Relationship Between Vertical Stiffness And Soft-Tissue Injuries In Professional Australian Football

Soft-tissue injuries are common in Australian football. Recently, literature has identified non-modifiable and modifiable risk factors, including vertical stiffness (K-vert). However, limitations regarding measurement frequency and duration exist; thus, further information is required about the role of K-vert as a modifiable risk factor for injury. This study examined the seasonal variation in K-vert and its relationship to soft-tissue injuries in professional Australian football. The mean K-vert and bilateral asymmetry were assessed and compared between injured and non-injured players. For the seasonal analysis, 56 players were tested across two seasons with no variation in bilateral asymmetry evident (p= 0.33). While there were generally no changes in K-vert, the value from the end of the second pre-season revealed 5% lower values than the mean of two seasons (p= 0.02). Considering the injury analysis, 21 lower-body soft-tissue injuries were recorded from 18 participants. No differences were recorded for mean K-vert between the injured and non-injured groups (p= 0.16-0.76). When assessing K-vert asymmetry, the injured group displayed a 4.5% higher value than the non-injured group at the end of the pre-season test (p= 0.03) but not at other time-points (p= 0.16-0.99). Higher K-vert bilateral asymmetry measures after the pre-season appear to be related to lower-body soft-tissue injury in professional Australian footballers. Medical and conditioning staff should consider this measure when trying to mitigate the onset of injury or identify at-risk players.