Samenvatting
A three-dimensional kinematical analysis of the handball jump shot, using the finite helical axis (FHA) approach.
Ben Serrien & Jean-Pierre Baeyens: VUB - BIOM
Introduction: An important phenomenon in throwing performance is proximal to distal (P-D) sequencing in which the larger segments (pelvis and trunk) need to develop the momentum which can then be transferred to the smaller segments (throwing arm). This has implications for the throwing performance and for injury prevention. The problem with P-D sequencing is that it can be defined in various manners. Therefore the aim of this study was to investigate if there is a P-D sequence and if yes, which kind of P-D sequence there is in a handball jump shot.
Methods: In this study, 17 male handball players from Topsportschool Hasselt participated. For the tracking of the 35 reflective markers, an optoelectronic VICON-system was used with 7 camera's. Computation of the helical angles was done in Mathcad and data were smoothed in MATLAB. We used the FHA approach to describe segmental rotations for pelvis, trunk, upper thorax and humerus, because this has more advantages over the classic Euler/Cardan convention; e.g. avoidance of gimbal lock and no rotation sequence effect. Throwing phase classification was done according to Wagner et al1. In throwing mechanics, there is a high movement variability, which makes it difficult to detect differences between players with a high or low ball release speed. Because of this reason and because of the features of the FHA approach, we introduced ratios of kinematic variables to account for this problem.
Results: The main findings of this study was that players threw in a P-D sequence in terms of initiation of joint movement, but not in terms of maximal angular velocity or maximal angles. Two important ratios were endorotation upper thorax vs. endorotation trunk and endorotation upper thorax vs. endorotation pelvis. For both ratios we found significantly higher values (p <0.5) for players classified as fast throwers, which indicates a better P-D sequencing technique.
Discussion: Our results confirm the hypothesis of van den Tillaar & Ettema2 that in handball throwing, there is only a P-D sequence in terms of initiation of joint movement but not in terms of maximal joint velocity or maximal angles.
References:
1 Wagner H. et al. (2010) Journal of Sports Science and Medicine 30, 760-765
2 van den Tillaar, R., & Ettema, G. (2009). Journal of Sport Sciences , 27(9): 949-955.
Ben Serrien & Jean-Pierre Baeyens: VUB - BIOM
Introduction: An important phenomenon in throwing performance is proximal to distal (P-D) sequencing in which the larger segments (pelvis and trunk) need to develop the momentum which can then be transferred to the smaller segments (throwing arm). This has implications for the throwing performance and for injury prevention. The problem with P-D sequencing is that it can be defined in various manners. Therefore the aim of this study was to investigate if there is a P-D sequence and if yes, which kind of P-D sequence there is in a handball jump shot.
Methods: In this study, 17 male handball players from Topsportschool Hasselt participated. For the tracking of the 35 reflective markers, an optoelectronic VICON-system was used with 7 camera's. Computation of the helical angles was done in Mathcad and data were smoothed in MATLAB. We used the FHA approach to describe segmental rotations for pelvis, trunk, upper thorax and humerus, because this has more advantages over the classic Euler/Cardan convention; e.g. avoidance of gimbal lock and no rotation sequence effect. Throwing phase classification was done according to Wagner et al1. In throwing mechanics, there is a high movement variability, which makes it difficult to detect differences between players with a high or low ball release speed. Because of this reason and because of the features of the FHA approach, we introduced ratios of kinematic variables to account for this problem.
Results: The main findings of this study was that players threw in a P-D sequence in terms of initiation of joint movement, but not in terms of maximal angular velocity or maximal angles. Two important ratios were endorotation upper thorax vs. endorotation trunk and endorotation upper thorax vs. endorotation pelvis. For both ratios we found significantly higher values (p <0.5) for players classified as fast throwers, which indicates a better P-D sequencing technique.
Discussion: Our results confirm the hypothesis of van den Tillaar & Ettema2 that in handball throwing, there is only a P-D sequence in terms of initiation of joint movement but not in terms of maximal joint velocity or maximal angles.
References:
1 Wagner H. et al. (2010) Journal of Sports Science and Medicine 30, 760-765
2 van den Tillaar, R., & Ettema, G. (2009). Journal of Sport Sciences , 27(9): 949-955.
| Originele taal-2 | English |
|---|---|
| Titel | Proceedings 17e VK-symposium: "Via bewegingsonderzoek naar bewegingsbeleid". |
| Redacteuren | Bas De Geus |
| Plaats van productie | Vrije Universiteit Brussel |
| Status | Published - 7 dec 2012 |
| Evenement | 17de VK‐symposium - Brussels, Belgium Duur: 7 dec 2012 → 7 dec 2012 |
Conference
| Conference | 17de VK‐symposium |
|---|---|
| Land/Regio | Belgium |
| Stad | Brussels |
| Periode | 7/12/12 → 7/12/12 |