Comparison of the players’ characteristics, football exposure and HMI history of the players between the two seasons
| Variables | Control season (2019) | Intervention season (2021) | P value |
| No of players | 90 | 87 | |
| Anthropometry (mean (SD)) | |||
| Age | 25.9 (5.0) | 25.3 (5.2) | 0.409 |
| Height | 1.80 (0.07) | 1.81 (0.07) | 0.550 |
| Body mass | 77.1 (6.8) | 76.4 (7.3) | 0.509 |
| History of HMI (n (%)) | 0.405 | ||
| Yes | 19 (21.1) | 23 (26.4) | |
| No | 71 (78.9) | 64 (73.6) | |
| Team (n (%)) | 0.995 | ||
| Team 1 | 20 (22.2) | 18 (20.7) | |
| Team 2 | 17 (18.9) | 18 (20.7) | |
| Team 3 | 16 (17.8) | 14 (16.1) | |
| Team 4 | 17 (18.9) | 17 (19.5) | |
| Team 5 | 20 (22.2) | 20 (23.0) | |
| Position (n (%)) | 0.605 | ||
| Defender | 35 (38.9) | 34 (39.1) | |
| Midfielder | 29 (32.2) | 33 (37.9) | |
| Forward | 26 (28.9) | 20 (23.0) | |
| Exposure (hours) (mean (SD)) | |||
| Total | 353.2 (39.4) | 364.4 (49.9) | 0.011 |
| Match | 26.4 (14.8) | 28.1 (14.9) | 0.432 |
| Training | 326.8 (33.4) | 336.3 (44.6) | 0.009 |
| Exposure (hours) (sum) | |||
| Total | 31 789 | 31 706 | |
| Match | 2374 | 2447 | |
| Training | 29 415 | 29 258 |
HMI, hamstring muscle injury.