caa a22 4500 469055855 CHVBK 20180323132843.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00717952 doi (NATIONALLICENCE)springer-10.1007/BF00717952 The respiratory system as an exercise limiting factor in normal sedentary subjects [Elektronische Daten] [Urs Boutellier, Paul Piwko] Summary: The present study was undertaken to investigate the respiratory system as an exercise limiting factor. Breathing and cycle endurance (i.e. the time until exhaustion at a given performance level) as well as physical working capacity 170 (i.e. the exercise intensity corresponding to a heart rate of 170 beats -min−1 on a cycle ergometer) were determined in four healthy sedentary subjects. Subsequently, the subjects trained their respiratory system for 4 weeks by breathing daily about 901 · min−1 for 30 min. Otherwise they continued their sedentary lifestyle. Immediately after the respiratory training and 18 months later, all performance tests carried out at the beginning of the study were repeated. The respiratory training increased breathing endurance from 4.2 (SD 1.9) min to 15.3 (SD 3.8) min. Cycle endurance was improved from 26.8 (SD 5.9) min to 40.2 (SD 9.2) min whereas physical working capacity 170 remained essentially the same. During the endurance cycling test in the respiratory untrained state, the subjects continuously increased their ventilation up to hyperventilation [ventilation at exhaustion = 96.9 (SD 23.6) 1 · min−1] while after the respiratory training they reached a respiratory steady-state without hyperventilation [ventilation at exhaustion = 63.3 (SD 14.5) 1 · min−1]. The absence of this marked hyperventilation was the cause of the impressive increase of cycle endurance in normal sedentary subjects after respiratory training. The effects gained by the respiratory training were completely lost after 18 months. Our results indicated that the respiratory system was an exercise limiting factor during an endurance test in normal sedentary subjects. Springer-Verlag, 1992 Exercise limiting factor nationallicence Respiratory muscle training nationallicence Breathing endurance nationallicence Cycle endurance nationallicence Physical working capacity 170 nationallicence Boutellier Urs Department of Physiology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland aut Piwko Paul Department of Physiology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/2(1992-03-01), 145-152 0301-5548 64:2<145 1992 64 421 https://doi.org/10.1007/BF00717952 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00717952 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Boutellier Urs Department of Physiology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland aut NATIONALLICENCE 700 1- Piwko Paul Department of Physiology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/2(1992-03-01), 145-152 0301-5548 64:2<145 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 469054573 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer