@article{ref1,
title="Injuries during return to sport after the COVID-19 lockdown: an epidemiologic study of italian professional soccer players",
journal="Orthopaedic journal of sports medicine",
year="2022",
author="Mazza, Daniele and Annibaldi, Alessandro and Princi, Giorgio and Arioli, Leopoldo and Marzilli, Fabio and Monaco, Edoardo and Ferretti, Andrea",
volume="10",
number="6",
pages="e23259671221101612-e23259671221101612",
abstract="BACKGROUND: The injury rate in professional soccer players may be influenced by match frequency. <br><br>PURPOSE: To assess how changes in match frequency that occurred because of coronavirus disease 2019 (COVID-19) influenced training and match injuries in the Italian Serie A league. STUDY DESIGN: Descriptive epidemiology study. <br><br>METHODS: Three phases in the Serie A league, each 41 days long, were evaluated: phase A was the beginning of the 2019-2020 season; phase B was a period after the COVID-19 lockdown was lifted, when the remaining matches of the season were played with greater frequency; and phase C was the beginning of the 2020-2021 season. All male professional soccer players who were injured during the 3 phases were included. Player age, height, position, injury history, and return to play (RTP) were retrieved from a publicly available website. Training- and match-related injuries during each of the 3 phases were collected and compared. Moreover, match injuries that occurred after the lockdown phase (phase B), in which there were 12 days designated for playing matches (&quot;match-days&quot;), were compared with injuries in the first 12 match-days of phases A and C. <br><br>RESULTS: When comparing 41-day periods, we observed the injury burden (per 1000 exposure-hours) was significantly lower in phase B (278.99 days absent) than in phase A (425.4 days absent; P <.05) and phase C (484.76 days absent; P <.05). A longer mean RTP period was recorded in phase A than in phase B (44.6 vs 23.1 days; P <.05). Regarding 12-match day periods (81 days in phase A, 41 days in phase B, and 89 days in phase C), there was a significantly higher match injury rate (0.56 vs 0.39 injuries/1000 exposure-hours; P <.05) and incidence (11.8% vs 9.3%; P <.05) in phase B than in phase A and a longer mean RTP period in phase A than in phase B (41.8 vs 23.1 days; P <.05). Finally, the rate and incidence of training-related injuries were significantly higher in phase B (4.6 injuries/1000 exposure-hours and 6.5, respectively) than in phase A (1.41 injuries/1000 exposure-hours and 2.04, respectively) (P <.05). <br><br>CONCLUSION: Both training- and match-related injuries were greater during the abbreviated period after the COVID-19 lockdown. These may be linked to the greater match frequency of that period.<p /> <p>Language: en</p>",
language="en",
issn="2325-9671",
doi="10.1177/23259671221101612",
url="http://dx.doi.org/10.1177/23259671221101612"
}