TY - JOUR
AU - WHIPP, BRIAN J.
AB - BRIAN J. WHIPP, PH.D., D.Sc. ABSTRACT Power outputs that are below the anerobic threshold (Oan) may be sustained for pro- longed durations, whereas power outputs that are greater than oan result in a significant reduction in the tolerable duration to fatigue. The Oan may therefore be considered to demarcate exercise intensity into moderate (below) and heavy (above) domains. 02 uptake (V02) responds with linear first-order dynamics for sub-Oan power outputs with a time constant of 25 to 35 sec and a "delay" of 15 to 20 sec. A steady state is therefore normally achieved within 3 min. For supra-0an exercise an additional, slower component of VO. delays the steady state (if attainable). This slow phase of the V02 response to values above the steady-state level attainable by fitter subjects at that work causes the to rise VO2 The magnitude of this "excess" VO. correlates highly with the increased arterial blood lactate rate. [L-] and becomes marked when [L-] exceeds 4 to 5 meq/liter. The oan may therefore be considered a crucial for sustainable physical activity that is not - or is modestly fatiguing. index VI-18, 1987. Circulation 76(suppl VI), A is of a work 1, the energy provision from 
TI - Dynamics of pulmonary gas exchange
JO - Circulation
DA - 1987-12-01
UR - https://www.deepdyve.com/lp/wolters-kluwer-health/dynamics-of-pulmonary-gas-exchange-zF0HJQe5bJ
SP - -
VL - 76
IS - 
DP - DeepDyve
ER -