Postautor: p_e_t_e » 29 lis 2004, 21:53
On both the forehand and backhand volleys the racket head was found to be slightly open at contact, however, in comparing the backswings, the rotation of the upper limb laid the racket more open on the backhand side. Although the racket head is slightly open, players should be careful not to dish the ball when volleying. Groppel found that players who “dish” the ball employ no racket head rotation prior to ball contact and that the dishing effect seen is usually a reaction to the impact; it is not a purposeful movement. As mentioned earlier, the forward swing involves a weight transfer which is initiated by the soleus, gastrocnemius, quadriceps and gluteals. Both forehand and backhand volleys typically utilize some trunk rotation (obliques and spinal erectors) although the backhand volley involves less trunk rotation. The forehand swing uses the anterior deltoid, pectorals, shoulder internal rotators, elbow flexors (biceps) and serratus anterior muscles in aconcentric (shortening) fashion. The backhand volley swing uses the rhomboids, and middle trapezius, posterior deltoid, middle deltoid, shoulder external rotators, triceps and serratus anterior, also concentrically.