By Topic

Time-variant spectral analysis of heart rate variability during parabolic flight with and without LBNP

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)

We investigated whether modifications of sympathetic and parasympathetic activity during parabolic flight could be detected using a time-variant model, able to estimate low (LF, 0.04-0.14 Hz) and high (HF, 0.14-0.35 Hz) frequency spectral components on a beat-to-beat basis. 10 subjects were studied with and without lower body negative pressure (LBNP, -50 mmHg). ECG signal and Gz load were digitized at 500 Hz and RR interval variability series were generated. Beat-to-beat estimates of mean RR, variance, absolute LF and HF power were obtained. One-way ANOVA was used to compare the values obtained during the different phases of parabolic flight sequence (I: initial 1 Gz, II: Initial 1.8 Gz, III: 0 Gz, IV: final 1.8 Gz, V: final 1 Gz), with p<0.01 assumed as significant. Without LBNP, total and LF power increased significantly during 0 Gz to 1.69±1.41 and 2.87±4.66 respectively (mean±SD, normalized by phase I value). With LBNP, the change in total and LF power during 0 Gz (1.38±1.37 and 1.54±1.04 respectively) reached significance only with phase II and phase V. Phase I HF power was higher than in the other phases, both without and with LBNP. During parabolic flight, parasympathetic activity was reduced with changes in Gz. LBNP reduced the sympathetic activation at 0 Gz.

Published in:

Engineering in Medicine and Biology, 2002. 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society EMBS/BMES Conference, 2002. Proceedings of the Second Joint  (Volume:3 )

Date of Conference:

23-26 Oct. 2002