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World Archery Coaching Seminar. London, GBR 8 - 11 November 2011. The Biomechanics of Gold Medal Shooting. 9 November 2011. Oliver Logan English Institute of Sport Biomechanist – ArcheryGB EIS Skill Acquisition Lead. 2011 World Archery Coaching Seminar. Note!
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World Archery Coaching Seminar London, GBR 8 - 11 November 2011
The Biomechanics of Gold Medal Shooting 9 November 2011 Oliver Logan English Institute of Sport Biomechanist – ArcheryGB EIS Skill Acquisition Lead
2011 World Archery Coaching Seminar Note! There are many different styles and techniques of shooting. What is presented here is only our thoughts on what works well.
2011 World Archery Coaching Seminar Discussion Areas • The Biomechanics of Archery • Automatic Technique • Skill Acquisition
2011 World Archery Coaching Seminar Posture • Good posture is extremely important for: • Balance • String Clearance • Effective posterior chain use • Shooting mechanics
2011 World Archery Coaching Seminar Posture • An ideal posture would see the centre of gravity of the archer centred between the feet
2011 World Archery Coaching Seminar Good Posture Forward Lean Thoracic/LumbarExtension
2011 World Archery Coaching Seminar Alignment • Proper alignment is important for a robust consistent competition technique • Allows the forces of the bow to be controlled via bones and joints rather than through the muscles • Creates a more consistent repeatable technique that stands up under pressure
2011 World Archery Coaching Seminar Alignment –Coronal Plane
2011 World Archery Coaching Seminar Alignment • 2 types of alignment used in world archery
2011 World Archery Coaching Seminar Alignment Direction of Force Line Energy Stored in Limbs Draw Force
2011 World Archery Coaching Seminar Alignment • This way primarily uses posterior deltoid muscle to draw and upper trapezius to anchor
2011 World Archery Coaching Seminar Alignment Direction of Force Line Energy Stored in Limbs Draw Force
2011 World Archery Coaching Seminar Alignment • This way uses more of the scapular muscles such as all of the Trapezius muscle, rhomboids as well as posterior deltoid
2011 World Archery Coaching Seminar Alignment - Sagittal • Again very important that the archer stands up straight and does not lean to the side. The archer should be like a crane
2011 World Archery Coaching Seminar Execution • Consistent execution is the result of a good physical setup, draw and alignment • Execution is the difference between the best and all the rest • Some videos of different execution
2011 World Archery Coaching Seminar Execution Errors • As the signal from the brain to relax the fingers is sent some of the upper body musculature also relaxes – causing collapse or softness on the shot • Can result from: • Pain response • Not learning the shot properly • Poor alignment • Lack of strength
2011 World Archery Coaching Seminar Tracking Execution Errors • Can quantify strength of execution via 2D tracking. • 6 marker upper body model • Able to provide joint angles, displancements, velocities and accelerations
2011 World Archery Coaching Seminar What execution looks like
2011 World Archery Coaching Seminar Automatic Technique • In archery when shooting at a target the archer has an external focus on: • Aiming • Wind conditions • Time • The archer is not focusing on his/her technique. Therefore if it is not well learnt or automatic then it is more likely to break down
Increase Contextual Interference -Increase Draw Weight, shoot at a target face, increase shooting distance, add pressure etc. 2011 World Archery Coaching Seminar Skill Acquisition
2011 World Archery Coaching Seminar References Axford, A. (1995). Archery Anatomy (1st ed.). London UK: Souvenir Press. Ertan, h., Kental, B., Tumer, S.T., and Korkusuz, F. (2003). Activation patterns in forearm muscles during archery shooting. Human Movement Science, 22, 37-45 Ertan, H. (2009). Muscular activation patterns of the bow arm in recurve archery. Journal of Science and Medicine in Sport, 12, 357-360. Lin, Jiu-Jenq, Hung, Cheng-Ju, Yang, Ching-Ching, Chen, Hsing-Yu, Chou, Feng-Ching and Lu, Tung-Wu (2010). Activation and tremor of the shoulder muscles to the demands of an archery task. Journal of Sports Sciences, 28: 4, 415-421. Leroyer, P., Hoecke, V., and Helal, N. (1993). Biomechanical study of the final push-pull in archery. Journal of Sports Sciences, 11, 63-69 Mann, D. L., and Littke, N. (1989). Shoulder injuries in archery. Canadian Journal of Sports Sciences, 14. 85-92. Nishizono, H., Shibayama, H., Izuta, T., and Saito, K. (1987). Analysis of archery shooting techniques by means of electromyography. International society of biomechanics in sports. Proceedings. Symposium V (pp. 365-371). Athens, Greece. Park. J., and Larven. J. (2007) Archery Australia Shooting Technique: Biomechanics. Schmid, M., Schieppati, M., and Pozzo, T. (2006). Effect of fatigue on the precision of a whole-body pointing task. Neuroscience, 139, 909-920. Logan, O. (2011). A framework for technical modification: an archery case example. The Sport and Exercise Scientist: the official publication of the British Association of Sport and Exercise Sciences. (29). Masters, R.S.W. and Maxwell, J.P. (2004). 'Implicit motor learning, reinvestment and movement disruption: What you don't know won't hurt you?'. In Williams, A.M. and Hodges, N.J. (eds) Skill Acquisition in Sport: Research, Theory and Practice. Routledge: London Masters, R.S.W. (2008). 'Skill learning the implicit way - say no more!'. In Farrow, D., Baker, J. and MacMahon C. ‘Developing Sport Expertise: Researchers and Coaches Put Theory Into Practice.’ Routledge: London Porter, J.M and Magill, R.A. (2010). 'Systematically increasing contextual interference is beneficial for learning sports skills'. Journal of Sports Sciences, (28): 1277-1285. Schmid, M., Schieppati, M., and Pozzo, T. (2006). Effect of fatigue on the precision of a whole-body pointing task. Neuroscience, 139, 909-920.
