Validity and Reliability of GPS for Measuring Instantaneous Velocity During Acceleration, Deceleration, and Constant Motion

Varley M.C., Fairweather I.H., Aughey R.J.

Purpose: This study aims to evaluate the validity and reliability of Global Positioning System (GPS)-derived measurements of instantaneous velocity, acceleration, and deceleration during constant motion.

Methods: Athletes performed controlled constant motion activities while wearing GPS devices. Instantaneous velocity, acceleration, and deceleration were derived from GPS data. A criterion measure, such as motion capture or radar, was used to assess validity. Reliability was determined through repeated measures and expressed using intraclass correlation coefficients (ICC) and coefficient of variation (CV).

Results: Validity analyses compared GPS-derived measurements with criterion measures. Reliability was assessed through repeated measures of GPS data during constant motion. ICC and CV were calculated to quantify reliability across multiple trials.

Conclusion: GPS-derived measurements of instantaneous velocity, acceleration, and deceleration show promising validity and reliability during constant motion activities. These findings support the use of GPS technology for assessing athlete performance in real-world scenarios requiring constant motion.