Oxygen uptake kinetics during supra V·O 2max treadmill running in humans

CARTER, HELEN, Pringle, J.S.M., Barstow, T.J. and DOUST, JONATHAN (2006) Oxygen uptake kinetics during supra V·O 2max treadmill running in humans International Journal of Sports Medicine, 27 (2). pp. 149-157. ISSN 0172-4622

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Official URL: https://www.thieme-connect.de/DOI/DOI?10.1055/s-20...

Abstract

Accurate classification of VO2 kinetics is essential to correctly interpret its control mechanisms. The purpose of this study was to examine VO2 kinetics in severe and supra-maximal intensity running exercise using two modelling techniques. Nine subjects (mean +/- S.D: age, 27 +/- 7 years; mass, 69.8 +/- 9.0 kg; VO2max, 59.1 +/- 1.8 mL x kg x min(-1)) performed a series of "square-wave" exercise transitions to exhaustion at running speeds equivalent to 80% of the difference between the VO2 at LT and VO2max (delta), and at 100%, 110% and 120% VO2max. The VO2 response was modelled with an exponential model and with a semi-logarithmic transformation, the latter assuming a certain steady state VO2. With the exponential model there was a significant reduction in the "gain" of the primary component in supra-maximal exercise (167 +/- 5 mL x kg(-1) x km(-1) at 80% delta to 142 +/- 5 mL x kg(-1) x km(-1) at 120% VO2max, p = 0.005). The time constant of the primary component also reduced significantly with increasing intensity (17.8 +/- 1.1 s at 80% delta to 12.5 +/- 1.2 s at 120% VO2max, p < 0.05). However, in contrast, using the semi-log model, the time constant significantly increased with intensity (30.9 +/- 13.5 s at 80% delta to 72.2 +/- 23.9 s at 120% VO2max, p < 0.05). Not withstanding the need for careful interpretation of mathematically modelled data, these results demonstrate that neither the gain nor the time constant of the VO2 primary component during treadmill running are invariant across the severe and supra-maximal exercise intensity domains when fit with an exponential model. This suggests the need for a reappraisal of the VO2/work rate relationship in running exercise.

Item Type:Journal article
Uncontrolled Keywords:Oxygen uptake kinetics; vo2max; training; sport and exercise science; human vo2 kinetics; sport science
Subjects:B000 Health Professions > B100 Anatomy Physiology and Pathology > B120 Physiology
B000 Health Professions > B100 Anatomy Physiology and Pathology > B160 Biomechanics
B000 Health Professions > B100 Anatomy Physiology and Pathology > B190 Anatomy, Physiology and Pathology not elsewhere classified
C000 Biological and Biomedical Sciences > C600 Sport and Exercise Science
B000 Health Professions > B100 Anatomy Physiology and Pathology
C000 Biological and Biomedical Sciences
DOI (a stable link to the resource):10.1055/s-2005-873076
ID Code:1536
Deposited By:Converis
Deposited On:09 Jan 2013 08:13
Last Modified:22 Nov 2013 16:31

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