Fig. 2
Regression analysis of the relationship between year (x axis) and a total distance, b average speed, c total match time, d time over 18 km·h−1, e number of accelerations greater than 4 km·h−1 in 1 s, and f number of accelerations greater than 10 km·h−1 in 1 s (y axis). n count of accelerations. The size of the circle is representative of the sample size of the data point