By Joe J. Tjandra, Per Renstrom, Per A. F. H. Renstr?m
This addition to the instruction manual sequence will enable the tennis trainer, athlete, and health care provider answerable for their care to enhance strategy, education and function, and to lessen the danger of harm. while harm does happen, Tennis will reduction speedy exact analysis and remedy, and potent rehabilitation in order that the tennis participant can go back to top functionality with the minimal of fuss.
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Additional resources for Tennis: Olympic Handbook of Sports Medicine
21 Preparation All players used a grip similar to the semi-western method of holding the racket for both topspin and backspin forehand strokes. Modifications to the positioning of the wrist permitted the angle of the racket to be changed at impact for the two strokes. The backswing The upper arm is positioned further from the trunk at the completion of the backswing in the backspin stroke (approx. 60') than in the topspin technique [approx. The greater hip and trunk rotation required in the topspin stroke is the major reason for the racket being positioned approximately 25" (total rotation of 205") past a line drawn perpendicular to the back fence for this stroke, while it is only rotates 50" [total rotation of 140') from a position parallel to the net for the backspin stroke.
5. Note that a large change in racket mass results in very little change in outgoing ball speed. All of this is assuming that the initial racket speed does not change when the racket is made heavier or lighter. If the racket head speed changes there is a large change in ball speed. Therefore, if changing the racket weight results in a change in racket head speed, there also will be a change in ball speed. However, as smaller racket weight should lead to higher head speed, decreasing the racket weight can often lead to higher ball speed.
At impact, the hitting limb lowers in the backspin shot (knee and hip joints were flexing: Fig. 15~1, while it raises in the topspin stroke (extension at knee and hip joints: Fig. 1 . 1 4 ~ )The . lower limb movements therefore assist the racket in its high-to-low (backspin) and low-to-high trajectories (topspin). Forward trunk lean and shoulder angle (approx. 70° and 55", respectively) at impact are similar for the two strokes. However, minor variations are evident in elbow and wrist angles. The elbow joint does not change during impact for the backspin stroke (approx.