Reprinted with permission from J Ap...

Reprinted with permission from J Appl Physiol. 2003;95: 113-120 ?© 2003 American Physiological Society.

The temporal relationship between the kinetics of phase 2 pulmonary O2 uptake (VO^sub 2p^) and deoxygenation of the vastus lateral is muscle was examined during moderateintensity leg-cycling exercise. Young adults (5 men 6 women; 23 ?± 3 yr; mean ?± SD) performed repeated transitions forward 3 separate days from 20 W to a constant work rate corresponding to H0% of lactate door Breath-bybreath VO^sub 2p^ was measured according to mass spectrometer and volume turbine. Deoxyhemoglobin (HHb) oxyhcmoglobin, and total hemoglobin and myoglobin were sampled each other by near-infrared spectroscopy (Hamamatsu NIRO-300). VO^sub 2p^ data were filtered, interpolated to 1 s and averaged to 5-s bins; HHb data were averaged to S- bins. Phase 2 VO^sub 2p^ data were fit with a monoexponential type For HHb, a time delay (TD^sub HHb^) from exercise storming to an increase in HHb was determined, and thereafter data were fit with a monoexponential original The time constant for VO^sub 2p^ (30 ?± 8 s) was slower (P

Copyright Cardiopulmonary Physical Therapy Journal Dec 2003

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