Glenohumeral contact force during flat and topspin tennis forehand drives

Abstract : 12 The primary role of the shoulder joint in tennis forehand drive is at the expense of the 13 loadings undergone by this joint. Nevertheless, few studies investigated glenohumeral (GH) 14 contact forces during forehand drives. The aim of this study was to investigate GH 15 compressive and shearing forces during the flat and topspin forehand drives in advanced 16 tennis players. 3D kinematics of flat and topspin forehand drives of 11 advanced tennis 17 players were recorded. The Delft Shoulder and Elbow musculoskeletal model was 18 implemented to assess the magnitude and orientation of GH contact forces during the 19 forehand drives. The results showed no differences in magnitude and orientation of GH 20 contact forces between the flat and topspin forehand drives. The estimated maximal GH 21 contact force during the forward swing phase was 3573 ± 1383 N, which was on average 1.25 22 time greater than during the follow-through phase, and 5.8 times greater than during the 23 backswing phase. Regardless the phase of the forehand drive, GH contact forces pointed 24 toward the anterior-superior part of the glenoid therefore standing for shearing forces. 25 Knowledge of GH contact forces during real sport tasks performed at high velocity may 26 improve the understanding of various sport-specific adaptations and causative factors for 27 shoulder problems. 28 2 29
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Yoann Blache, Thomas Creveaux, Raphaël Dumas, Laurence Cheze, Isabelle Rogowski. Glenohumeral contact force during flat and topspin tennis forehand drives. Sports Biomechanics, Taylor & Francis (Routledge): SSH Titles, 2017, 16 (1), pp.127 - 142. ⟨10.1080/14763141.2016.1216585⟩. ⟨hal-01926636⟩

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