Dynamic response of the Initial Systolic Time Interval to a breathing stimulus measured with impedance cardiography
作者： Jan H Meijer , Femke Hoekstra , Esther Habers , Ruud M Verdaasdonk , Thomas W J Janssen
DOI: 10.1088/1742-6596/224/1/012119
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摘要: The Initial Systolic Time Interval (ISTI) is a measure for the time delay between electrical and mechanical activity of heart. present study reports about dynamic response ISTI to Valsalva manoeuvre. This was investigated in 22 young healthy volunteers, having different levels training sports. course during manoeuvre found follow distinct pattern be analogous Pre-Ejection Period (PEP), also obtained from ECG ICG signals, reported earlier. recordings show definite influence Frank-Starling mechanism are some extent consistent with on sympathetic activation. highly trained subjects showed an that systematically longer at all moments
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