Compliance recording and reporting
The coaches reported injuries and individual player
participation prospectively, as the number of minutes of
exposure, for each training session and match on weekly registration
forms throughout the study period. Furthermore, for
each session the coaches quantitatively recorded whether the
warm-up programme was carried out, as well as the participation
of each player in the programme (yes/no). The registration
forms were submitted by e-mail, mail, or fax to the Oslo