1 Kuopio Research Institute of Exercise Medicine, Kuopio, Finland; Occupational and Environmental Medicine, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden. Electronic address: benno.krachler@envmed.umu.se.
2 Kuopio Research Institute of Exercise Medicine, Kuopio, Finland; Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital, Kuopio, Finland.
3 Kuopio Research Institute of Exercise Medicine, Kuopio, Finland; Institute of Biomedicine/Physiology, University of Eastern Finland, Kuopio, Finland.