Hamstring injury (HSI) characteristics across the 13-year study period in men's professional football season
| 2001/2002 | 2002/2003 | 2003/2004 | 2004/2005 | 2005/2006 | 2006/2007 | 2007/2008 | 2008/2009 | 2009/2010 | 2010/2011 | 2011/2012 | 2012/2013 | 2013/2014 | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HSI, n | 75 | 54 | 66 | 55 | 118 | 138 | 91 | 125 | 140 | 168 | 183 | 182 | 219 | 1614 |
| Training, n | 22 | 16 | 25 | 16 | 40 | 49 | 29 | 44 | 58 | 66 | 54 | 75 | 78 | 572 |
| Match play, n | 53 | 38 | 41 | 39 | 78 | 89 | 62 | 81 | 82 | 102 | 129 | 107 | 141 | 1042 |
| Players with HSI, n (%) | 53 (21) | 35 (17) | 49 (21) | 38 (18) | 87 (22) | 100 (26) | 72 (20) | 83 (23) | 105 (23) | 125 (24) | 127 (23) | 126 (22) | 163 (23) | 1163 (22) |
| Total HSI rate/1000 h | 1.1 | 0.9 | 1.1 | 1.0 | 1.2 | 1.3 | 1.0 | 1.3 | 1.2 | 1.3 | 1.3 | 1.3 | 1.2 | 1.20 |
| Training HSI rate/1000 h | 0.4 | 0.3 | 0.5 | 0.3 | 0.5 | 0.6 | 0.4 | 0.6 | 0.6 | 0.6 | 0.5 | 0.6 | 0.5 | 0.51 |
| Match HSI rate/1000 h | 4.6 | 3.9 | 4.0 | 4.1 | 4.8 | 5.5 | 4.2 | 5.4 | 4.4 | 4.8 | 5.8 | 4.6 | 4.8 | 4.77 |
| Recurrences, n (%) | 7 (9) | 8 (15) | 10 (15) | 10 (18) | 15 (13) | 11 (8) | 12 (13) | 24 (19) | 16 (11) | 22 (13) | 28 (15) | 25 (14) | 28 (13) | 216 (13) |
| HSI severity, n (%) (days) | ||||||||||||||
| 0–3 | 10 (13) | 5 (9) | 3 (5) | 5 (9) | 16 (14) | 16 (12) | 16 (18) | 10 (8) | 14 (10) | 18 (11) | 14 (8) | 13 (7) | 23 (11) | 163 (10) |
| 4–7 | 22 (29) | 15 (28) | 13 (20) | 19 (35) | 25 (21) | 24 (17) | 13 (14) | 27 (22) | 31 (22) | 25 (15) | 32 (18) | 33 (18) | 60 (27) | 339 (21) |
| 8–28 | 35 (47) | 28 (52) | 42 (64) | 28 (51) | 58 (49) | 73 (53) | 47 (52) | 76 (61) | 79 (56) | 100 (60) | 100 (55) | 108 (59) | 102 (47) | 876 (54) |
| >28 | 8 (11) | 6 (11) | 8 (12) | 3 (6) | 19 (16) | 25 (18) | 15 (17) | 12 (10) | 16 (11) | 25 (15) | 37 (20) | 28 (15) | 35 (16) | 236 (15) |
| Absence days, mean (SD) | 15.7 (21.2) | 15.5 (14.2) | 16.3 (11.8) | 12.2 (19.4) | 16.6 (18.9) | 18.2 (18.8) | 17.1 (16.4) | 15.7 (13.9) | 15.3 (12.7) | 17.6 (19.8) | 21.9 (34.9) | 16.9 (16.7) | 18.0 (26.7) | 17.3 (21.1) |
| Total HSI burden† | 17.3 | 13.7 | 17.6 | 11.7 | 19.4 | 24.3 | 16.8 | 20.7 | 18.1 | 23.1 | 29.1 | 22.0 | 21.6 | 19.7 |
| Training HSI burden† | 2.9 | 3.7 | 7.3 | 4.0 | 5.2 | 6.7 | 6.2 | 7.4 | 7.0 | 8.6 | 7.4 | 9.9 | 5.5 | 6.3 |
| Match HSI burden† | 88.8 | 65.6 | 68.8 | 51.0 | 92.3 | 118.3 | 71.9 | 92.0 | 76.9 | 96.5 | 141.1 | 82.0 | 105.3 | 88.5 |
†Burden denotes number of injury days absence/1000 h (mean absence×injury rate).