Average change estimates (with 95% CI) for the variables in the control periods and the periods leading up to injury for 56 male elite youth football players aged 17–19 years old
| Variable | Change over the 30 days leading up to injury (B, 95% CI) | Changes over the 30 days control period (B, 95% CI) |
| S-RPE (au) | 2.30 (0.97 to 3.62) | 0.90 (2.66 to 0.80) |
| Average HR (bpm) | 0.81 (0.52 to 1.09) | 0.22 (0.60 to 0.15) |
| TD (m) | 0.38 (0.24 to 0.51) | 0.19 (0.16 to 0.20) |
| ACC (ne) | 3.67 (2.28 to 5.03) | 0.42 (2.25 to 1.35) |
| IA (ne) | 0.31 (0.13 to 0.51) | 0.03 (0.28 to 0.21) |
| VIA (ne) | 0.04 (0.01 to 0.08) | 0.01 (0.09 to 0.06) |
| DEC (ne) | 4.03 (2.52 to 5.52) | 0.64 (2.65 to 1.31) |
| ID (ne) | 0.26 (0.02 to 0.50) | 0.01 (0.35 to 0.36) |
| VID (ne) | 0.09 (0.05 to 0.13) | 0.02 (0.04 to 0.08) |
| HIRd (m) | 3.21 (1.74 to 4.67) | 0.61 (1.38 to 2.53) |
| HSRd (m) | 1.26 (0.58 to 1.95) | 0.32 (0.57 to 1.19) |
| Sd (m) | 0.61 (0.32 to 0.90) | 0.02 (0.41 to 0.36) |
| Msd (m) | 0.09 (0.04 to 0.14) | 0.02 (0.10 to 0.05) |
Acc, accelerations (>0); au, arbitrary units; B, unstandardised beta coefficient; bpm, beats per minute; CI, credibility interval; Dec, decelerations (<−0); HIRd, high-intensity running distance (15−19.79 km/hour); HSRd, high-speed running distance (19.8−24.79 km/h); IA, intense accelerations (>2 m/s²); ID, intense decelerations (<−2 m/s²); m, metres; Msd, maximal sprint distance (>29.8 km/h); ne, number of efforts; Sd, Sprint distance (24.8–29.9 km/h); S-RPE, session rate of perceived exertion; TD, total distance (>0 km/h); VIA, very intense accelerations (>3 m/s²); VID, very intense decelerations (<−3 m/s²).