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• W1988034861 abstract "The effect of prior exercise on pulmonary O 2 uptake (V̇o 2 p ) and estimated muscle capillary blood flow (Q̇ m ) kinetics during moderate-intensity, field-based running was examined in 14 young adult men, presenting with either moderately fast (16 s < τV̇o 2 p < 30 s; MFK) or very fast V̇o 2 p kinetics (τV̇o 2 p < 16 s; VFK) (i.e., primary time constant, τV̇o 2 p ). On four occasions, participants completed a square-wave protocol involving two bouts of running at 90–95% of estimated lactate threshold (Mod 1 and Mod 2 ), separated by 2 min of repeated supramaximal sprinting. V̇o 2 p was measured breath by breath, heart rate (HR) beat to beat, and vastus lateralis oxygenation {deoxy-hemoglobin/myoglobin concentration (deoxy-[Hb+Mb])} using near-infrared spectroscopy. Mean response time of Q̇ m (Q̇ m MRT) was estimated by rearranging the Fick equation, using V̇o 2 p and deoxy-[Hb+Mb] as proxies of muscle O 2 uptake (V̇o 2 ) and arteriovenous difference, respectively. HR, blood lactate concentration, total hemoglobin, and Q̇ m were elevated before Mod 2 compared with Mod 1 (all P < 0.05). τV̇o 2 p was shorter in VFK compared with MFK during Mod 1 (13.1 ± 1.8 vs. 21.0 ± 2.5 s, P < 0.01), but not in Mod 2 (12.9 ± 1.5 vs. 13.7 ± 3.8 s, P = 1.0). Q̇ m MRT was shorter in VFK compared with MFK in Mod 1 (8.8 ± 1.9 vs. 17.0 ± 3.4 s, P < 0.01), but not in Mod 2 (10.1 ± 1.8 vs. 10.5 ± 3.5 s, P = 1.0). During Mod 2 , HR kinetics were slowed, whereas mean deoxy-[Hb+Mb] response time was unchanged. The difference in τV̇o 2 p between Mod 1 and Mod 2 was related to Q̇ m MRT measured at Mod 1 ( r = 0.71, P < 0.01). Present results suggest that local O 2 delivery (i.e., Q̇ m ) may be a factor contributing to the V̇o 2 kinetic during the onset of moderate-intensity, field-based running exercise, at least in subjects exhibiting moderately fast V̇o 2 kinetics." @default.
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• W1988034861 date "2009-08-01" @default.
• W1988034861 modified "2023-10-18" @default.
• W1988034861 title "Effect of prior exercise on pulmonary O₂ uptake and estimated muscle capillary blood flow kinetics during moderate-intensity field running in men" @default.
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• W1988034861 doi "https://doi.org/10.1152/japplphysiol.91625.2008" @default.
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