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Skip search results from other journals and go to results- 1 JMIR Research Protocols
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When confronted with a stressor, the sympathetic nervous system activates physiological processes frequently referred to as the fight or flight response [8]. The increase in sympathetic nervous system activity is reflected by a shorter pre-ejection period (the length of time between the contraction of the heart and the ejection of blood out of the heart into the aorta), corresponding with a higher heart rate [9].
JMIR Res Protoc 2020;9(9):e19881
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