@article{ref1,
title="Effect of the September 11, 2001 terrorist attack on a state highway patrol trooper's heart rate variability",
journal="Annals of noninvasive electrocardiology",
year="2005",
author="Riediker, Michael and Herbst, Margaret C. and Devlin, Robert B. and Griggs, Thomas R. and Bromberg, Philip A. and Cascio, Wayne E.",
volume="10",
number="1",
pages="83-85",
abstract="BACKGROUND: On September 11, 2001, terrorists attacked the United States. By coincidence, a North Carolina highway patrol trooper was wearing an ambulatory ECG Holter monitor at this time as part of an air pollution study. METHODS: Heart rate variability parameters were analyzed: standard deviation of normal to normal beat intervals (SDNN) and percentage of interval differences >50 ms (PNN50). RESULTS: The trooper's heart rate variability changed immediately after learning about the terrorist attacks. Heart rate increased and PNN50 decreased, while SDNN increased strongly. CONCLUSIONS: These changes suggest strong emotional sympathetic stress associated with parasympathetic withdrawal in response to the news about the terrorist attack.<p /><p>Language: en</p>",
language="en",
issn="1082-720X",
doi="10.1111/j.1542-474X.2005.00612.x",
url="http://dx.doi.org/10.1111/j.1542-474X.2005.00612.x"
}