article 2016 14 pages Assessment of Heart Rate Variability Thresholds from Incremental Treadmill Tests in Five Cross-Country Skiing Techniques Ibai Mendia-Iztueta, Kristen Monahan, Heikki Kyröläinen, Esa Hynynen JournalPLOS ONEDOI10.1371/journal.pone.0145875Publication typeResearch ArticlePopulationcompetitive skiers View on DOI ↗