Key result
Cycling exercise transitions showed an initial unmodified muscle oxygenation time delay of 8.9s below and 6.4s above the ventilatory threshold, indicating adequate O2 availability.
Observational (n=10)
Constant muscle oxygenation during the initial phase of exercise on-transition indicates a tight coupling between increases in O2 delivery and O2 utilization, suggesting adequate O2 availability.
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Supports O2 delivery-utilization coupling at exercise onset in healthy adults; leaves open relevance to clinical or trained populations.
Grassi et al. (2003) conducted an observational in Healthy untrained (n=10). Cycling exercise transitions vs. Below vs above ventilatory threshold (<VT vs >VT) was evaluated on Muscle oxygenation index (changes in deoxygenated hemoglobin + myoglobin concentration) and pulmonary O2 uptake kinetics. Cycling exercise transitions showed an initial unmodified muscle oxygenation time delay of 8.9s below and 6.4s above the ventilatory threshold, indicating adequate O2 availability.
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