performed
computerised time-motion analyses and measurements of heart rate (HR) on 12
referees during 4 Champions League, 4 UEFA Cup and 4 national games in their
study.According to their study, total distance covered, heavy intensity running and
backwards running were 10.30 ± 0.28, 1.87 ± 0.20and 0.86 ± 0.08 km, respectively.
Mean HR during the match was 150 bpm. Total distance covered during the match
and backwards running decreased (p < 0.05) by 11% and 48% from 0-15 to 75-90
min, but heavy intensity running was unaltered. According to the study of Weston
et al. (2007)