Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, 227 Freer Hall MC-052, 906 South Goodwin Avenue, Urbana, IL 61801, USA.
Eur J Appl Physiol. 2012 Feb;112(2):735-41. doi: 10.1007/s00421-011-2033-x. Epub 2011 Jun 10.
This study examined standard echocardiographic measures of cardiac size and performance in response to a 3-h firefighting training exercise. Forty experienced male personnel completed a standardized 3 h live firefighting exercise. Before and after the firefighting activities, participants were weighed, height, heart rate, blood pressure and blood samples were obtained, and echocardiographic measurements were made. Firefighting produced significant decreases in left ventricular diastolic dimension, stroke volume, fractional shortening, and mitral E velocity, tachycardia, a rise in core temperature, and a reduction in calculated plasma volume. On tissue Doppler imaging, there were no changes in systolic contractile function, but a decreased lateral wall diastolic velocity was observed. These findings show that 3 h of live firefighting produced cardiac changes consistent with cardiac fatigue, coupled with a decrease in systemic arterial compliance. These data show that live firefighting produces significant cardiovascular changes and future work is needed to evaluate if these changes are related to the increase in cardiovascular risk during live firefighting.
本研究旨在探讨标准超声心动图测量指标在 3 小时消防训练后的心脏大小和功能变化。40 名有经验的男性人员完成了标准化的 3 小时现场消防训练。在消防活动前后，对参与者进行称重、测量身高、心率、血压和采集血液样本，并进行超声心动图测量。消防活动导致左心室舒张末期内径、心搏量、射血分数和二尖瓣 E 波速度降低，心率加快，核心体温升高，计算的血浆容量减少。在组织多普勒成像上，收缩期收缩功能没有变化，但观察到侧壁舒张速度降低。这些发现表明，3 小时的现场消防会导致与心脏疲劳一致的心脏变化，同时全身动脉顺应性降低。这些数据表明，现场消防会产生显著的心血管变化，需要进一步研究这些变化是否与现场消防期间心血管风险增加有关。
