measuring exhaustion response example using vagal variance n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Measuring Exhaustion Response: Example using Vagal Variance PowerPoint Presentation
Download Presentation
Measuring Exhaustion Response: Example using Vagal Variance

Loading in 2 Seconds...

play fullscreen
1 / 16

Measuring Exhaustion Response: Example using Vagal Variance - PowerPoint PPT Presentation


  • 71 Views
  • Uploaded on

Measuring Exhaustion Response: Example using Vagal Variance. Sean Collins. Evidence of Reduced Vagal Cardiac Control Variability in Exhausted Subjects & High Strain Job Subjects. Purpose :

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Measuring Exhaustion Response: Example using Vagal Variance' - ora


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2
Evidence of Reduced Vagal Cardiac Control Variability in Exhausted Subjects & High Strain Job Subjects
  • Purpose:
    • Present methods and propose hypotheses to test a component of the Stress Disequilibrium Theory based on “Regulatory System Variance”
  • HRV Project Background
    • Regulatory System Variance
  • HRV Project Methods
    • Determination of Exhausted Subjects
    • Repeated measures ANOVA
regulatory system variance strain exhaustion hypothesis
Regulatory System Variance: Strain & Exhaustion Hypothesis
  • High Frequency Variance components of HRV reflect Vagal system activity
  • Vagal system is a regulator of the cardiac system
  • Vagal system variance reflects Vagal system capacity to adapt to regulatory demands: Regulatory System Variance – i.e. Ashby’s Requisite Variety
  • Reduced Control (High Strain) & Exhaustion may lead to a reduction in Vagal system regulatory capacity – and therefore reduced Regulatory System Variance
determination of exhausted subjects
Determination of Exhausted Subjects
  • Job Content Questionnaire Exhaustion Items
    • Unusually tired in the morning
    • End of the day, completely exhausted mentally and physically
      • “Most of the time” response required for both items
  • Four subjects reached pre-determined criteria for “exhaustion”
    • 3 “exhausted subjects – high strain jobs
  • Hybrid methodology
regulatory system variance controlled controlled relationship
Regulatory System Variance – Controlled / Controlled Relationship

System Regulation

HFP Time Series

(Vagal Control)

4 Hours (= 48 Epochs)

Beat-to-Beat Variability

RR Interval Series

5 – Minutes

Frequency Analysis – HFP (.15-.4 Hz)

1 Epoch

slide6

Line of Identity

Poincaré Plot for Entire Monitoring Period

discussion
Discussion

Limitations

  • Sample size
  • Linkage between Reduced Regulatory Variance and disease
  • Identification of Reduced Regulatory Variance indicating reduced adaptive capacity
discussion1
Discussion

Preliminary evidence of:

  • Reduced regulatory system variance of the vagal system in exhausted subjects during the workday that lasts into the hours following work
  • Reduced regulatory system variance of the vagal system in high strain subjects that seems to drop significantly during recovery hours
  • Clearly requires further study