Theeffects ofbreathing He-02mixtures onmaximaloxygen consumption innormoxic andhypoxic men
Theeffects ofbreathing He-02mixtures onmaximaloxygen consumption innormoxic andhypoxic men
复制标题
呼吸 He-02 混合物对常氧和缺氧男性最大耗氧量的影响
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
F. Esposito
中科院分区：
文献类型：
--
作者：
F. Esposito
对氧气流量(RV)的通风阻力(RV)确实限制了低氧时的最大氧气消耗量(T4%，max)，但在常氧下不限制，至少在非运动受试者中，这一假设得到了检验。用He-02混合气降低RV。在常氧(吸入氧分(FiO2)=0‘21)和低氧(FI，O，=0~11)条件下，对8名男性(年龄30±3岁)呼吸N_2-02和He-02混合气时的I、2max进行了测量。测定各负荷稳态时的氧耗量、呼气量和肺泡通气量(VE和VA)、血乳酸和血红蛋白浓度、心率和动脉血氧饱和度(Sa，02)。测定静息状态和最大负荷结束时动脉血氧分压和二氧化碳分压(分别为Pa02和PaCO2)。常氧下吸入He-02后，VA显著增加(分别为+27%和+18%)，而Pa02、S、o和VO、max无明显变化。低氧时VE和VA分别增加(+31%和+24%)，Tao增加(+17%)，8aO2增加(+6%)，Vo增加2max(+14%)。限制正常血氧。重视He-02
The hypothesis that the ventilatory resistance to 02 flow (Rv) does limit maximal 02 consumption (T4%,max) in hypoxia, but not in normoxia, at least in non-athletic subjects, was tested. RV was reduced by using He-02 mixtures. I,2 max was measured during graded cyclo-ergometric exercise in eight men (aged 30 + 3 years) who breathed N2-02 and He-02 mixtures in normoxia (inspired oxygen fraction (FIo2) = 0'21) and hypoxia (FI,O, = 0-11). 02 consumption, expired and alveolar ventilations (VE and VA, respectively), blood lactate and haemoglobin concentrations, heart rate and arterial oxygen saturation (Sa,02) were determined at the steady state of each work load. Arterial 02 and CO2 partial pressures (Pa,02 and Pa,co2, respectively) were measured at rest and at the end of the highest work load. and VA significantly increased by He-02 breathing in normoxia (+27 and +18%, respectively), without significant changes in Pa,02, S,o, and VO,max. In hypoxia, VE and VA increased (+31 and +24%, respectively), together with taO, (+17%), 8aO2 (+6%) and Vo,2max (+14%). limiting normoxia. values He-02
气体交换和外周扩散限制。
影响因子：
4.1
作者：
Wagner,PD
通讯作者：
Wagner,PD
运动马通过氦气呼吸降低肺泡-动脉 PO2 差异的机制。
DOI：
10.1152/jappl.1994.76.6.2794
发表时间：
1994
期刊：
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子：
--
作者：
Erickson,BK;Seaman,J;Kubo,K;Hiraga,A;Kai,M;Yamaya,Y;Wagner,PD
通讯作者：
Wagner,PD