Does the Use of a Light Discus Modify the Throwing Pattern? A Study of Kinematical and Electromyographical Data of the Throwing Arm

Daniel Dinu 1 Françoise Natta 1 Pierre Portero 2 Henry Vandewalle 3
1 INSEP - Institut national du sport, de l'expertise et de la performance
2 Hôpital Avicenne
3 Hôpital Rothschild
Abstract : Seven high-level discus throwers (best performance 57 ± 3 m) participated to the present study. During the same session, they performed 12 throws (6 with a 1.7 kg discus and 6 with a 2 kg discus) in a random order. The throwing distance was computed from the velocity vector (magnitude, direction, height) at ejection. Kinematical data were collected by means of 3 video-cameras and a 3-D modelling of the throwing movement was processed according to the DLT method. Surface electromyograms (sEMG) of 6 arm-and-shoulder muscles of the throwing arm [Biceps brachii; Pectoralis major; Deltoideus pars superior; Trapezius pars medialis; Deltoideus pars medialis; Latissimus dorsi] were recorded by means of a portable device. Thereafter, sEMG was integrated (iEMG) and related to the iEMG recorded during a maximal effort against an external resistance. Computed distance with a light discus was significantly longer and was the result of a faster discus speed at ejection. This was probably the result of an enhanced increase in discus velocity during the last throwing phase (Δt2da). There was no significant difference in the duration of the four preceding phases with 1.7 kg compared to 2 kg discus. The total duration of the throwing movement was not significantly different between 1.7 and 2 kg discus. The EMG patterns of the different muscles were similar with both discuses when the beginning and the end of the muscle activity were considered. There was no significant difference between discuses when iEMG was summated on the whole throwing movement and related to the iEMG previously recorded during a maximal effort. These results suggest that the lighter discus might be used for high level training without kinematical alteration of throwing.
Keywords : throwing technique. electromyography modelling Discus throwing Kinematics
Type de document :
Chapitre d'ouvrage
Liste complète des métadonnées

Littérature citée [6 références]  Voir  Masquer  Télécharger
https://hal-insep.archives-ouvertes.fr/hal-01869781
Contributeur : Documentation Insep <>
Soumis le : jeudi 6 septembre 2018 - 17:45:38
Dernière modification le : jeudi 4 avril 2019 - 10:54:02
Document(s) archivé(s) le : vendredi 7 décembre 2018 - 22:09:05

Fichier

Does the use of a light discus...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

INSEP

Citation

Daniel Dinu, Françoise Natta, Pierre Portero, Henry Vandewalle. Does the Use of a Light Discus Modify the Throwing Pattern? A Study of Kinematical and Electromyographical Data of the Throwing Arm. Margaret Estivalet, Pierre Brisson. The Engineering of Sport 7, 2, Springer, pp.689-694, 2008, ⟨10.1007/978-2-287-09413-2_82⟩. ⟨hal-01869781⟩

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

283

Téléchargements de fichiers

79

Contact hal-insep@insep.fr | Portail documentaire Insep http://www.sportdocs.insep.fr | Site web Insep http://www.insep.fr | Contact support CCSD hal.support@ccsd.cnrs.fr