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![•Croisier JL, & Crielaard JM. (2000) Isokin Exerc Sci, 8:175-180.
•Fyfe JJ, Opar DA, Williams MD, Shield AJ. (2013) J Electromyog Kinesiol, 23(3): 523-530.
•Greig, M. (2008) Am J Sports Med, 36(7):1403-1409.
•Jönhagen, S, Nemeth, G, & Eriksson, E. (1994) Am J Sports Med, 22(2):262-266.
•Lee MJ, Reid SL, Elliott BC, Lloyd DG. (2009) Med Sci Sports Exerc, 41(10):1942- 1951.
•Opar DA, Williams MD, Timmins RG, Dear NM, Shield, AJ. (2013) J Electromyog Kinesiol, 23(3):696-703.
•Opar DA, Williams MD, Timmins RG, Dear NM, Shield, AJ. (2013) Am J Sports Med, 41(1):116-125.
•Silder A, Heiderscheit BC, Thelen DG, Enright T, Tuite, MJ. (2008) Skeletal
•Radiology 37(12):1101-1109.
•Sole G, Milosavljevic S, Nicholson HD, Sullivan SJ. (2011) JOSPT, 41(5):354-363.
•Timmins RG, Opar DA, Williams MD, Schache AG, Dear NM, Shield AJ. (2014) Scand J Med Sci Sport. Jan 15. doi: 10.1111/sms.12171
•Timmins RG, Shield AJ, Williams MD, Lorenzen C, Opar DA. (2014) Med Sci Sports Exerc, Sep 9. [Epub ahead of print]
References
18](https://image.slidesharecdn.com/13isnmiariskfactorforhamstringstraininjuryshield-141012150516-conversion-gate02/75/Anthony-Shield-is-nmi-a-risk-factor-for-hamstring-strain-injury-18-2048.jpg)
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Anthony Shield - is nmi a risk factor for hamstring strain injury
The document explores the relationship between neuromuscular inhibition (NMI) and hamstring strain injuries, highlighting that NMI can lead to persistent eccentric weakness, increasing re-injury risk. It discusses evidence of strength deficits and rehabilitation challenges faced by athletes post-injury. The findings suggest the importance of addressing NMI through targeted rehabilitation to improve recovery outcomes and reduce injury recurrence.
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Anthony Shield - is nmi a risk factor for hamstring strain injury
- 1. Is neuromuscular inhibitiona risk factor for hamstring strain? Tony Shield School of Exercise & Nutrition Sciences Institute of Health & Biomedical Innovation Queensland University of Technology
- 2. Ryan Timmins, MorganWilliams, Matt Bourne, Dave Opar
- 3. Running & kneeflexor strength Greig (2008) Eccentric strength loss with little or no concentric decline. Suggests possibility of inhibition Concentric Torque Eccentric Torque
- 4. doi: 10.1111/sms.12171 Thedecline in Bfem sEMG ‘explains’ changes in eccentric knee flexor strength (r2=0.69, p<0.001) 1830m sprints
- 5. Prior hamstring injury Persistent eccentric weakness From Croisier & Crielaard 2000 Evident months to years after grade 2+ injury Jönhagen et al 1994, Lee et al 2009 Opar et al 2013
- 6. Is rehabilitation sabotagedby neuromuscular inhibition? 6
- 7. Hamstring strain injury Pain Avoid long m lengths Activity NMI Atrophy Fascicle lengths Opt. m length Strength Ecc>Con, Long>Short Prop. m damage Re-injury risk
- 8. ‘Recovered hamstring’ Resumelong m lengths Activity NMI Atrophy Fascicle lengths Opt. m length Strength Ecc>Con, Long>Short Prop. m damage Re-injury risk BFlh
- 9. Our model… •Athleteswith Hx of unilateral strain injury –At least one grade 2-3 strain –‘Conventional’ rehabilitation –Returned to full training & competition
- 10. Evidence for inhibition 8-12% deficits 18-20% deficits 23(3):696-703
- 11. Reduced voluntary activation Inhibition limited to eccentric actions Twitch interpolation during maximal isokinetic contractions Buhmann et al unpublished
- 12. Reduced muscle use(MRI) 0 10 20 30 40 Inj BFlh Uninj BFlh % T2 relaxation Limb 9 elite to sub-elite track athletes ~8.5 mo post injury 1040m sprints p<0.05 Bourne et al unpublished
- 13. p<0.05 * ST> BFlh, BFsh, SM p<0.05 10 recreational to sub-elite athletes, ~9.8 mo post injury Reduced muscle use (MRI) 610 Nordics Bourne et al unpublished
- 14. Timmins et al(2014) Med Sci Sports Exerc. [Epub ahead of print]
- 15. Hamstring strain injury Pain Avoid long m lengths Activity NMI Atrophy Fascicle lengths Opt. m length Strength Ecc>Con, Long>Short Prop. m damage Re-injury risk Opar et al Sole et al Timmins et al Silder et al Sole et al Opar et al Jönhagen et al Lee et al
- 16. Return to playw/out inhibition Rehabilitation Retraining Competing Intensity of eccentric hamstring contractions Time 16 Eccentric strength Voluntary activation Muscle size Fascicle lengths Altered collagen expression? Damage resistance
- 17. Rehabilitation Retraining Competing Intensity of eccentric SM, ST & BFlh contractions Time With BF inhibition… 17
- 18. •Croisier JL, &Crielaard JM. (2000) Isokin Exerc Sci, 8:175-180. •Fyfe JJ, Opar DA, Williams MD, Shield AJ. (2013) J Electromyog Kinesiol, 23(3): 523-530. •Greig, M. (2008) Am J Sports Med, 36(7):1403-1409. •Jönhagen, S, Nemeth, G, & Eriksson, E. (1994) Am J Sports Med, 22(2):262-266. •Lee MJ, Reid SL, Elliott BC, Lloyd DG. (2009) Med Sci Sports Exerc, 41(10):1942- 1951. •Opar DA, Williams MD, Timmins RG, Dear NM, Shield, AJ. (2013) J Electromyog Kinesiol, 23(3):696-703. •Opar DA, Williams MD, Timmins RG, Dear NM, Shield, AJ. (2013) Am J Sports Med, 41(1):116-125. •Silder A, Heiderscheit BC, Thelen DG, Enright T, Tuite, MJ. (2008) Skeletal •Radiology 37(12):1101-1109. •Sole G, Milosavljevic S, Nicholson HD, Sullivan SJ. (2011) JOSPT, 41(5):354-363. •Timmins RG, Opar DA, Williams MD, Schache AG, Dear NM, Shield AJ. (2014) Scand J Med Sci Sport. Jan 15. doi: 10.1111/sms.12171 •Timmins RG, Shield AJ, Williams MD, Lorenzen C, Opar DA. (2014) Med Sci Sports Exerc, Sep 9. [Epub ahead of print] References 18