caa a22 4500 469054182 CHVBK 20180323132838.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00602355 doi (NATIONALLICENCE)springer-10.1007/BF00602355 Influence of body position and pre-exercise activity on cardiac output and oxygen uptake following step changes in exercise intensity [Elektronische Daten] [D. Leyk, D. E\feld, U. Hoffmann, K. Baum, J. Stegemann] Summary: Parallel measurements of breath-by-breath oxygen uptake, cardiac output (Doppler technique), blood pressure (Finapres technique) and heart rate were performed in nine subjects during cycle ergometer exercise in the upright and supine positions. Transients were monitored during power steps starting from and leading to either rest or lower levels of exercise intensity. Oxygen uptake ( $$\dot V{\text{O}}_{\text{2}} $$ ) and cardiac output kinetics were markedly faster than in all other conditions when exercise was started from rest. In contrast to exercise-exercise on steps, the computed arteriovenous difference in O2 content increased almost immediately in this situation, indicating that not only the additional energy expenditure due to the acceleration of the flywheel but also an increased venous admixture from non-exercising parts of the body contributed to the early kinetics. The off kinetics generally showed a more uniform pattern and did not simply mirror the on transients. The present findings indicate that transitions from rest should be avoided when muscle $$\dot V{\text{O}}_{\text{2}} $$ kinetics are to be assessed on the basis of $$\dot V{\text{O}}_{\text{2}} $$ 2 measurements at the mouth. Springer-Verlag, 1992 Exercise nationallicence Humans nationallicence Oxygen uptake nationallicence Cardiac output nationallicence Transients nationallicence Leyk D. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut E\feld D. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut Hoffmann U. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut Baum K. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut Stegemann J. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/6(1992-11-01), 499-506 0301-5548 65:6<499 1992 65 421 https://doi.org/10.1007/BF00602355 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00602355 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Leyk D. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut NATIONALLICENCE 700 1- E\feld D. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut NATIONALLICENCE 700 1- Hoffmann U. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut NATIONALLICENCE 700 1- Baum K. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut NATIONALLICENCE 700 1- Stegemann J. Physiologisches Institut der Deutschen Sporthochschule Köln, Carl-Diem-Weg 6, W-5000, Cologne 41, Federal Republic of Germany aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/6(1992-11-01), 499-506 0301-5548 65:6<499 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer