Table 1: Impacts to the head greater than 10g by total and player group in amateur rugby union for total, forwards, backs and per player over a season of matches for linear and rotational acceleration. Data are presented as mean, standard deviation, median [interquartile range], 95th percentile and cumulative scores.
Impacts
Resultant Linear Acceleration (g)
Resultant Rotational Acceleration (rad/s2)
Number impacts recorded
Average per match competition season
Average
per player
Mean ±SD
duration
Mean ±SD
Median [IQR]
95%
Total Frequency
Impact burdena
Mean ±SD
Median [IQR]
95%
Total Frequency
Impact burdena
(ms)
 
Mean ±SD
Mean ±SD
Player Position1
18,877
1,242 ±520
91 ±45
9.3 ±1.4
21 ±14
17 [13-23]
49
25,947 ±10,531
3,107 ±3,002
2,111 [1,211-3,869]
9,399
3,827,791 ±1,537,960
Forwards2
11,249
1,406 ±583
109 ±52
10.0 ±1.3
22 ±14
18 [13-24]
49
30,170 ±11,453
3,136 ±3,102
2,145 [1,155-4,027]
9,520
4,410,185 ±1,706,292
Backs3
7,628
1,055 ±397
71 ±26
8.5 ±0.9
20 ±14
16 [12-23]
48
21,119 ±7,402
3,065 ±2,845
2,142 [1,272-3,646]
9,210
3,162,198 ±1,073,926
Per player4
18,877
932 ±623
82 ±69
9.2 ±1.4
21 ±2
16 [14-19]
49
19,459 ±12,891
3,230 ±2,988
2,299 [1,933-2,546]
9,547
2,870,843 ±1,853,473

1 = 15 positions; 2 = 8 player positions; 3 = 7 player positions; 4 = 43 players; a = The total impact frequency burden is the sum of all the impacts by linear and rotational accelerations; ms = milliseconds; IQR = 25th and 75th interquartile range; 95% = 95th percentile
 
 
Table 2:    Impacts to the head greater than 10g by player position in amateur rugby union over a season of matches for linear and rotational acceleration. Data are presented as mean (standard deviation), median [interquartile range], 95th percentile and cumulative impact burden per player
Impacts
Resultant Linear Acceleration (g)
Resultant Rotational Acceleration (rad/s2)
Total
Average per player
per match
Mean ±SD
Duration (ms)
Mean ±SD
Mean ±SD
Median [IQR]
95%
Total Impact
Frequency Burdenb
Mean ±SD
Median [IQR]
95%
Total Impact
Frequency Burdenb
L-H Prop
1,298
98 ±47
7.5 ±5.0
20 ±15
15 [12-23]
50
25,928
3,100 ±3,033
2,014 [1,306-3,371]
9,858
4,023,287
Hooker
2,014
129 ±105
9.5 ±7.3
23 ±15
18 [13-28]
52
45,883
3,562 ±3,029
2,597 [1,388-4,776]
9,436
7,174,636
T-H Prop
1,227
80 ±62
10.3 ±8.1
23 ±16
17 [13-26]
53
27,743
3,684 ±3,329
2,527 [1,495-4,608]
10,936
4,520,165
Left Lock
992
90 ±76
9.6 ±7.8
23 ±15
18 [13-27]
52
22,491
3,592 ±3,248
2,564 [1,349-4,678]
10,200
3,563,050
Right Lock
522
38 ±11
10.0 ±7.5
23 ±14
18 [13-27]
52
11,769
3,466 ±3,193
2,353 [1,552-4,047
10,252
1,809,080
B-S Flanker
2,339
166 ±56
12.3 ±8.7
18 ±10
18 [14-19]
30
42,881
1,439 ±2,255
758 [151-1,702]
5,555
3,365,730
O-S Flanker
1,696
119 ±100
10.5 ±7.3
23 ±15
18 [14-26]
54
38,615
3,780 ±3,104
2,762 [1,797-4,699]
10,069
6,410,623
No. Eight
1,161
102 ±58
10.2 ±7.6
22 ±15
17 [13-26]
51
26,049
3,803 ±3,124
2,793 [1,714-4796]
10,005
4,414,911
Halfback
522
43 ±28
8.36 ±7.9
20 ±13
14 [11-23]
49
10,305
3,160 ±3,142
1,755 [1,044-4,294]
10,222
1,649,328
First 5/8
594
39 ±20
8.7 ±7.1
21 ±15
15 [11-25]
52
12,429
3,454 ±3,557
2,142 [1,178-4,694]
10,640
2,051,771
Left Wing
1,151
67 ±34
10.2 ±8.5
21 ±16
16 [12-23]
51
24,478
2,525 ±2,368
1,747 [1,161-2,953]
7,166
2,905,787
Second 5/8
1,294
95 ±60
8.3 ±7.9
19 ±13
14 [12-20]
45
27,294
3,053 ±2,943
2,089 [1,213-3,595]
9,423
4,444,897
Centre
1,270
55 ±30
8.8 ±7.2
22 ±17
16 [12-24]
55
18,686
3,414 ±3,188
2,356 [1,329-4,111]
10,399
2,956,649
Right Wing
1,460
83 ±64
7.1 ±6.4
18 ±12
14 [12-19]
39
25,929
2,714 ±2,584
1,906 [1,188-3,220]
7,917
3,963,060
Fullback
1,337
87 ±55
8.2 ±6.4
21 ±13
19 [13-25]
43
28,717
3,114 ±2,382
2,466 [1,713-3,579]
8,301
4,163,892

a = L-H Prop = Loose-head Prop; T-H Pop = Tight-head prop; B-S Flanker = Blind-side Flanker; O-S Flanker = Open-side Flanker; b = The total impact frequency burden is the sum of all the impacts by linear and rotational accelerations; IQR = 25th and 75th interquartile range; 95% = 95th percentile