naa a22 4500 510805949 CHVBK 20180411083418.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s12576-012-0249-0 doi (NATIONALLICENCE)springer-10.1007/s12576-012-0249-0 About the use and conclusions extracted from a single tube snorkel used for respiratory data acquisition during swimming [Elektronische Daten] [Ricardo Fernandes, Pedro Figueiredo, João Vilas-Boas] Pinna et al. (J Physiol Sci, 10.1007/s12576-012-0226-7, 2012) showed that a tethered swimming incremental protocol leads to higher maximal oxygen consumption values than during cycle ergometer and arm-crank tests, and evidenced that anaerobic threshold occurred at higher workloads during swimming comparing to other types of exercise. This is an interesting study in the field of exercise physiology applied to swimming that deserves merit once: (1) it employs direct gas exchange measurements during swimming, a rather hard task due to the characteristics of the water environment and the usual constraints imposed by the evaluation equipment, and (2) the physiologic comparison between swimming, running, cycling, and arm-cranking is complex, confirming that laboratory testing procedures are inadequate to estimate maximal oxygen consumption, maximal heart rate, and anaerobic threshold in swimming. However, in this Letter to the Editor, we would like to evidence some points that, in our opinion, are underdeveloped and not sufficiently clear, principally the incomplete description of the new breathing snorkel used, the non-reference to previous studies that used other snorkel models and obtained relevant data on oxygen uptake in swimming, and the assumption that swimmers uses less muscle mass when swimming than when running and cycling. The Physiological Society of Japan and Springer Japan, 2013 Fernandes Ricardo Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Rua Plácido Costa 91, 4200, Porto, Portugal aut Figueiredo Pedro Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Rua Plácido Costa 91, 4200, Porto, Portugal aut Vilas-Boas João Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Rua Plácido Costa 91, 4200, Porto, Portugal aut The Journal of Physiological Sciences Springer Japan 63/2(2013-03-01), 155-157 1880-6546 63:2<155 2013 63 12576 https://doi.org/10.1007/s12576-012-0249-0 text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12576-012-0249-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fernandes Ricardo Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Rua Plácido Costa 91, 4200, Porto, Portugal aut NATIONALLICENCE 700 1- Figueiredo Pedro Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Rua Plácido Costa 91, 4200, Porto, Portugal aut NATIONALLICENCE 700 1- Vilas-Boas João Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Rua Plácido Costa 91, 4200, Porto, Portugal aut NATIONALLICENCE 773 0- The Journal of Physiological Sciences Springer Japan 63/2(2013-03-01), 155-157 1880-6546 63:2<155 2013 63 12576 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer