Effects of pulmonary flow heterogeneity on oxygen transport parameters in exercise.
Effects of pulmonary flow heterogeneity on oxygen transport parameters in exercise.
复制标题
DOI:
10.1016/j.resp.2018.10.004
复制
发表时间:
2019-03
影响因子:
2.3
通讯作者:
Secomb TW
中科院分区:
文献类型:
--
作者:
Roy TK;Secomb TW
Under resting normoxic conditions, the healthy lung has ample oxygen uptake capacity relative to oxygen demand, but during exercise, increased oxygen demand and utilization become increasingly dependent on ventilation-perfusion matching. A mathematical model is used to investigate the effect of pulmonary flow heterogeneity, as characterized by the coefficient of variation (CV) of capillary blood flow, on pulmonary oxygen uptake in exercise. The model reveals that any level of heterogeneity up to a CV of 3 is consistent with the observed level of arterial oxygen tension under resting conditions, but that such high levels of heterogeneity are incompatible with the levels of oxygen uptake observed during exercise. If a normal diffusing capacity is assumed, the best fit to literature data on arterial oxygen content of exercising humans under normoxic and hypoxic conditions is found with a relatively low CV of 0.48, suggesting that local flow regulation mechanisms such as hypoxic pulmonary vasoconstriction play an important role in ventilation-perfusion matching during exercise.
登录
查看更多内容
影响因子:
3.3
作者:
Beck, Kenneth C.;Johnson, Bruce D.;Wilson, Theodore A.
通讯作者:
Wilson, Theodore A.
DOI:
10.1097/00005768-199805000-00009
发表时间:
1998-05-01
期刊:
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子:
--
作者:
Cardús, J;Marrades, RM;Wagner, PD
通讯作者:
Wagner, PD
DOI:
10.1152/ajpheart.1995.269.5.h1713
发表时间:
1995-11-01
影响因子:
4.8
作者:
PRIES, AR;SECOMB, TW;GAEHTGENS, P
通讯作者:
GAEHTGENS, P
DOI:
10.1016/s0034-5687(96)00086-2
发表时间:
1996-12-01
期刊:
RESPIRATION PHYSIOLOGY
影响因子:
--
作者:
Wagner, PD
通讯作者:
Wagner, PD
DOI:
10.1152/ajpheart.00131.2012
发表时间:
2012-07-01
影响因子:
4.8
作者:
Golub, Aleksander S.;Pittman, Roland N.
通讯作者:
Pittman, Roland N.