PTJ Test 12.4 | Page 20

FEATURE ARTICLE LIMITATIONS OF GLOBAL POSITIONING SYSTEMS ON THE TRAINING AND TESTING EFFECTS OF CYCLING CHRISTOPHER MYERS, MS, TSAC-F, USA CYCLING LEVEL 2 COACH, USA SWIMMING LEVEL 2 COACH he introduction of global positioning system (GPS) technology has increased the efficiency and detail of the metrics used for testing in training for the sport of cycling. For elite cyclists, GPS provides data on terrain, speed, and elevation to enhance power and heart rate data. However, GPS data alone is a very weak source to use for testing and training metrics. Combining this technology with other cycling metrics with the right analysis software, the cyclist can predict his relative VO2 and respiratory expiration ratio (RER) to improve training and subsequent performance. T 20