Human-Computer Interaction: Ergonomics and User Interfaces - Vol. 1

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview

One explanation for the higher relative EMG level for the elderly may be more co-activation of antagonist muscles, which has been found in another laboratory study (Spiegel et al 1996). The muscles responded significantly different to the different mouse tasks, although the differences were minor. The task causing the highest muscle activity was double clicking for the wrist flexors and extensors, and the self-selected speed clicking tasks for the finger extensors. Increased precision demands cause an increased muscle activity when the working speed was fixed in agreement with what has been found previously ( Laursen et al.; 1998). When the speed was self-selected, the precision demand had no effect on muscle activity.

In conclusion, the elderly performed the mouse work slower than the young group but with the same error rate, when the working speed was self-selected. Double clicking caused many errors for the elderly group. The relative muscle load was higher for the elderly group. There were small but significant differences in muscle load between the different mouse tasks.


5
References

Ilmarinen J., Vouhevaara V., Korhonen O., Nygård C. H., Hakola T.,& Suvanto S. ( 1991). Changes in maximal cardiorespiratory capacity among aging municipal employees. Scand J Work Environ Health, 17 (suppll), 99-109

ISO 9241 ( 1994). Visual display terminals (VDTs) used for office tasks Ergonomic requirements. Part 9: Non-keyboard input device requirements (committee draft)

Kinoshita H. & Francis P.R. ( 1996). "A comparison of prehension force control in young and elderly individuals". Eur J Appl Physiol, 74, 450-460

Laursen B., Jensen B. R., & Sjϕgaard G. ( 1998). "Effect of speed and precision demands on human shoulder muscle electromyography during a repetitive task". Eur J Appl Physiol, 78, 544-548

Spiegel K. M., Stratton J., Burke J. R., Glendinning D. S., & Enoka R. M. ( 1996). "The influence of age on the assessment of motor unit activation in a human hand muscle". Exp Physiol, 81, 805-819

-92-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items

Items saved from this book

This book has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this book

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited page

Bookmark this page
Human-Computer Interaction: Ergonomics and User Interfaces - Vol. 1
Table of contents

Table of contents

Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen
/ 1356

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Buy instant access to cite pages or passages in MLA, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    Buy instant access to save your work.

    Already a member? Log in now.

    Oops!

    An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.