Mandatory lockdown impairs performance in professional soccer players.

COVID-19 caused a total halt in sport competition during 2020. The purpose of this study was to analyze the changes between pre- and post-lockdown competitive periods players’ workload variables competition. Seventeen professional football players were monitored using WIMU PRO® inertial device throughout 2019-20 season. Anthropometric physical fitness assessed with aim relate possible associations these characteristics periods. During lockdown, carried out an 8-week guided self-training. There general decrement demands competition, parameters related high-intensity actions as accelerations decelerations (-8.96% [ES: 0.64] -11.04% 0.77] respectively; p < .05), Ind HSR (-35.57% 0.92]; = .002), HMLD (-8.58% 0.66]; .016), PLOAD (-7.03% 0.54]; .047) Vmax (-3.80% 0.65]; .016) can be highlighted. results showed high negative correlations match prior lockdown percentage change after period. Individual percentages variability changes. self-training programs should reviewed minimize impact “detraining” period performance new