Table 2:

Frequency and percent of the 7 consistent participants of each position and lineup designation, as well as average age at each practice timepoint

	Practice Number	PRE 1	PRE 2	PRE 3	POST 1	POST 2	POST 3
Participants (n)		7	7	7	7	7	7
Average age		20	20	20	20	20	20
Position (n(%))
	OL	1 (7.69%)	1 (8.3%)	1 (5.9%)	1 (7.1%)	1 (7.1%)	1 (7.69%)
	DL	1 (7.69%)	1 (8.3%)	1 (5.9%)	1 (7.1%)	1 (7.1%)	1 (7.69%)
	RB	1 (7.69%)	1 (8.3%)	1 (5.9%)	1 (7.1%)	1 (7.1%)	1 (7.69%)
	TE	1 (7.69%)	1 (8.3%)	1 (5.9%)	1 (7.1%)	1 (7.1%)	1 (7.69%)
	LB	3 (23.1%)	3 (25%)	3 (17.7%)	3 (21.4%)	3 (21.4%)	3 (23.1%)
Starter (n(%))
	Starter (S)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	Rotational (R)	3 (23.1%)	3 (25.0%)	3 (17.7%)	3 (21.4%)	3 (21.4%)	3 (23.1%)
	Non-starter (N)	4 (30.8%)	4 (33.3%)	4 (23.5%)	4 (28.6%)	4 (28.6%)	4 (30.8%)

Note: PLA = peak linear acceleration, PAA = peak angular acceleration, PRE = 3 practice sessions without the guardian cap and POST = 3 practice sessions with the guardian cap, OL = offensive lineman, DL = defensive lineman, RB = running back, TE = tight end, LB = linebacker