TY  - JOUR
A1  - Reiser, Mathias
A1  - Zentgraf, Karen
A1  - Kindermann, Stefan
A1  - Künzell, Stefan
T1  - An approach to quantify the float effect of float serves in indoor and beach volleyball
T2  - Frontiers in sports and active living
N2  - The float serve is an effective weapon to impede the attack of the opposing team. Because of its great importance in indoor and beach volleyball, we measured and quantified the float effect. We recorded 24 float serves of 12 top athletes in beach volleyball and indoor volleyball, respectively, and analyzed them using video analysis. We determined the 3D trajectories of the ball flight and developed two measures to describe the size of the float effect, the mean residuals and the anticipation error. Both were derived from regression models. These measures suggest that the float effect is greater in the vertical plane than in the horizontal plane, both for indoor and beach volleyball. Analyses of ball release velocities suggest that a certain ball release velocity is a necessary, but not sufficient, condition for ball floating. A validation of the float measurements with subjective expert ratings showed a correlation with the horizontal deviations. This study provides a new approach to analyze floating in on-court volleyball serves and broadens the knowledge for float effects in sports.
KW  - kinematics
KW  - motion analysis
KW  - biomechanics
KW  - sport
KW  - aerodynamics
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/56867
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-568675
SN  - 2624-9367
VL  - 2
IS  - Article 559277
PB  - Frontiers Media
CY  - Lausanne
ER  -