caa a22 4500 469054573 CHVBK 20180323132839.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF00868139 doi (NATIONALLICENCE)springer-10.1007/BF00868139 The respiratory system as an exercise limiting factor in normal trained subjects [Elektronische Daten] [Urs Boutellier, Ramon Büchel, Andreas Kundert, Christina Spengler] Summary: Recently, we have shown that an untrained respiratory system does limit the endurance of submaximal exercise (64% peak oxygen consumption) in normal sedentary subjects. These subjects were able to increase breathing endurance by almost 300% and cycle endurance by 50% after isolated respiratory training. The aim of the present study was to find out if normal, endurance trained subjects would also benefit from respiratory training. Breathing and cycle endurance as well as maximal oxygen consumption ( $$\dot VO_{2 max} $$ ) and anaerobic threshold were measured in eight subjects. Subsequently, the subjects trained their respiratory muscles for 4 weeks by breathing 85-1601 · min−1 for 30 min daily. Otherwise they continued their habitual endurance training. After respiratory training, the performance tests made at the beginning of the study were repeated. Respiratory training increased breathing endurance from 6.1 (SD 1.8) min to about 40 min. Cycle endurance at the anaerobic threshold [77 (SD 6) % $$\dot VO_{2 max} $$ ] was improved from 22.8 (SD 8.3) min to 31.5 (SD 12.6) min while $$\dot VO_{2 max} $$ and the anaerobic threshold remained essentially the same. Therefore, the endurance of respiratory muscles can be improved remarkably even in trained subjects. Respiratory muscle fatigue induced hyperventilation which limited cycle performance at the anaerobic threshold. After respiratory training, minute ventilation for a given exercise intensity was reduced and cycle performance at the anaerobic threshold was prolonged. These results would indicate the respiratory system to be an exercise limiting factor in normal, endurance trained subjects. Springer-Verlag, 1992 Respiratory muscle training nationallicence Breathing endurance nationallicence Cycle endurance nationallicence Maximal oxygen consumption nationallicence Anaerobic threshold nationallicence Boutellier Urs Department of Physiology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland aut Büchel Ramon Exercise Physiology Research Unit, Swiss Federal Institute of Technology, Winterthurerstrasse 143, CH-8057, Zürich, Switzerland aut Kundert Andreas Exercise Physiology Research Unit, Swiss Federal Institute of Technology, Winterthurerstrasse 143, CH-8057, Zürich, Switzerland aut Spengler Christina Department of Physiology, University of Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/4(1992-07-01), 347-353 0301-5548 65:4<347 1992 65 421 https://doi.org/10.1007/BF00868139 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00868139 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- Büchel Ramon Exercise Physiology Research Unit, Swiss Federal Institute of Technology, Winterthurerstrasse 143, CH-8057, Zürich, Switzerland aut NATIONALLICENCE 700 1- Kundert Andreas Exercise Physiology Research Unit, Swiss Federal Institute of Technology, Winterthurerstrasse 143, CH-8057, Zürich, Switzerland aut NATIONALLICENCE 700 1- Spengler Christina 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 65/4(1992-07-01), 347-353 0301-5548 65:4<347 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 469054573 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer