“Head Impacts” in - ACSEP conf preso's... · • Data from the Super 15 rugby 2013 season shows that midfield backs are the most common ball carriers and that loose forwards make
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“Head Impacts” in
Semi Professional
Rugby
Hamish Osborne
Head Impacts in Rugby Union
• Concussion risk goes up with concussion
• Concussion – Depression Link
• Contact Sport – Neurcognitive Disease
Link
Subconcussive Hits
This data showed the concussive threshold risk is greatly elevated when the head was subject to peak linear acceleration of greater than 98 gravitational forces (g) and peak rotational acceleration of greater than 6432 rad/s2
• Data from the Super 15 rugby 2013 season shows that midfield backs are the most common ball carriers and that loose forwards make the most tackles (15 of the top 20 tacklers in the 2013 season were flankers). Its therefore not surprising that the highest rates of concussion occur in inside and midfield backs, followed by loose forwards (4.4, 5.9 and 4.4 per 1000 player hours vs. the less mobile locks at 1.4/1000 player hours).12 Fuller et al (2010) confirmed that high speed ball carrying is also a significant risk for concussion where the relative risk of either the ball carrier or the tackler being concussed is doubled when the ball carrier is running at speed.13 Thus both the back and the forwards tackling them present the highest at risk groups.11,13
Hits by player groups
Front Row Inside Bk Lock Loosies Outside Backs
Linear hit by weight
Hits by event
Carry Coll Ruck Scrum Tackle Loosies
Outsi
Snapshot of results
Biggest Impact (g) Number of impacts Number above 60g
Prop 230 32 7
Hooker 233 120 8
Prop 284 74 5
Lock 225 53 1
Lock 231 115 10
Flanker 37 7 0
Flanker 277 153 8
8 209 59 3
9 229 49 6
10 123 40 6
11 141 36 5
12 230 95 12
13 224 47 2
14 249 68 5
15 69 65 2
Hooker 193 23 4
1 284 85 10
3 212 96 4
Flanker 281 56 4
Flanker 323 86 10
12 285 48 2
9 41 6 0
11 248 51 13
Average 211 64 6
The Problem
• 407 hits mapped to events from 6 games
• Single Game Data showed 64 hits per player
Subconcussive Blows
• Rugby Data
– Range of hits 10-169 G
– 564 per player per season
– 4643 hits per season that exceeded threshold
So…
• Ive been thinking about the next question
– The next grant application
– What to tell the media
My suggestion
• When scientists tell us things like
• We should be very skeptical
HOW MANY HITS DID WE MAP
407 div 15 div 6 = 4.5 hits per player per game
THE NEXT QUESTION
If more work is to be done we need to work out the sensor problem
Until then no further research should be done
Thanks
• Dunedin School of Medicine Deans Bequest Fund
• South Island Brain Injury Research Group (SIBIRG)
• Otago Rugby Team
• New Zealand Rugby (Dr Ian Murphy)
• World Rugby
• Every Player we played
• CSx Concussion Management Systems
• Dr Daneille Salmon– Jayden Pinfold
– Lorenz Kissling
• Sky Sport
• Hayden Croft
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