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Int J Sports Med 2016; 37(07): 516-524
DOI: 10.1055/s-0042-101413
Physiology & Biochemistry
© Georg Thieme Verlag KG Stuttgart · New York

Muscular Oxygen Uptake Kinetics in Aged Adults

J. Koschate
1   Institute of Physiology and Anatomy, German Sport University Cologne, Cologne, Germany
,
U. Drescher
1   Institute of Physiology and Anatomy, German Sport University Cologne, Cologne, Germany
,
K. Baum
1   Institute of Physiology and Anatomy, German Sport University Cologne, Cologne, Germany
,
S. Eichberg
2   Institute of Sport Gerontology, Cologne, German Sport University Cologne, Cologne, Germany
,
T. Schiffer
3   Outpatient Clinic for Sports Traumatology and Public Health Consultation, German Sport University Cologne, Cologne, Germany
,
J. Latsch
4   Institute of Cardiovascular Research and Sports Medicine, Department of Preventive and Rehabilitative Sport Medicine, German Sport University Cologne, Cologne, Germany
,
K. Brixius
5   Institute of Cardiovascular Research and Sport Medicine, Department of Molecular and Cellular Sport Medicine, Cologne, Germany
,
U. Hoffmann
1   Institute of Physiology and Anatomy, German Sport University Cologne, Cologne, Germany
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Publikationsverlauf



accepted after revision 01. Dezember 2015

Publikationsdatum:
26. April 2016 (online)

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Abstract

Pulmonary oxygen uptake (V˙O2) kinetics and heart rate kinetics are influenced by age and fitness. Muscular V˙O2 kinetics can be estimated from heart rate and pulmonary V˙O2. In this study the applicability of a test using pseudo-random binary sequences in combination with a model to estimate muscular V˙O2 kinetics was tested. Muscular V˙O2 kinetics were expected to be faster than pulmonary V˙O2 kinetics, slowed in aged subjects and correlated with maximum V˙O2 and heart rate kinetics. 27 elderly subjects (73±3 years; 81.1±8.2 kg; 175±4.7 cm) participated. Cardiorespiratory kinetics were assessed using the maximum of cross-correlation functions, higher maxima implying faster kinetics. Muscular V˙O2 kinetics were faster than pulmonary V˙O2 kinetics (0.31±0.1 vs. 0.29±0.1 s; p=0.004). Heart rate kinetics were not correlated with muscular or pulmonary V˙O2 kinetics or maximum V˙O2. Muscular V˙O2 kinetics correlated with maximum V˙O2 (r=0.35; p=0.033). This suggests, that muscular V˙O2 kinetics are faster than estimates from pulmonary V˙O2 and related to maximum V˙O2 in aged subjects. In the future this experimental approach may help to characterize alterations in muscular V˙O2 under various conditions independent of motivation and maximal effort.

Key word

exercise capacity - pseudo-random binary sequences - cardiorespiratory kinetics
 

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