Reliability and Validity of the New Shooting Accuracy Measurement (SAM) System Software

The aim of this study was to investigate the reliability and validity of the New Shooting Accuracy Measurement Software (SAMS). Thirty two male collegian soccer players performed three inner side kicking to the transparent goal construction. A High speed camera was placed at the back of the construction to determine where the ball contacted. Recorded video results were assessed with the SAMS and Kinovea software. To investigate test-retest reliability, three kicking results were examined twice by SAMS. Moreover kicking accuracy results obtained with SAMS were compared with results provided by Kinovea in order to investigate validity. Test-retest reproducibility of the new software was excellent, with Concordance Correlation Coefficient for distance to target (0.99, 0.99 and 0.99 respectively) and for angular degree of the ball (0.97, 0.99 and 0.99 respectively), low Coefficients of Variation (between 2.10 to 6.33 for distance to target and 2.40 to 2.69 for angular degree) and random error (between 0.55 to 3.44 for distance to target and 0.63 to 2.75 for angular degree). Constant error (between 0.44 to 1.28 for distance to target and -1.16 to -2.51 for angular degree) and proportional error (between 0.97 to 0.98 for distance to target and 1.00 to 1.01 for angular degree) were very low for validity. In conclusion, the SAMS represents a valid and reliable instrument to measure accuracy of shooting to target.