This file was dowloaded from the institutional repository Brage NIH -brage.bibsys.no/nih Bahr, M. A., Bahr, R. (2014). Jump frequency may contribute to risk of jumper's knee: a study of interindividual and sex differences in a total of 11 943 jumps video recorded during training and matches in young elite volleyball players. & Bahr, 2012). However, it is not known whether jump frequency differs among players on the same squad.Objective: To examine inter-individual and sex differences in jump frequency during training and matches in young elite volleyball players.Design: Observational study.Setting: Norwegian elite volleyball boarding school training program.Participants: Student-athletes (26 boys and 18 girls, 16-18 yrs).

This file was dowloaded from the institutional repository Brage NIH -brage.bibsys.no/nih Skazalski, C., Kruczynski, J., Bahr, M. A., Bere, T. T., Whiteley, R., Bahr, R. (2017 Methods Videos of 24 injuries from major FIVB tournaments were included for analysis (14 men, 10 women). Five analysts reviewed the videos to determine specific situations and mechanisms leading to injuries. ResultsThe majority of injuries occurred during two volleyball situations, blocking (n=15) and attacking (n=6). Injuries to blockers were the result of landing on an opponent (n=11) or teammate (n=4). Attacking injuries most frequently occurred when a backrow player landed on a front row teammate (n=4 of 6). When landing on an opponent under the net, the attacker landed into the opponent's court in 11 of 12 situations but without violating the center line rule. Injuries mostly resulted from rapid inversion without any substantial plantarflexion. ConclusionsThe majority of injuries occur while blocking, often landing on an opponent.The attacker is overwhelmingly to blame for injuries at the net secondary to crossing the center line. Injuries while attacking often result from a back row player landing on a front row teammate. Landing-related injuries mostly result from rapid inversion with the absence of plantarflexion. Abstract Word Count: 243

In this paper the safety issues involving the proper immobilization of the cervical spine and the transfer mechanisms necessary to secure an injured athlete prior to moving them off the ice are reviewed. It is recommended that the helmet be left on during this process to provide stability to the cervical spine. All medical teams which care for ice hockey athletes should follow and rehearse this technique.

BackgroundAnkle sprains are the most prevalent injury in volleyball and it is suggested they result from player contact at the net. Traditionally, ankle sprains are thought to happen in a plantarflexed position, but case studies suggest plantarflexion may not be involved.ObjectiveTo describe the injury situations and mechanisms for ankle injuries in elite volleyball based on systematic video analyses.DesignDescriptive video analysis.SettingNational teams participating in major Fédération Internationale de Volleyball (FIVB) senior-level tournaments.MaterialAll acute ankle injuries with subsequent time-loss (n=32) reported through the (FIVB) Injury Surveillance System (ISS) 2010–2014. Of these, video footage of 24 injuries was available for analysis.Assessment of Risk FactorsInjury situation variables included playing situation, player positions, and center line infringement. Variables examining injury mechanisms included lower extremity (ankle, knee, hip) joint positions at first contact and the index injury frame, joint movement between initial contact and the index frame, and the relationship between ankle dorsiflexion and supination.ResultsThe majority of injuries occurred during blocking (n=15) and attacking (n=6). Injuries to blockers resulted from landing on an opponent (n=11) or teammate (n=4). Attacking injuries mostly occurred when a backrow player landed on a front row teammate (n=4). When landing on an opponent, the attacker landed into the opponent's court in 11 of 12 situations compared to 2 situations for the blocker. When landing on another player, the ankle moved into a neutral dorsiflexed position prior to rapid pronation/supination in 15 situations compared to 1 situation of supination in plantarflexion.ConclusionsThe majority of injuries occur while blocking, often landing on an opponent. The attacker is responsible for injuries at the net secondary to crossing the center line. Landing-related injuries mostly occur with the ankle rapidly supinating in a neutral dorsiflexed position.

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