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Check out
for background on DrDave’s book

When Heads Come Together


xGo to Journal Articles to read the entire ESPN article on Luke and the Q-collar™…

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BRAIN SLOSH science explained…

Videos enhance the narratives…
Question: “Why don’t Woodpeckers experience Traumatic Brain Injury (TBI)?” Please note the following facts…
  • 12,000 pecks a day
  • 1200 x g force
  • 85 million impacts over it’s life span!!!
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So, what is Brain SLOSH, and why do we care?

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Definition of SLOSH (Hydrodynamics): The study of fluids inside moving containers was first clarified for all of us by NASA, when they coined the term for the phenomenon of “Violently sloshing fuel in the first stage could affect the rocket’s guidance system, potentially knocking it off course.” Dr. David Smith, discovered Brain SLOSH Theory and appropriated the NASA term for what he saw as brain activity when externally traumatized, such as in contact sports.

The brain is 70% LIQUID, combined with the knowledge of Brain SLOSH enabled new, alternative protective solutions for consideration…

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How do we protect the brain against damage from SLOSH? We always thought: HELMETS!


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Look at Newton’s Cradle, demonstrating an ELASTIC collision — the three interior steel balls remain stationary, while only the fifth ball responds. If an interior steel ball were a grape instead, it would EXPLODE, demonstrating an inelastic collision. Think “brain matter difference!”
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More: This is your Brain on SLOSH…

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  • An old fashioned paint mixer from a paint store employed for this demo
  • First two running at 5000 cycles per second
  • With the left side FULLY FILLED with water and the egg
  • And the right side with a SLIGHT AIRSPACE present
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97% filled — SLOSHABLE
Energy absorbed by egg

100% filled — NOT SLOSHABLE
Energy TRANSFERRED thru egg

The mixing machine
— In real time —

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Intense study of Woodpeckers’ brain protection mechanisms under severe conditions led to the extremes Mother Nature employs. Note the omo-hyoid apparatus, i.e., TONGUE, starts at the bridge of the nose, travels over the skull, and splits behind the neck to each side of the VASCULAR TREE (where it can compress the jugular veins) and then piercing back into the beak to cycle in and out with each hit.
So, how might we diminish Brain SLOSH?
The video compares identical clear glass skulls with a partially filled one on the left, while the one on the right is fully filled, thereby enabling ELASTIC collisions.

Part of the impact happens because fluids of differing densities decelerate at different rates, producing a highly undesirable SHEAR force on the brain tissues.
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We have received a gold medal for the collar design from the prestigious IDSA, established in 1965.
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Internal Jugular Vein Compression Mitigates Traumatic Axonal Injury in a Rat Model by Reducing the Intracranial Slosh Effect
David W. Smith, MD, Julian E. Bailes, MD, Joseph A. Fisher, MD, Javier Robles, MD, Ryan C. Turner, BS, James D. Mills, MD
Neurosurgery, Volume 70, Issue 3, 1 March 2012, Pages 740–746,
Published: 05 September 2011
The Effects of External Jugular Compression Applied during Head Impact Exposure on Longitudinal Changes in Brain Neuroanatomical and Neurophysiological Biomarkers: A Preliminary Investigation
Gregory D. Myer
1,2,3,4,5,6*, Weihong Yuan7, Kim D. Barber Foss1,2,8, David Smith1,9, Mekibib Altaye10, Amit Reches11, James Leach12, Adam W. Kiefer1,2,3,13, Jane C. Khoury10, Michal Weiss11, Staci Thomas1,2, Chris Dicesare1,2, Janet Adams12, Paul J. Gubanich1,3, Amir Geva11,14, Joseph F. Clark15, William P. Meehan III5,16,17, Jason P. Mihalik18 and Darcy Krueger19
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Myer GD, et al. Br J Sports Med 2016;0:1–11. doi:10.1136/bjsports-2016-096134 1

Analysis of head impact exposure and brain microstructure response in a season-long application of a jugular vein compression collar: a prospective, neuroimaging investigation in American football
Gregory D Myer,1,2,3,4,5,6 Weihong Yuan,7,8 Kim D Barber Foss,1,2,9,10
Staci Thomas,1,2 David Smith,1 James Leach,11 Adam W Kiefer,1,2,3,12
Chris Dicesare,1,2 Janet Adams,11 Paul J Gubanich,1,3 Katie Kitchen,1,2
Daniel K Schneider,1,2,13 Daniel Braswell,1,2 Darcy Krueger,14 Mekibib Altaye15
JOURNAL OF NEUROTRAUMA 34:1–13 (xxxx xx, 2017) a Mary Ann Liebert, Inc.
DOI: 10.1089/neu.2016.4834

Original Article

Neck Collar with Mild Jugular Vein Compression Ameliorates Brain Activation Changes during a Working Memory Task after a Season of High School Football
Weihong Yuan,1,4 James Leach,2,4 Thomas Maloney,1 Mekibib Altaye,3,4 David Smith,5 Paul J. Gubanich,5,6 Kim D. Barber Foss,5,7–9 Staci Thomas,5,7 Christopher A. DiCesare,5,7 Adam W. Kiefer,5–7,10 and Gregory D. Myer,5–7,11–13
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Myer GD, et al. Br J Sports Med 2018;0:1–14. doi:10.1136/bjsports-2018-099571 1

Altered brain microstructure in association with repetitive subconcussive head impacts and the potential protective effect of jugular vein compression: a longitudinal study of female soccer athletes
Gregory D Myer,1,2,3,4 Kim Barber Foss,1 Staci Thomas,1 Ryan Galloway,1,5 Christopher A DiCesare,1 Jonathan Dudley,6 Brooke Gadd,1 James Leach,7
David Smith,1 Paul Gubanich,1 William P Meehan III,3 Mekibib Altaye,8 Philip Lavin,9 Weihong Yuan5,6
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See the excellent brief videos below and read about the fantastic research conducted by Cincinnati Children’s Center for Sports Medicine under the direction of Greg D. Myer, PhD, FACSM, CSCS,*D, who is the Director of the Research of Human Performance Laboratory.
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