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Effects of Unstable Conditions on Kinematics and Performance Variables in Young Handball Players.

Urbán T, Gutiérrez Ó, Moreno FJ - J Hum Kinet (2015)

Bottom Line: The execution variability and outcomes found in throwing actions have received special attention in numerous studies in recent years.Results showed significant decreases in throwing velocity in unstable conditions, but these did not significantly affect the accuracy achieved in performance.Differences were also found in movement kinematics between the two throwing conditions and relationships were found between kinematics, velocity and accuracy.

View Article: PubMed Central - PubMed

Affiliation: Sport Research Center. Miguel Hernández University of Elche, Elche-Alicante (Spain).

ABSTRACT
The execution variability and outcomes found in throwing actions have received special attention in numerous studies in recent years. The aim of this study was to analyze the effect of an unstable condition on velocity, accuracy and kinematics of movement in the seven metres throw in handball. Twenty-five young handball players took part in an experiment, throwing towards a target on a stable and an unstable surface. Each participant performed 32 throws, 16 for each situation. Linear variability of the dominant hand was assessed by 3D Motion Tracking. A radar sports gun was used to record the velocity of the ball and the throws were video recorded to establish their accuracy. Results showed significant decreases in throwing velocity in unstable conditions, but these did not significantly affect the accuracy achieved in performance. Differences were also found in movement kinematics between the two throwing conditions and relationships were found between kinematics, velocity and accuracy.

No MeSH data available.


Experimental set.
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f1-jhk-46-39: Experimental set.

Mentions: Participants performed a specific warm up before the test. Afterwards, they performed four series of eight throws at seven metres distance from the goal. The throws were performed in a standing position with feet placed at shoulder width (30 cm between heels), and foot orientation was such that the vector formed by the heels was in a parallel position to the medial-lateral axis of both platforms (Caballero et al., 2013). Two of the four series were performed on a stable surface (floor) and the other two series were performed on an unstable surface (standard BOSU® balance trainer). The feet position during throwing was unchanged in both situations. To avoid progressive error, the series were counterbalanced and randomly assigned. The participants were asked to throw a standard handball (IHF size 3) at a target (40 cm × 40 cm square) located in the top right hand corner of the goal (Figure 1). To avoid fatigue effects on velocity and accuracy, the participants rested for five seconds between each throw and rested for five minutes between series. The number of throws performed should allow the assessment of velocity and accuracy characteristics due to the stability of the throw pattern in the specialization of the players (van den Tillaar and Ettema, 2003b). The instruction given to the participants was to “throw at the highest velocity and with the highest accuracy possible towards the target”.


Effects of Unstable Conditions on Kinematics and Performance Variables in Young Handball Players.

Urbán T, Gutiérrez Ó, Moreno FJ - J Hum Kinet (2015)

Experimental set.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519220&req=5

f1-jhk-46-39: Experimental set.
Mentions: Participants performed a specific warm up before the test. Afterwards, they performed four series of eight throws at seven metres distance from the goal. The throws were performed in a standing position with feet placed at shoulder width (30 cm between heels), and foot orientation was such that the vector formed by the heels was in a parallel position to the medial-lateral axis of both platforms (Caballero et al., 2013). Two of the four series were performed on a stable surface (floor) and the other two series were performed on an unstable surface (standard BOSU® balance trainer). The feet position during throwing was unchanged in both situations. To avoid progressive error, the series were counterbalanced and randomly assigned. The participants were asked to throw a standard handball (IHF size 3) at a target (40 cm × 40 cm square) located in the top right hand corner of the goal (Figure 1). To avoid fatigue effects on velocity and accuracy, the participants rested for five seconds between each throw and rested for five minutes between series. The number of throws performed should allow the assessment of velocity and accuracy characteristics due to the stability of the throw pattern in the specialization of the players (van den Tillaar and Ettema, 2003b). The instruction given to the participants was to “throw at the highest velocity and with the highest accuracy possible towards the target”.

Bottom Line: The execution variability and outcomes found in throwing actions have received special attention in numerous studies in recent years.Results showed significant decreases in throwing velocity in unstable conditions, but these did not significantly affect the accuracy achieved in performance.Differences were also found in movement kinematics between the two throwing conditions and relationships were found between kinematics, velocity and accuracy.

View Article: PubMed Central - PubMed

Affiliation: Sport Research Center. Miguel Hernández University of Elche, Elche-Alicante (Spain).

ABSTRACT
The execution variability and outcomes found in throwing actions have received special attention in numerous studies in recent years. The aim of this study was to analyze the effect of an unstable condition on velocity, accuracy and kinematics of movement in the seven metres throw in handball. Twenty-five young handball players took part in an experiment, throwing towards a target on a stable and an unstable surface. Each participant performed 32 throws, 16 for each situation. Linear variability of the dominant hand was assessed by 3D Motion Tracking. A radar sports gun was used to record the velocity of the ball and the throws were video recorded to establish their accuracy. Results showed significant decreases in throwing velocity in unstable conditions, but these did not significantly affect the accuracy achieved in performance. Differences were also found in movement kinematics between the two throwing conditions and relationships were found between kinematics, velocity and accuracy.

No MeSH data available.