exertion (RPE) during each session.
Results.
Repeated measures ANOVA showed an improvement in MP after WU15 compared to WU10 and WU20. Nonetheless, no significant effect on PP was recorded after all WU periods.
FI in RSA increased after WU20 as compared to WU15 and WU10. Higher RPE values were recorded after WU15 and WU20 compared to the WU10 period, and two-way analysis of variance showed higher ΔTtym and ΔMBT values after WU15 and WU20 compared to WU10.
In conclusion, the results showed that warming up for more than 20 minutes did not improve muscle output, and that it was desirable to do more than 10 minutes for average performance, but that fatigue increased with time.
Since this was the situation in an environment with a temperature of 30 degrees Celsius, the results would be different under different temperature conditions, but since the summer environment in Japan has higher temperatures than this, warming up should be done with caution.
Frikha, M., Chaâri, N., Said, N.B. et al. Warm-up durations in a hot-dry climate affect thermoregulation, mean power-output and fatigue, but not peak power in specific soccer repeated-sprint ability. BMC Sports Sci Med Rehabil 12, 76 (2020). Available at: https://doi.org/10.1186/s13102-020-00221-9
Conclusion
The results of this study show that there is no benefit to warming up for more than 15 minutes in hot and dry conditions. Since the situation is fixed, we have to make a difficult decision if we want to use it in practice, but since there is no reason to set more than 15 minutes, it is easy to use in that we can get some indicators.
I don't know if there is such a practice, but I have attended a few games with students, and in addition to the overall warm-up, they also warm up individually, but often the adults were only thinking about the sports performance and not considering the disadvantages such as the decrease in individual fitness.
There are some brainiacs who think that drinking water will help, and so on. As long as we are taking care of other people's children to compete in sports, I think we should pay attention to these details if we want to win the competition.
