NDLI: Kinetics of VO2 limb blood flow and regional muscle deoxygenation in young adults during moderate intensity, knee-extension exercise

Content Provider	Springer Nature Link
Author	duMair, Gregory R. DeLorey, Darren S. Kowalchuk, John M. Paterson, Donald H.
Copyright Year	2009
Abstract	The kinetics of pulmonary O2 uptake $$ \left( {\dot{V}{{{\text{O}}_{{ 2\,{\text{p}}}} }} } \right), $$ limb blood flow (LBF) and deoxygenation (ΔHHb) of the vastus lateralis (VL) and vastus medialis (VM) muscles during the transition to moderate-intensity knee-extension exercise (MOD) was examined. Seven males (27 ± 5 years; mean ± SD) performed repeated step transitions (n = 4) from passive exercise to MOD. Breath by breath $$ \dot{V}{{{\text{O}}_{{ 2\,{\text{p}}}} }} , $$ femoral artery LBF, and VL and VM muscle ∆HHb were measured, respectively, by mass spectrometer and volume turbine, Doppler ultrasound and near-infrared spectroscopy. Phase 2 $$ \dot{V}{{{\text{O}}_{{ 2\,{\text{p}}}} }} , $$ LBF, and ∆HHb data were fit with a mono-exponential model. The time constant (τ) of the $$ \dot{V}{{{\text{O}}_{{ 2\,{\text{p}}}} }} $$ and LBF response were not different ( $$ \tau \dot{V}{{{\text{O}}_{{ 2\,{\text{p}}}} }} , $$ 24 ± 6 s; τLBF, 23 ± 8 s). The ∆HHb response did not differ between VL and VM in amplitude (VL 6.97 ± 4.22 a.u.; VM 7.24 ± 3.99 a.u.), time delay (∆HHbTD: VL 17 ± 2 s; VM 15 ± 1 s), time constant (τ∆HHb: VL 11 ± 6 s; VM 13 ± 4 s), or effective time constant [τ′∆HHb (= ∆HHbTD + τ∆HHb): VL 28 ± 7 s; VM 28 ± 4 s]. Adjustments in ∆HHb in VL and VM depict a similar balance of regional O2 delivery and utilization within the quadriceps muscle group. The τ′∆HHb and $$ \tau \dot{V}{{{\text{O}}_{{ 2\,{\text{p}}}} }} $$ were similar, however, the ∆HHb displayed an “overshoot” relative to the steady-state levels reflecting a slower alteration of microvascular blood flow (O2 delivery) relative to O2 utilization, necessitating a greater reliance on O2 extraction.
Starting Page	607
Ending Page	617
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	108
Issue Number	3
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-10-31
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oxygen uptake kinetics Femoral artery blood flow Doppler ultrasound Near-infrared spectroscopy Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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