The use of meta analysis to update the whole body vibration stressor effects within imprint
Download
1 / 18

The use of Meta-analysis to update the whole-body vibration stressor effects within IMPRINT - PowerPoint PPT Presentation


  • 72 Views
  • Uploaded on

The use of Meta-analysis to update the whole-body vibration stressor effects within IMPRINT. Gareth Conway James Szalma MIT 2 Lab, University of Central Florida. Whole-body vibration (WBV) effects on performance. Why is it a problem?

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 ' The use of Meta-analysis to update the whole-body vibration stressor effects within IMPRINT' - rosie


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
The use of meta analysis to update the whole body vibration stressor effects within imprint

The use of Meta-analysis to update the whole-body vibration stressor effects within IMPRINT

Gareth Conway

James Szalma

MIT2 Lab, University of Central Florida

MIT2 Lab, UCF


Whole body vibration wbv effects on performance
Whole-body vibration (WBV) effects on performance stressor effects within IMPRINT

  • Why is it a problem?

  • Enemies do not confront US forces directly – moved from the battlefield to urban environments. Hit and then go to ground and/or blend in with the population

  • Need to utilize technological advantages in the areas of mobility and information

  • The US Army has the advantage, but…

MIT2 Lab, UCF


Wbv effects on performance the soldier s perspective
WBV effects on performance – the Soldier’s perspective stressor effects within IMPRINT

On in-vehicle display units:

“the screens are almost impossible to read during periods of WBV and usually require the driver to stop to enable reading or precision data entry”.

On weapons systems:

“Vibrations created by firing a round from a tank or howitzer often creates momentary disorientation….. Targets often have to be re-acquainted and engagement decisions re-established”.

“Extensive WBV makes even the simplest task extremely difficult”.

MIT2 Lab, UCF


A few questions answers
A few Questions & Answers stressor effects within IMPRINT

What is it?

  • “A mechanical wave, that transfers energy but no matter” (Mansfield, 2004).

    Who does it affect?

  • Anyone supported by a vibrating surface

    What does is it affect (intuitively)?

  • Mainly sensory (input) & motor (output) processes, though may influence central processing also.

MIT2 Lab, UCF


Wbv is bad so what is the issue
WBV is bad, so what is the issue? stressor effects within IMPRINT

  • Everybody knows that vibration is bad for performance….

  • However, the effects of WBV are highly variable, with the effects moderated by a range of other factors:

    - Vibration characteristics (axes, frequency, magnitude, etc)

    - Exposure duration.

    - The type of dependent variable used (i.e., IMPRINT task taxon framework).

MIT2 Lab, UCF


Methods
Methods stressor effects within IMPRINT

  • Systematic search for empirical literature.

    - database searches

    - web-based searches

    - checking reference lists of articles acquired

    - subject matter experts consulted

  • 224 papers identified.

MIT2 Lab, UCF


Inclusion criteria
Inclusion Criteria stressor effects within IMPRINT

  • Empirical examination of the application of WBV.

  • Use of at least one measure of performance.

  • Examination of DIRECT effects on performance.

  • Utilization of a ‘zero-WBV’ control group.

  • Sufficient information/data from which to calculate effect sizes.

    - 13 studies accepted, and coded.

    - the literature more sparse than we expected.

MIT2 Lab, UCF


Results
Results stressor effects within IMPRINT

  • Effect sizes – negative values reflect performance decrements under WBV conditions, when compared to control conditions.

  • Cohen’s d:

    - 0.2 = ‘small effect’

    - 0.5 = ‘medium effect’

    - 0.8 = ‘large effect’

  • Large global effect of WBV on performance (d = -0.95).

MIT2 Lab, UCF


Effect of dependent variable type imprint taxon
Effect of dependent variable type (IMPRINT Taxon) stressor effects within IMPRINT

MIT2 Lab, UCF


Effect of measure type
Effect of measure type stressor effects within IMPRINT

MIT2 Lab, UCF


Effect of intensity
Effect of intensity stressor effects within IMPRINT

MIT2 Lab, UCF


Effect of frequency
Effect of frequency stressor effects within IMPRINT

MIT2 Lab, UCF


Effect of exposure duration
Effect of exposure duration stressor effects within IMPRINT

MIT2 Lab, UCF


Effect of duration by intensity
Effect of duration by intensity stressor effects within IMPRINT

MIT2 Lab, UCF


Conclusions
Conclusions stressor effects within IMPRINT

  • Vibration does indeed act to degrade most goal-directed activities.

  • Most clear effects are on motoric tasks (fine motor continuous especially).

  • Interactions with other stressors?

MIT2 Lab, UCF


Further conclusions implications
Further conclusions & Implications stressor effects within IMPRINT

  • Surprising lack of empirical research that met the criteria for inclusion.

  • The data are what they are….

  • Importance of future methodologically and theoretically rigorous research in order to ‘fill in the gaps’.

  • May need to consider the effect of WBV when designing smaller technologies – importance of testing these with stressors present.

MIT2 Lab, UCF


What now
What now? stressor effects within IMPRINT

  • Ongoing meta-analyses

    – Noise & speech effects on performance

    – Time pressure effects on performance

  • Updates to the Thermal and the Vibration meta-analyses (updated searches, identifying and contacting research groups, etc).

MIT2 Lab, UCF


Acknowledgements
Acknowledgements stressor effects within IMPRINT

The views expressed here are those of the authors and do not necessarily reflect the official policy or position of the Department of the Army, the Department of Defense, or any official agency of the United States government. This work was supported by a sub-contract through Micro-Analysis and Design (MAAD) from the Human Research Engineering Directorate, Army Research Laboratory (HRED-ARL), P.A. Hancock, Principal Investigator (Grant #64018042). We wish to thank John Lockett, Laurel Allender, Celine Richer and Sue Archer, for providing their administrative and technical direction for this Grant. We also thank Dr Bob Kennedy for his insightful discussions on vibration.

MIT2 Lab, UCF


ad