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• W2111982809 abstract "A previous study (Grassi B, Gladden LB, Samaja M, Stary CM, and Hogan MC, J Appl Physiol 85: 1394–1403, 1998) showed that convective O 2 delivery to muscle did not limit O 2 uptake (V˙o 2 ) on-kinetics during transitions from rest to contractions at ∼60% of peakV˙o 2 . The present study aimed to determine whether this finding is also true for transitions involving contractions of higher metabolic intensities.V˙o 2 on-kinetics were determined in isolated canine gastrocnemius muscles in situ ( n = 5) during transitions from rest to 4 min of electrically stimulated isometric tetanic contractions corresponding to the muscle peakV˙o 2 . Two conditions were compared: 1) spontaneous adjustment of muscle blood flow (Q˙) (Control) and 2) pump-perfused Q˙, adjusted ∼15–30 s before contractions at a constant level corresponding to the steady-state value during contractions in Control (Fast O 2 Delivery). In Fast O 2 Delivery, adenosine was infused intra-arterially. Q˙ was measured continuously in the popliteal vein; arterial and popliteal venous O 2 contents were measured at rest and at 5- to 7-s intervals during the transition. Muscle V˙o 2 was determined as Q˙times the arteriovenous blood O 2 content difference. The time to reach 63% of the V˙o 2 difference between resting baseline and steady-state values during contractions was 24.9 ± 1.6 (SE) s in Control and 18.5 ± 1.8 s in Fast O 2 Delivery ( P < 0.05). FasterV˙o 2 on-kinetics in Fast O 2 Delivery was associated with an ∼30% reduction in the calculated O 2 deficit and with less muscle fatigue. During transitions involving contractions at peak V˙o 2 , convective O 2 delivery to muscle, together with an inertia of oxidative metabolism, contributes in determining theV˙o 2 on-kinetics." @default.
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• W2111982809 date "2000-10-01" @default.
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• W2111982809 title "Role of convective O₂ delivery in determiningV˙<scp>o</scp> ₂ on-kinetics in canine muscle contracting at peak V˙<scp>o</scp> ₂" @default.
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• W2111982809 doi "https://doi.org/10.1152/jappl.2000.89.4.1293" @default.
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