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Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen.

Publication ,  Journal Article
Bailey, AM; Funk, JR; Crandall, JR; Myers, BS; Arbogast, KB
Published in: Annals of biomedical engineering
October 2021

The Guardian Cap NXT (GC NXT) and the ProTech Helmet Cap (ProTech) are commercially available aftermarket products designed to augment the energy attenuation characteristics of American football helmets. The ability of these helmet shell add-on products to mitigate the severity of impacts typically experienced by professional offensive and defensive linemen was evaluated for seven helmet models using two test series. In linear impactor tests, the GC NXT reduced head impact severity as measured by the head acceleration response metric (HARM) by 9% relative to the helmets only, while the ProTech reduced HARM by 5%. While both products significantly improved the performance of the football helmets tested overall, effects varied by impact condition and helmet model with the add-ons worsening helmet performance in some conditions. The GC NXT had a strong effect size (Cohen's d = 0.8) whereas the ProTech had a medium effect (Cohen's d = 0.5). A second study investigated add-on performance for helmet-to-helmet impacts with eccentric impact vectors and resulted in a mixture of increased and decreased HARM when either add-on was placed on one or both helmets. Estimated risk for serious neck injury with add-ons and without differed by less than 4% for these eccentric impacts.

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Published In

Annals of biomedical engineering

DOI

EISSN

1573-9686

ISSN

0090-6964

Publication Date

October 2021

Volume

49

Issue

10

Start / End Page

2747 / 2759

Related Subject Headings

  • United States
  • Sports Equipment
  • Rotation
  • Materials Testing
  • Humans
  • Head Protective Devices
  • Football
  • Equipment Design
  • Craniocerebral Trauma
  • Biomedical Engineering
 

Citation

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Chicago
ICMJE
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Bailey, A. M., Funk, J. R., Crandall, J. R., Myers, B. S., & Arbogast, K. B. (2021). Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen. Annals of Biomedical Engineering, 49(10), 2747–2759. https://doi.org/10.1007/s10439-021-02842-8
Bailey, Ann M., James R. Funk, Jeff R. Crandall, Barry S. Myers, and Kristy B. Arbogast. “Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen.Annals of Biomedical Engineering 49, no. 10 (October 2021): 2747–59. https://doi.org/10.1007/s10439-021-02842-8.
Bailey AM, Funk JR, Crandall JR, Myers BS, Arbogast KB. Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen. Annals of biomedical engineering. 2021 Oct;49(10):2747–59.
Bailey, Ann M., et al. “Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen.Annals of Biomedical Engineering, vol. 49, no. 10, Oct. 2021, pp. 2747–59. Epmc, doi:10.1007/s10439-021-02842-8.
Bailey AM, Funk JR, Crandall JR, Myers BS, Arbogast KB. Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen. Annals of biomedical engineering. 2021 Oct;49(10):2747–2759.
Journal cover image

Published In

Annals of biomedical engineering

DOI

EISSN

1573-9686

ISSN

0090-6964

Publication Date

October 2021

Volume

49

Issue

10

Start / End Page

2747 / 2759

Related Subject Headings

  • United States
  • Sports Equipment
  • Rotation
  • Materials Testing
  • Humans
  • Head Protective Devices
  • Football
  • Equipment Design
  • Craniocerebral Trauma
  • Biomedical Engineering