Abstract: A method of processing data representing the performance of a tennis player in a display device includes: a) calculating, using data including physical quantities measured during a game period including one or several game sessions and transferred into a system for calculating of the display device, at least three parameters representing the player's performance during this game period, b) displaying, in the form of a diagram including one axis for each parameter, with the axes forming a star with several branches, points corresponding to the values of the parameters on the axes so as to form a generally polygon-shaped closed contour encompassing or passing through the points, and c) alternatively increasing and decreasing the surface area delimited by the closed contour according to a frequency of the variation calculated according to the effective game time of the player measured during the last game session of the game period.

Abstract: Method for calculating a parameter (P) representing a tennis player's technical level during a series of strokes includes: a) determining, for each executed stroke, an impact zone of the stroke on the stringed zone of a tennis racquet used by the player; b) determining, for each executed stroke, the type of stroke, with the type being chosen from a list including at least two type of strokes; c) using the impact zones determined in step a) and types of strokes determined in step b) for the series of strokes, determining a zone index for each type of stroke; d) using the zone indexes calculated in step c), calculating the parameter value, using the following formula: P = ? i = 1 C ? Zi × Ni ? i = 1 C ? Ni where C is the number of stroke types, Zi, with i between 1 and C, is the zone index, and Ni is the number of strokes executed per type of stroke i.

Abstract: A method for calculating a repeatability index of gestures and shots of a player striking a tennis ball with a racket having attached measurement sensors. The method includes conducting an initial series of shots to measure vibration, angular velocity, and linear acceleration of the racket during each shot to generate behavioral data of the racket corresponding to each shot of the initial series, and later comparing the measured vibration, angular velocity and linear acceleration of the racket to shots of a further series to determine the type of hit and a repeatability index indicating an ability of the player to identically repeat each of the type of hit.

Abstract: A tennis racket includes a head including a frame surrounding a netting of string, a holding handle (2), a vibration sensor (14.1), a triaxial linear acceleration sensor (14.2), and a triaxial angular speed sensor (14.3).

Abstract: Method for calculating a parameter (P) representing a tennis player's technical level during a series of strokes includes: a) determining, for each executed stroke, an impact zone of the stroke on the stringed zone of a tennis racquet used by the player; b) determining, for each executed stroke, the type of stroke, with the type being chosen from a list including at least two type of strokes; c) using the impact zones determined in step a) and types of strokes determined in step b) for the series of strokes, determining a zone index for each type of stroke; d) using the zone indexes calculated in step c), calculating the parameter value, using the following formula: P = ? i = 1 C ? Zi × Ni ? i = 1 C ? Ni where C is the number of stroke types, Zi, with i between 1 and C, is the zone index, and Ni is the number of strokes executed per type of stroke i.

Abstract: A method of processing data representing the performance of a tennis player in a display device includes: a) calculating, using data including physical quantities measured during a game period including one or several game sessions and transferred into a system for calculating of the display device, at least three parameters representing the player's performance during this game period, b) displaying, in the form of a diagram including one axis for each parameter, with the axes forming a star with several branches, points corresponding to the values of the parameters on the axes so as to form a generally polygon-shaped closed contour encompassing or passing through the points, and c) alternatively increasing and decreasing the surface area delimited by the closed contour according to a frequency of the variation calculated according to the effective game time of the player measured during the last game session of the game period.

Abstract: Method for calculating a parameter representing a tennis player's endurance during a game period including a series of game sessions, includes: a) measuring the linear acceleration and angular speed of the racket during each stroke hit by the player, b) calculating the power developed by the player during each stroke using linear accelerations and angular speeds measured in step a); c) calculating the player's average power defined as the average of power levels developed during each stroke calculated in step b); d) calculating the energy expended by the player during the last game session, the energy expended being equal to the number of strokes executed during the session multiplied by the average power calculated in step c) raised to a predetermined power, e) calculating the parameter, defined by the product of the number of game sessions per week during the game period, multiplied by the energy calculated in step d).

Abstract: The racket includes a handle (2) and a frame (4) defined by an inner frame (40) and an outer frame (42), said frame further including shock-absorbing means (50) positioned between the peripheral outer surface of the inner frame and the peripheral inner surface of the outer frame. The frame further includes at least one fitting member (60) having an elongate body (62) and extending against the outer surface of the outer frame (42), and at least one tube (66) for passing a string yarn (10, 12), extending both in first openings (40?) formed in the inner frame and in second openings (42?) formed in the outer frame.

Abstract: This method for calculating a repeatability index of gestures and shots of a player striking a tennis ball with a racket, includes: a preliminary step a) in which behavioural data of the racket are generated during tests, the behavioural data indicating first playing data, related to gestures and shots as a function of parameters including at least several types of hits, a playing step b) in which second playing data are measured; an analysis step c) in which: the second playing data are compared with the behavioural data, the type of hit is deduced for each shot made in the playing step b), and for each type of hit, the value of the repeatability index of the player's gestures and shots is determined by comparing the second playing data with each other.

Abstract: The racket includes a handle (2) and a frame (4) defined by an inner frame (40) and an outer frame (42), said frame further including shock-absorbing means (50) positioned between the peripheral outer surface of the inner frame and the peripheral inner surface of the outer frame. The frame further includes at least one fitting member (60) having an elongate body (62) and extending against the outer surface of the outer frame (42), and at least one tube (66) for passing a string yarn (10, 12), extending both in first openings (40?) formed in the inner frame and in second openings (42?) formed in the outer frame.