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Related Experiment Video

Updated: Nov 12, 2025

Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy

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Association between O₂ kinetics and O_2max in groups differing in fitness status.

Erin Calaine Inglis¹, Danilo Iannetta¹, Juan M Murias²

¹Faculty of Kinesiology, University of Calgary, KNB 434, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada.

European Journal of Applied Physiology

|March 17, 2021

Summary

Fitness status impacts oxygen uptake kinetics. Untrained individuals show slower oxygen uptake adjustment, suggesting peripheral O2 delivery limitations rather than central cardiovascular constraints.

Keywords:

HR Maximal oxygen uptake Moderate-intensity exercise Q̇

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Area of Science:

Exercise Physiology
Cardiovascular Function
Metabolic Response

Background:

Oxygen uptake (O₂) kinetics reflect the dynamic adjustment of O₂ utilization during exercise.
Understanding the relationship between O₂ kinetics, maximal O₂ (O_2max), and cardiovascular function is crucial for assessing exercise capacity.
Fitness status significantly influences physiological responses to exercise.

Purpose of the Study:

To evaluate the relationship between O₂ kinetics and O_2max across different fitness levels.
To compare the adjustment of O₂ kinetics with central (cardiac output, heart rate) and peripheral (muscle deoxygenation) oxygen delivery during moderate-intensity exercise transitions.

Main Methods:

Thirty-six young healthy males (18 untrained, 18 trained) underwent ramp-incremental tests and step-transitions to moderate-intensity exercise.
Measurements included O₂ kinetics, maximal O₂ (O_2max), cardiac output (Q̇), heart rate (HR), and muscle deoxygenation ([HHb]/O₂ ratio.
O₂ kinetics (τO₂), Q̇ kinetics (τQ̇), and HR kinetics (τHR) were determined.

Main Results:

A significant negative correlation between O₂ kinetics and O_2max was observed in untrained and all participants, but not in trained individuals.
In trained participants, cardiac output and heart rate kinetics were significantly faster than O₂ kinetics.
Untrained participants exhibited a significant overshoot in the [HHb]/O₂ ratio, indicating potential limitations in peripheral oxygen delivery.

Conclusions:

Higher maximal oxygen uptake (O_2max) does not always correlate with faster oxygen uptake (O₂) kinetics, particularly in trained individuals.
Central cardiovascular factors (cardiac output, heart rate) do not appear to limit the speed of O₂ kinetics.
Slower O₂ kinetics in untrained individuals may be attributed to limitations in oxygen delivery within the active muscles.