The aim of this study was to establish the validity of a video analysis software package in measuring mean propulsive velocity (MPV) and the maximal velocity during bench press. Twenty-one healthy males (21 +/- 1 year) with weight training experience were recruited and the MPV and the maximal velocity of the concentric phase (Vmax) were compared to a linear position transducer system during a standard bench press exercise. Participants performed a one repetition maximum (1RM) test using the supine bench press exercise. The testing procedures involved the simultaneous assessment of bench press propulsive velocity using two kinematic (linear position transducer and semi-automated tracking software) systems. High Pearson[spacing acute] correlation coefficients for MPV and Vmax between both devices (r = .473 to .993) were observed. The intraclass correlation coefficients (ICCs) for barbell velocity data and the kinematic data obtained from video analysis were high (>0.79). In addition, the low coefficients of variation indicate that measurements had low variability. Finally, Bland-Altman plots with the limits of agreement of the MPV and Vmax with different loads showed a negative trend which indicated that the video analysis had higher values than the linear transducer. In conclusion, this study has demonstrated that the software employed for the video analysis was an easy to use and cost-effective tool with a very high degree of concurrent validity. This software can be used to evaluate changes in velocity of raining load in resistance training which may be important for the prescription and monitoring of training programmes.
Copyright (C) 2014 by the National Strength & Conditioning Association.