Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

T-wave amplitude: relationships to phasic RSA and heart period changes

K P Kline1, G P Ginsburg, J R Johnston

  • 1Department of Psychology, University of Nevada, Reno 89557, USA.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|July 17, 1998
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Diseases whose causes are unknown.

Control de plagas·2010
Same author

Propofol sedation using Diprifusor target-controlled infusion in adult intensive care unit patients.

Anaesthesia·2004
Same author

Appraisals and impression management opportunities: person and situation influences on cardiovascular reactivity.

International journal of psychophysiology : official journal of the International Organization of Psychophysiology·2002
Same author

Use of methoxamine in the resuscitation of epinephrine-resistant electromechanical dissociation.

Anaesthesia·2001
Same author

Asking the gatekeepers: a national survey of judges on judging expert evidence in a post-Daubert world.

Law and human behavior·2001
Same author

Sociality effects on the production of laughter.

The Journal of general psychology·2001

T-Wave Amplitude (TWA) may indicate sympathetic nervous system activity. This study found TWA is not influenced by parasympathetic activity (respiratory sinus arrhythmia) but can be affected by heart rate during intense stress.

Area of Science:

  • Cardiology
  • Autonomic Nervous System Physiology
  • Heart Rate Variability

Background:

  • T-Wave Amplitude (TWA) is proposed as a marker for sympathetic cardiac influence.
  • Concerns exist that TWA may be affected by parasympathetic activity or tachycardia.
  • Clarifying TWA's relationship with autonomic control is crucial for its clinical application.

Purpose of the Study:

  • To investigate the influence of parasympathetic activity on T-Wave Amplitude (TWA).
  • To assess TWA's reliability as an indicator of sympathetic cardiac function under varying autonomic conditions.

Main Methods:

  • Examined TWA in relation to parasympathetic activity, measured by respiratory sinus arrhythmia (RSA) and interbeat intervals (IBI).
  • Utilized stressful tasks (Valsalva, Serial Subtraction, Cold-Pressor) in 16 male subjects.

Related Experiment Videos

  • Employed statistical methods to control for between-person variance.

    • Main Results:

    • Respiratory sinus arrhythmia (RSA) did not significantly contribute to TWA.
    • Interbeat intervals (IBI) showed a dependable contribution to TWA only during the Valsalva maneuver, characterized by very high heart rates.
    • Parasympathetic influence did not confound TWA under most tested conditions.

    Conclusions:

    • T-Wave Amplitude (TWA) remains a viable candidate for indicating sympathetic cardiac influence.
    • Caution is advised when interpreting TWA during periods of significantly elevated heart rate (tachycardia).
    • The study supports TWA's specificity to sympathetic activity, independent of parasympathetic modulation, except under extreme physiological stress.