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Purpose: We tested the hypothesis that incremental ramp cycling exercise performed in the supine position (S) would be associated with an increased reliance on muscle deoxygenation (deoxy[heme]) in the deep and superficial vastus lateralis (VLd and VLs, respectively) and the superficial rectus femoris (RFs) when compared to the upright position (U).
Methods: 11 healthy men completed ramp incremental exercise tests in S and U. Pulmonary [Formula: see text]O was measured breath-by-breath; deoxy[heme] was determined via time-resolved near-infrared spectroscopy in the VLd, VLs and RFs.
Results: Supine exercise increased the overall change in deoxy[heme] from baseline to maximal exercise in the VLs (S: 38 ± 23 vs. U: 26 ± 15 μM, P < 0.001) and RFs (S: 36 ± 21 vs. U: 25 ± 15 μM, P < 0.001), but not in the VLd (S: 32 ± 23 vs. U: 29 ± 26 μM, P > 0.05).
Conclusions: The present study supports that the impaired balance between O delivery and O utilization observed during supine exercise is a regional phenomenon within superficial muscles. Thus, deep muscle defended its O delivery/utilization balance against the supine-induced reductions in perfusion pressure. The differential responses of these muscle regions may be explained by a regional heterogeneity of vascular and metabolic control properties, perhaps related to fiber type composition.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8064998 | PMC |
| http://dx.doi.org/10.1007/s00421-021-04607-6 | DOI Listing |
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