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Effects of Offence-defense Transition Time on Physical Loads in Small-sided Football Matches
CHEN Xiaohu, LI Chunman, HUANG Zhuhang, ZHUO Jinyuan, HUANG Xiaoling
2023, 49 (4):
85-90.
doi: 10.15942/j.jcsu.2023.04.012
Objective: Using offense-defense transition time as a control factor to compare the physical load performance of elite youth football players in small-sided matches so as to provide reference for coaches to realize the goal of "training for matches". Methods: Twelve elite youth football players were selected as subjects to attend "one-on-one match with a goalkeeper" in 2 forms: unlimited transition time and limited transition time (shooting the goal within 12s and winning back possession within 3s), the percentage of different heart rate intervals, average heart rate, total training load, blood lactate, total running distance, high, middle and low intensity running distance, number of high intensity running, number of changing direction were collected in real time. Results: During unlimited transition time, the average heart rate of the players was 87% HRmax, and was concentrated in 80%~89% HRmax for 38.67% of the time, and the blood lactate value was 11.53 mmol/L; the players mainly ran in medium intensity, the running distance was 31.63 m/min, and the running load was close to that of Qatar 2020 World Cup. During limited transition time, the average heart rate of the players was 91% HRmax, and the heart rate was concentrated in 90%-95% HRmax for 38.26% of the time, and the blood lactate value was 21.67 mmol/L; players ran mainly in high-intensity, the running distance was 33.82 m/min, and their total distance, high-intensity running distance and the ratio of high-intensity running were higher than those of 2022 Qatar World Cup. Conclusion: Coaches can effectively control the offense-defense transition time by limiting the time of goal shooting and winning back possessions, thus improving the intensity of training load and the efficiency of players' load use, which is conducive to the development of players' anaerobic generative ability.
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