The role of upper limb segment rotations in the development of racket-head speed in the squash forehand

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Bibliographische Detailangaben
Deutscher übersetzter Titel:Die Bedeutung der Rotationen der Armsegmente fuer die Entwicklung der Schlaegerkopfgeschwindigkeit beim Squash-Vorhandschlag
Autor:Elliott, Bruce; Marshall, Robert; Noffal, Guillermo
Erschienen in:Journal of sports sciences
Veröffentlicht:14 (1996), 2, S. 159-165, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource
Sprache:Englisch
ISSN:0264-0414, 1466-447X
Schlagworte:
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Erfassungsnummer:PU199605107917
Quelle:BISp

Abstract des Autors

In the squash forehand drive, the contribution that each of the upper limb segment's anatomical rotations make to racket-head velocity towards the front wall (x-direction) during the forward swing and at impact were calculated. Eight squash players (3 females, 5 males) capable of hitting a high-performance squash forehand drive were filmed at a nominal rate of 300 Hz by two phase-locked Photosonics cameras. The three-dimensional displacement histories of 12 selected landmarks were then calculated using the direct linear transformation approach and three-dimensional individual segment rotations were calculated using vector equations. Internal rotation of the upper arm at the shoulder joint (46.1%), hand flexion at the wrist joint (18.2%) and forearm pronation at the radio-ulnar joint (12.0%) were the major contributors to the mean 30.8 m/s x-direction velocity of the centre of the racket-head at impact. Pronation of the forearm at the radio-ulnar joint and extension at the elbow joint both played a significant role in generating racket velocity in the period prior to impact. Verf.-Referat