Department of Nutrition, Exercise and Sports, University of Copenhagen, Denmark. Institute of BioEconomy (IBE) - National Research Council c/o Area di Ricerca di Firenze, Italy; Centre of Bioclimatology - University of Florence, Italy. Institute of BioEconomy (IBE) - National Research Council c/o Area di Ricerca di Firenze, Italy; Centre of Bioclimatology - University of Florence, Italy; Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence (UNIFI), Italy. Epidemiology Unit, Central Tuscany Local Health Unit, Italy. Department of Automatics, Biocybernetics, and Robotics, Jožef Stefan Institute, Slovenia; FAME Laboratory, Department of Exercise Science, University of Thessaly, Greece. Department of Automatics, Biocybernetics, and Robotics, Jožef Stefan Institute, Slovenia. Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Slovenia. Department of Nutrition, Exercise and Sports, University of Copenhagen, Denmark; TNO, The Netherlands Organization for Applied Scientific Research, Unit Defence, Safety & Security, The Netherlands. Federal Office of Meteorology and Climatology MeteoSwiss, Switzerland; Meteorology Group, Dept. Applied Mathematics and Computer Sciences, University of Cantabria, Spain. Federal Office of Meteorology and Climatology MeteoSwiss, Switzerland. Environmental Ergonomics Research Centre, School of Design and Creative Arts, Loughborough University, UK. SIMTECH Laboratory, Transport Phenomena Research Centre, Engineering Faculty of Porto University, Portugal. FAME Laboratory, Department of Exercise Science, University of Thessaly, Greece. Department of Nutrition, Exercise and Sports, University of Copenhagen, Denmark. Electronic address: nybo@nexs.ku.dk.