CARDIAC-PERFORMANCE IN HUMANS DURING BREATH HOLDING
CARDIAC-PERFORMANCE IN HUMANS DURING BREATH HOLDING
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DOI：
10.1152/jappl.1986.60.6.1871
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发表时间：
1986-06-01
影响因子：
3.3
通讯作者：
LUNDGREN, CEG
中科院分区：
文献类型：
--
作者：
FERRIGNO, M;HICKEY, DD;LUNDGREN, CEG
研究了在大肺容量和小肺容量下屏气引起的高胸内压和低胸内压对心脏性能的影响。心脏指数和收缩时间间期记录从六个休息的主题与阻抗心动图在非浸泡和浸泡条件。热中性环境（空气28 ° C）。C，水35. C）用于消除潜水反应中冷诱导的循环成分。与非浸泡相比，浸泡期间心脏性能增强，而在大肺容量下屏气则会降低心脏性能。从心脏指数的降低（浸没条件下为24.1%，非浸没条件下为20.9%）和收缩时间间隔的变化（例如，左室射血时间缩短伴射血前期延长。在没有冷水成分的潜水反应，屏气潜水员使用的大肺容量屏气往往会降低心脏性能，可能是通过阻碍静脉回流。
The effects on cardiac performance of high and low intrathoracic pressures induced by breath holding at large and small lung volumes have been investigated. Cardiac index and systolic time intervals were recorded from six resting subjects with impedance cardiography in both the nonimmersed and immersed condition. A thermoneutral environment (air 28.degree. C, water 35.degree. C) was used to eliminate the cold-induced circulatory component of the diving response. Cardiac performance was enhanced during immersion compared with nonimmersion, whereas it was depressed by breath holding at large lung volume. The depressed performance was apparent from the decrease in cardiac index (24.1% in the immersed and 20.9% in the nonimmersed condition) and from changes in systolic time intervals, e.g., shortening of left ventricular ejection time coupled with lengthening of preejection period. In the absence of the cold water component of the diving response, breath holding at the large lung volume used by breath-hold divers tends to reduce cardiac performance presumably by impeding venous return.