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The relationship between segmental kinematics and ball spin in Type-2 cricket spin bowling
Aaron J Beach1, René E D Ferdinands1, Peter J Sinclair1
1a Exercise and Sport Science, Faculty of Health Sciences , University of Sydney , Sydney , Australia.
Journal of Sports Sciences
|July 28, 2017
Summary
Spin bowling techniques differ between off-spin and leg-spin. Biomechanics research reveals distinct joint kinematics, refuting a one-size-fits-all coaching model for cricket bowlers.
Area of Science:
- Sports Biomechanics
- Cricket Coaching Science
Background:
- Cricket spin bowling techniques often rely on anecdotal evidence rather than scientific validation.
- A generalized coaching model is commonly applied to both off-spin and leg-spin bowlers, lacking biomechanical research support.
Purpose of the Study:
- To investigate the biomechanical differences in joint kinematics between off-spin and leg-spin bowlers.
- To determine the relationship between specific kinematic variables and achieved spin rate in different spin bowling types.
Main Methods:
- Utilized a 3D Cortex motion analysis system to measure 20 off-spin and 15 leg-spin bowlers.
- Analyzed segmental kinematic variables and correlated them with spin rate using correlation coefficients and General Linear Models (GLM).
Main Results:
- Off-spin bowling showed earlier thoracic movement time.
- Leg-spin bowling demonstrated greater magnitude and earlier pelvis rotation, plus increased pelvis-shoulder separation.
- Maximum rear hip flexion velocity distinguished between bowler types. Rear hip flexion velocity (off-spin) and timing of hip flexion/arm circumduction velocity (leg-spin) significantly explained spin rate variance.
Conclusions:
- Significant differences exist in the joint kinematics of off-spin and leg-spin bowlers.
- The findings challenge the conventional "one-size-fits-all" coaching approach, advocating for type-specific technical models.
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