Quentin Ladetto

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New Global Positioning System (GPS) receivers allow now to measure a location on earth at high frequency (5Hz) with a centimetric precision using phase differential positioning method. We studied whether such technique was accurate enough to retrieve basic parameters of human locomotion. Eight subjects walked on an athletics track at four different imposed(More)
When satellite signals are available, the localisation of a pedestrian is fairly straightforward. However, in cities or indoors, dead reckoning systems are necessary. Our current research focuses on the development of algorithms for pedestrian navigation in both post-processing and real-time modes. Experience shows that the main source of error in position(More)
Activity monitors based on accelerometry are used to predict the speed and energy cost of walking at 0% slope, but not at other inclinations. Parallel measurements of body accelerations and altitude variation were studied to determine whether walking speed prediction could be improved. Fourteen subjects walked twice along a 1.3km circuit with substantial(More)
PURPOSE This descriptive article illustrates the application of Global Positioning System (GPS) professional receivers in the field of locomotion studies. The technological challenge was to assess the external mechanical work in outdoor walking. METHODS Five subjects walked five times during 5 min on an athletic track at different imposed stride frequency(More)
A new GPS/video system that tracks skiers' position, their 100-kilometer-per-hour speed, and heart rate now gives the athletes, their coaches, and television viewers a novel performance analysis tool. The GPS data quantifies video motion analysis and enables evaluation of a skier's performance and technique from startgate to finish. A heart-rate monitoring(More)
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