. Author manuscript; available in PMC: 2018 Nov 27.

Published in final edited form as: J Neurosurg Pediatr. 2017 Sep 12;20(5):489–497. doi: 10.3171/2017.5.PEDS16627

TABLE 2.

Summary of HIE data for each practice drill

Drill	No. of Impacts	No of I mpacts/Minute/Player		Linear Acceleration (g)		Rotational Acceleration (rad/sec²)
Drill	No. of Impacts	Mean	95% Cl	50th Percentile	95th Percentile	50th Percentile	95th Percentile
Dummy/sled tackling	9	0.09^a,b,c,d	0.05–0.17	18.0	48.7	833.0	1576.3
Install	1197	0.15^e,f,g,h	0.14–0.17	19.7	51.7	954.4	2280.0
Special teams	52	0.13^i,j,k	0.09–0.17	18.9	54.7	835.0	2152.8
Multiplayer tackle	164	0.59^a,e,i,l,m,n	0.41–0.85	21.4	44.1	1018.4	2279.7
Oklahoma	148	0.40^b,f,j,o,p	0.29–0.54	22.9	61.6	1074.3	2958.0
One-on-one	102	0.31^c,g,k,q	0.24–0.42	24.2	66.4	915.0	2584.2
Open-field tackling	50	0.18^l	0.13–0.24	24.7	97.8	1326.4	3816.3
Passing	27	0.15^m,o	0.11–0.21	17.0	45.9	950.3	2415.5
Position skill work	152	0.09^h,n,p,q,r,s	0.07–0.11	19.5	69.2	905.9	2556.6
Scrimmage	89	0.29^r	0.18–0.45	18.9	50.8	869.8	2197.6
Tackling drill stations	135	0.29^d,s	0.19–0.45	21.2	63.3	1010.2	2524.5

^a–s

Drills that share the same superscript have mean numbers of impacts per minute per player that differ at p < 0.05.