NDLI: Analysis of cardio-pulmonary and respiratory kinetics in different body positions: impact of venous return on pulmonary measurements

Content Provider	Springer Nature Link
Author	Drescher, U. Koschate, J. Schiffer, T. Hoffmann, U.
Copyright Year	2016
Abstract	The aim of the study was to compare the kinetics responses of heart rate (HR), pulmonary ( $$\dot{V}$$ O2pulm), and muscular ( $$\dot{V}$$ O2musc) oxygen uptake during dynamic leg exercise across different body positions (−6°, 45°, and 75°).Ten healthy individuals [six men, four women; age 23.4 ± 2.8 years; height 179.7 ± 8.3 cm; body mass 73 ± 12 kg (mean ± SD)] completed pseudo-random binary sequence (PRBS) work rate (WR) changes between 30 and 80 W in each posture. HR was measured beat-to-beat by echocardiogram and $$\dot{V}$$ O2pulm by breath-by-breath gas exchange. $$\dot{V}$$ O2musc kinetics were assessed by the procedure of Hoffmann et al. (Eur J Appl Physiol 113:1745–1754, 2013) applying a circulatory model and cross-correlation functions (CCF).For $$\dot{V}$$ O2pulm kinetics significant differences between −6° (CCF-values: 0.292 ± 0.040) and 45° (0.256 ± 0.034; p < 0.01; n = 10) as well as between −6° and 75° (0.214 ± 0.057; p < 0.05; n = 10) were detected at lag ‘40 s’ of the CCF course as interaction effects (factors: Lag × Posture). HR and $$\dot{V}$$ O2musc kinetics yield no significant differences across the postures.The analysis of cardio-dynamic and respiratory kinetics, especially with an emphasis on muscular and cellular level, has to consider venous return and cardiac output distortions. Simplified observations of kinetics responses resulting in time constants and time delays only should be replaced by the time-series analysis for a more sophisticated evaluation. The results illustrate that isolated $$\dot{V}$$ O2pulm measurements without cardio-dynamic influences may not represent the kinetics responses originally revealed at muscular level.
Starting Page	1343
Ending Page	1353
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	116
Issue Number	7
e-ISSN	14396327
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-05-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Exercise Gas exchange Circulatory modeling Time-series analysis Posture Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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