TABLE 4.

Internal load markers in young soccer players

	Healthy	Illness	Non-contact injury
RPE	4.6 ± 1.8	4.2 ± 1.6	4.7 ± 1.9
MONOTONY	3.2 ± 3.4	3.2 ± 2.9	2.9 ± 2.7
STRAIN	5065.2 ± 5505.2	4629.8 ± 5531.2	4428.1 ± 3495.0
S-RPE	415.6 ± 250.2	358.1 ± 191.7	414.8 ± 222.3
WL	1633.2 ± 893.1	1410.0 ± 533.0	1564.9 ± 819.8
A:C4	1.1 ± 0.4	1.1 ± 0.3	1.2 ± 0.4
TQR	7.0 ± 1.4	6.9 ± 1.3	6.6 ± 1.4
%WL	13.8 ± 51.5	6.2 ± 21.3	11.7 ± 25.5
Z-TQR-RPE	0.02 ± 1.3	0.1 ± 1.2	–0.1 ± 1.4

Data are presented as mean ± SD. Scores of RPE, Monotony, Strain, S-RPE, WL, A:C4, TQR, %WL, Z-TQR-RPE in the week preceding an Illness, a non-contact injury and without injuries, were reported. RPE = rate of perceived exertion; S-RPE = session rating of perceived exertion; WL = weekly load; A:C4 = acute to chronic workload ratio for 4 weeks; TQR = total quality recovery; %WL = week-to-week percentage variation; Z-TQR-RPE = difference between Z-TQR (z-score transformation) and Z-RPE (z-score transformation).