Operational definitions
| Training session | Team training that involved physical activity under the supervision of the coaching staff |
| Match | Competitive or friendly match against another team. |
| Injury | Any physical complaint sustained by a player that resulted from a football match or football training led to the player being unable to participate in future football training or match play. |
| Ligament injury | Traumatic distraction injury to a ligament. |
| Muscle injury | Traumatic distraction or overuse injury to a muscle. |
| Injury incidence | The number of injuries per 1000 player hours ((Σ injuries/Σ exposure hours)×1000). |
| Injury burden | The number of lay-off days per 1000 player hours ((Σ lay-off days/Σ exposure hours)×1000). |