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- W2006421568 abstract "During muscular work, microvascular Po2 (Po2m) falls rapidly in a monoexponential fashion, while the recovery profile of Po2m follows a slower, double exponential pattern (McDonough et al., Exp. Physiol., 86(3): 349–356, 2001). Whether this on-off asymmetry is due to factors associated with fiber type, oxidative capacity or some combination of the two is not known. PURPOSE: To test the hypothesis that muscle fiber type and oxidative capacity will influence Po2m dynamics during the on- and off-transient from muscular contractions in the soleus (S: predominantly type I fibers; citrate synthase activity (CS): 20.7 μmol/min/g), mixed (MG: type II; CS: 25.7) and white gastrocnemius (WG: type II; CS: 8.1) muscles. METHODS: The hindlimb musculature of 10 female Sprague-Dawley rats (wt = 220g) was exposed, following which, either the S, MG or WG was electrically stimulated (1 Hz). Po2m dynamics were measured using phosphorescence quenching techniques. RESULTS: For the same delta Po2m, the on-transient response exhibited a marked fiber type dependency. Specifically, the MRT was significantly greater for S (S: 43.9 ± 2.3s) compared to either MG (27.8 ± 7.2s) or WG (19.8 ± 3.6s), which were not different. The off-transient response however demonstrated a significant dependency upon oxidative capacity, as the MRT was significantly greater for WG (155.2 ± 29.8s) compared to S (52.8 ± 5.4s) or MG (51.9 ± 19.8), which were not different. CONCLUSION: These data suggest that asymmetries in Po2m dynamics are both fiber type and oxidative capacity dependent. Supported by: NIH HL-50306 and HL-67619-01" @default.
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- W2006421568 date "2002-05-01" @default.
- W2006421568 modified "2023-09-27" @default.
- W2006421568 title "THE INFLUENCE OF FIBER TYPE AND OXIDATIVE CAPACITY ON LOCOMOTORY MUSCLE MICROVASCULAR PO2 KINETICS" @default.
- W2006421568 doi "https://doi.org/10.1097/00005768-200205001-00618" @default.
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