Generalizability of Results
The results of this trial are in accordance with the by Arnason et al,1
who reported
a 65% lower injury incidence in a group of athletes completing a training program consisting of warm-up stretching, flexibility training, and the Nordic hamstring exercise
compared with warm-up stretching and flexibility training
alone. This indicates that the preventive effect is solely
a result of the Nordic hamstring exercise. In general, the
lack of effect of stretching before exercise on muscle injury
prevention has been shown.30 These findings might be
attributable to the fact that eccentric training, and not
stretching, alters the mechanical properties of the
hamstrings.7,21
In this study, 50 of 116 teams from the 5 best competition levels participated. The reasons given by the teams
for declining participation in the trial were primarily
a fear of low compliance with the training intervention
because they were uncertain about their head coach for
the upcoming season. Other reasons were concerns about
the amount of time demanded by the training program
and fears that participating in the trial would diminish
the players’ concentration on the impending soccer season.
These issues reflect some of the problems concerning scientific studies in elite sports. Even though decliners theoretically may differ with regard to fitness and training levels,
we do not believe that this has influenced the results of this trial. We are therefore convinced that the findings in this
trial are valid for male professional and amateur soccer
players. Whether the results can be generalized to women,
other age groups, or to other sports is not known.
Generalizability of Results
The results of this trial are in accordance with the by Arnason et al,1
who reported
a 65% lower injury incidence in a group of athletes completing a training program consisting of warm-up stretching, flexibility training, and the Nordic hamstring exercise
compared with warm-up stretching and flexibility training
alone. This indicates that the preventive effect is solely
a result of the Nordic hamstring exercise. In general, the
lack of effect of stretching before exercise on muscle injury
prevention has been shown.30 These findings might be
attributable to the fact that eccentric training, and not
stretching, alters the mechanical properties of the
hamstrings.7,21
In this study, 50 of 116 teams from the 5 best competition levels participated. The reasons given by the teams
for declining participation in the trial were primarily
a fear of low compliance with the training intervention
because they were uncertain about their head coach for
the upcoming season. Other reasons were concerns about
the amount of time demanded by the training program
and fears that participating in the trial would diminish
the players’ concentration on the impending soccer season.
These issues reflect some of the problems concerning scientific studies in elite sports. Even though decliners theoretically may differ with regard to fitness and training levels,
we do not believe that this has influenced the results of this trial. We are therefore convinced that the findings in this
trial are valid for male professional and amateur soccer
players. Whether the results can be generalized to women,
other age groups, or to other sports is not known.
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