1 Laboratory of Signal Processing 5, Swiss Federal School of Technology (EPFL), Lausanne, Switzerland.
2 Digital Signal Processing Group, Department of Informatics, University of Oslo, Oslo, Norway.
3 Department of Neuromedicine and Movement Science, Centre for Elite Sports Research, Norwegian University of Science and Technology, Trondheim, Norway.
4 Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland.