%0 Journal Article %T Spatial-temporal variables for swimming coaches: A comparison study between video and TritonWear sensor %+ Fédération Française de Natation (FFN) %+ Institut de recherche biomédicale et d’épidémiologie du sport (IRMES - URP_7329) %+ Institut national du sport, de l'expertise et de la performance (INSEP) %+ Centre d’études des transformations des activités physiques et sportives (CETAPS) %+ Centre d'Investigation en Médecine du sport (CIMS) %+ Université Paris Descartes - Paris 5 (UPD5) %A Pla, Robin %A Ledanois, Thibaut %A Simbana, Escobar David %A Aubry, Anaël %A Tranchard, Benjamin %A Toussaint, Jean-François %A Sedeaud, Adrien %A Seifert, Ludovic %< avec comité de lecture %@ 1747-9541 %J International journal of Sports Science and Coaching %I Multi-Science Publishing %V 16 %N 6 %P 1271-1280 %8 2021-12 %D 2021 %R 10.1177/17479541211013755 %K Swimming Performance %K Spatial - temporal variability %K Wearable sensor %K Training load monitoring %Z Humanities and Social Sciences/Sport/Sport engineering and technology %Z Humanities and Social Sciences/Sport %Z Engineering Sciences [physics]Journal articles %X The main aim of this study was to evaluate the validity and the reliability of a swimming sensor to assess swimming performance and spatial-temporal variables. Six international male open-water swimmers completed a protocol which consisted of two training sets: a 6×100m individual medley and a continuous 800 m set in freestyle. Swimmers were equipped with a wearable sensor, the TritonWear to collect automatically spatial-temporal variables: speed, lap time, stroke count (SC), stroke length (SL), stroke rate (SR), and stroke index (SI). Video recordings were added as a “gold-standard” and used to assess the validity and the reliability of the TritonWear sensor. The results show that the sensor provides accurate results in comparison with video recording measurements. A very high accuracy was observed for lap time with a mean absolute percentage error (MAPE) under 5% for each stroke (2.2, 3.2, 3.4, 4.1% for butterfly, backstroke, breaststroke and freestyle respectively) but high error ranges indicate a dependence on swimming technique. Stroke count accuracy was higher for symmetric strokes than for alternate strokes (MAPE: 0, 2.4, 7.1 & 4.9% for butterfly, breaststroke, backstroke & freestyle respectively). The other variables (SL, SR & SI) derived from the SC and the lap time also show good accuracy in all strokes. The wearable sensor provides an accurate real time feedback of spatial-temporal variables in six international open-water swimmers during classical training sets (at low to moderate intensities), which could be a useful tool for coaches, allowing them to monitor training load with no effort. %G English %L hal-03829495 %U https://insep.hal.science//hal-03829495 %~ SHS %~ APHP %~ COMUE-NORMANDIE %~ INSEP %~ UNIROUEN %~ IRIHS %~ CETAPS %~ UNIV-PARIS %~ UNIVERSITE-PARIS %~ UP-SANTE %~ ANR