Influence of type 2 diabetes on muscle deoxygenation during ramp incremental cycle exercise
Citation:
Gildea, N., Rocha, J., McDermott, A., O'Shea, D., Green, S., Egaña, M., Influence of type 2 diabetes on muscle deoxygenation during ramp incremental cycle exercise, Respiratory Physiology and Neurobiology, 2019, 269, 103258,Abstract:
We tested the hypothesis that type 2 diabetes (T2D) alters the profile of muscle fractional oxygen (O2) extraction (near-infrared spectroscopy) during incremental cycle exercise. Seventeen middle-aged individuals with uncomplicated T2D and 17 controls performed an upright ramp test to exhaustion. The rate of muscle deoxygenation (i.e. deoxygenated haemoglobin and myoglobin concentration, Δ[HHb+Mb]) profiles of the vastus lateralis muscle were normalised to 100% of the response, plotted against % power output (PO) and fitted with a double linear regression model. Peak oxygen uptake was significantly (P < 0.05) reduced in individuals with T2D. The %Δ[HHb+Mb]/%PO slope of the first linear segment of the double linear regression function was significantly (P < 0.05) steeper in T2D than controls (1.59 (1.14) vs 1.23 (0.51)). Both groups displayed a near-plateau in Δ[HHb+Mb] at an exercise intensity (%PO) not different amongst them. Such findings suggest that a reduced O2 delivery to active muscles is an important underlying cause of exercise intolerance during a maximum graded test in middle-aged individuals with T2D.
Author's Homepage:
http://people.tcd.ie/megana
Author: Egana, Mikel
Type of material:
Journal ArticleCollections
Series/Report no:
Respiratory Physiology and Neurobiology;269;
103258;
Availability:
Full text availableKeywords:
Type 2 diabetes, Near-infrared spectroscopy, Oxygen extraction, Cycling, Exercise toleranceDOI:
http://dx.doi.org/10.1016/j.resp.2019.103258Metadata
Show full item recordLicences: