Pole length affects O2-cost and performance in double poling - Losnegard, T.; Myklebust, H.; Skattebo, O.; Stadheim, H. K.; Sandbakk, O.; Hallén, J. (3rd International Congress on Science and Nordic Skiing - ICSNS 2015. 5-8 June 2015, Vuokatti, Finland, 2015)