Comment on “Frequency and Magnitude of Game-Related Head Impacts in Male Contact Sports Athletes: A Systematic Review and Meta-Analysis”

  • Michael FantonEmail author
  • Lyndia Wu
  • David Camarillo
Letter to the Editor

Dear Editor,

We read the recent meta-analysis [1] on the frequency and magnitude of in vivo head impacts in contact sports with great interest, as there is a lack of multi-sport head impact exposure comparisons in the literature. This is in large part due to the wide variance in methodologies used to collect head kinematics data and differentiate true head impacts from false impacts. These inconsistencies greatly limit the comparisons that can be made across sports and even across studies within the same sport. In their review [1], the authors compared the impact exposure for contact sports athletes in 21 different studies of various sports. The cited studies used a variety of sensor systems for measuring head kinematics. Sensor devices were installed within the helmet, on skin-mounted patches, or in players’ mouthguard with a simple 10–15 g threshold used to record an acceleration event (AE). However, methods for distinguishing real head impacts from false positive AEs varied widely...


Compliance with Ethical Standards


No sources of funding were used to assist in the preparation of this article.

Conflicts of Interest

Michael Fanton, Lyndia Wu and David Camarillo have received multiple grants for developing, testing and distributing mouthguard sensors for players involved in contact sports. These authors have also filed or been granted the following patents focusing on mouthguard sensor technology: ‘Device for detecting on-body impacts’ US Patent No. 10,172,555 granted 1/8/2019; ‘Oral appliance for measuring head motions by isolating sensors from jaw perturbance US Provisional Patent Application filed 8/12/2015 (15/373454); and ‘Multi-directional dynamic model for TBI detection’ US Provisional Patent Application currently being filed (62/778,879).


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringStanford UniversityStanfordUSA
  2. 2.Department of Mechanical EngineeringUniversity of British ColumbiaVancouverCanada
  3. 3.Department of BioengineeringStanford UniversityStanfordUSA

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