A comparative study on the match performance of the Chinese Super League before and after COVID-19.

The study investigated the impact of empty stadium matches and rule changes due to COVID-19 on the match performance in the Chinese Super League (CSL), including both technical and physical performance. Technical indicators considered were passing accuracy, number of passes, and number of challenges, while physical indicators included total distance, average speed, number of sprints, and sprint distance. Statistical significance was accepted at p < 0.001. The results showed that empty stadium matches led to a significant decrease in passing accuracy, while the number of passes and challenges increased. The changes in rules indicated a significant decline in players' total running distance, average speed, number of sprints, and sprint distance compared to pre-pandemic levels, although the average distance of high-speed runs increased. The pandemic had a more pronounced impact on players' physical performance. Coaches can use this information to adjust training plans for players during special periods to mitigate adverse effects on physical performance.