Technique factors related to ball release speed and trunk injuries in high performance cricket fast bowlers.

In this study we analysed technique, ball speed and trunk injury data collected at the Australian Institute of Sport (AIS) from 42 high performance male fast bowlers over a four year period. We found several notable technique inter-relationships, technique and ball speed relationships, and associations between technique and trunk injuries. A more front-on shoulder alignment at back foot contact was significantly related to increased shoulder counter-rotation (p < 0.001). Bowlers who released the ball at greater speeds had an extended front knee, or extended their front knee, during the front foot contact phase (p < 0.05). They also recorded higher braking and vertical impact forces during the front foot contact phase and developed those forces more rapidly (p < or =0.05). A maximum hip-shoulder separation angle occurring later in the delivery stride (p = 0.05) and a larger shoulder rotation to ball release (p = 0.05) were also characteristics of faster bowlers. Bowlers suffering lower back injuries exhibited typical characteristics of the 'mixed' technique. Specifically, the hip to shoulder separation angle at back foot contact was greater in bowlers who reported soft tissue injuries than in non trunk-injured bowlers (p = 0.03), and shoulder counter-rotation was significantly higher in bowlers who reported lumbar spine stress fractures than non trunk-injured bowlers (p = 0.01). The stress fracture group was also characterised by a larger hip angle at front foot contact and ball release, whereas a more flexed front knee at ball release characterised the non trunk-injured group.

[1]  R N Marshall,et al.  Thoracolumbar disc degeneration in young fast bowlers in cricket: a follow-up study. , 1996, Clinical biomechanics.

[2]  P. Brukner,et al.  Clinical Sports Medicine , 1993 .

[3]  B. Elliott,et al.  The effect of a fast bowling harness in cricket: an intervention study , 2002, Journal of sports sciences.

[4]  B. Elliott,et al.  Disk degeneration and fast bowling in cricket: an intervention study. , 2002, Medicine and science in sports and exercise.

[5]  Peter J. Sinclair,et al.  Cricket fast bowling performance and technique and the influence of selected physical factors during an 8-over spell , 2000, Journal of sports sciences.

[6]  Roger Bartlett,et al.  A temporal and kinematic comparison of junior and senior international cricket bowlers , 1994 .

[7]  B C Elliott,et al.  The biomechanics of fast bowling in men's cricket: a review. , 1996, Journal of sports sciences.

[8]  B Elliott,et al.  Back injuries to fast bowlers in cricket: a prospective study. , 1989, British journal of sports medicine.

[9]  P. Lachenbruch Statistical Power Analysis for the Behavioral Sciences (2nd ed.) , 1989 .

[10]  Bruce Elliott,et al.  The influence of fast bowling and physical factors on radiologic features in high performance young fast bowlers , 1992 .

[11]  R N Marshall,et al.  The effect of a 12-over spell on fast bowling technique in cricket. , 1995, Journal of sports sciences.

[12]  G J Wilson,et al.  Stretch-shorten cycle compared with isometric preload: contributions to enhanced muscular performance. , 1998, Journal of applied physiology.

[13]  W. Vincent Statistics In Kinesiology , 1994 .

[14]  B C Elliott,et al.  Disc degeneration and the young fast bowler in cricket. , 1993, Clinical biomechanics.

[15]  B. Elliott,et al.  Three-dimensional measurement of lumbar spine kinematics for fast bowlers in cricket. , 1998, Clinical biomechanics.

[16]  R. M. Bartlett,et al.  A KINEMATIC INVESTIGATION OF ELITE FAST AND FAST-MEDIUM CRICKET BOWLERS , 1990 .