TABLE 1.
Changes in match-play metrics in football referees from the Spanish first and second divisions before and after the COVID-19 lockdown.
| Match-play metrics | First Division |
Second Division |
||||||
|---|---|---|---|---|---|---|---|---|
| Pre-Lockdown | Post-Lockdown | 95% CI Diff | P-value | Pre-Lockdown | Post-Lockdown | 95% CI Diff | P-value | |
| Total distance (m) | 10463 (943) | 10073 (1039) | -674 to -106 | .007* | 10381 (745) | 10644 (688) | 81 to 444 | .005* |
| Distance < 6 km · h-1 (m) | 3545 (632) | 3907 (780) | 153 to 570 | .001* | 3200 (414) | 3457 (411) | 151 to 364 | < .001* |
| Distance 6–12 km · h-1 (m) | 3486 (473) | 3137 (588) | -505 to -191 | < .001* | 3524 (495) | 3548 (450) | -95 to 142 | .696 |
| Distance 12–18 km · h-1 (m) | 2504 (556) | 2223 (771) | -482 to -78 | .007* | 2688 (436) | 2734 (411) | -62 to 153 | .402 |
| Distance 18–21 km · h-1 (m) | 530 (158) | 477 (197) | -106 to .01 | .047* | 579 (142) | 550 (132) | -5 to 64 | .098 |
| Distance 21–24 km · h-1 (m) | 271 (111) | 234 (129) | -71 to -1 | .039* | 281 (94) | 254 (95) | 2 to 51 | .034* |
| Distance > 24 km · h-1 (m) | 128 (89) | 96 (79) | -57 to -8 | .010* | 106 (67) | 100 (61) | -23 to 11 | .465 |
| Accelerations (n) | 2809 (251) | 3010 (231) | 134 to 267 | < .001* | 2742 (265) | 2949 (192) | -261 to -152 | < .001* |
| Decelerations (n) | 2809 (251) | 3011 (231) | 135 to 268 | < .001* | 2742 (265) | 2949 (193) | -262 to -152 | < .001* |
| Peak acceleration (m · s-2) | 4.6 (.92) | 4.3 (.91) | -.52 to .01 | .045* | 4.4 (.64) | 4.4 (.72) | -.11 to .20 | .358 |
| Peak deceleration (m · s-2) | 5.3 (.83) | 5.0 (1.0) | -.11 to -.63 | .008* | 5.2 (.63) | 5.1 (.71) | -.32 to .12 | .203 |
| Sprint distance (m) | 229 (135) | 174 (125) | -92 to -14 | .005* | 205 (104) | 188 (84) | -10 to 42 | .172 |
| Sprints (n) | 10.5 (6.1) | 8.1 (6.0) | .72 to 4.1 | .005* | 9.7 (4.5) | 8.7 (3.7) | -.11 to 2.0 | .064 |
| Peak speed (km · h-1) | 28.7 (2.1) | 28.0 (2.9) | -1.5 to .12 | .075 | 28.5 (1.9) | 28.3 (2.2) | -.42 to .81 | .498 |
| Peak HR (b · m-1) | 171 (9) | 170 (7) | -3.8 to 1.3 | .276 | 179 (9) | 179 (7) | -2.6 to -2.4 | .952 |
| Average HR (b · m-1) | 146 (12) | 142 (9) | -6.5 to -.32 | .023* | 153 (12) | 150 (8) | -.34 to 5.4 | .078 |
| HRmax (%) | 82.3 (6.9) | 81.2 (3.9) | -2.5 to -.34 | .132 | 82.7 (5.7) | 81.5 (4.3) | -.21 to 2.5 | .085 |
*
Significant differences between pre- and post-lockdown at P-value < .05. HR: Heart rate. CI: Confidence interval. Sprints: runs > 24km · h-1.