Study Period
The playing season in Denmark starts in July or August
and ends in June in the following year. In the 6- to 8-
week preseason period from June to July/August, most
teams are having a vacation for 2 to 3 weeks. The playing
season includes a midseason competition break from
December to March that divides the first and second halves
of the playing season. In this midseason break, most teams
have a vacation for 2 to 3 weeks.
The 10-week intervention program was introduced in
the midseason break because this is the only time of the
year in which this unaccustomed exercise does not conflict
with the competitive season. The injury registration began
when the participating teams started their first training
session in 2008 (January/February) and ended when the
teams ended their last training session in 2008 (December). Hence, the injury registration period consisted
of the midseason break and second half of the 2007-2008
playing season combined with the preseason and first
half of the 2008-2009 playing season, which equals all
risk periods during a full 12-month season.
The trial was conducted between January 7, 2008, and
December 12, 2008, with follow-up of the last injury until
January 14, 2009.
Study Period
The playing season in Denmark starts in July or August
and ends in June in the following year. In the 6- to 8-
week preseason period from June to July/August, most
teams are having a vacation for 2 to 3 weeks. The playing
season includes a midseason competition break from
December to March that divides the first and second halves
of the playing season. In this midseason break, most teams
have a vacation for 2 to 3 weeks.
The 10-week intervention program was introduced in
the midseason break because this is the only time of the
year in which this unaccustomed exercise does not conflict
with the competitive season. The injury registration began
when the participating teams started their first training
session in 2008 (January/February) and ended when the
teams ended their last training session in 2008 (December). Hence, the injury registration period consisted
of the midseason break and second half of the 2007-2008
playing season combined with the preseason and first
half of the 2008-2009 playing season, which equals all
risk periods during a full 12-month season.
The trial was conducted between January 7, 2008, and
December 12, 2008, with follow-up of the last injury until
January 14, 2009.
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