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The effects of a psychological stres...

Muse, Jeri Lyn.

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The effects of a psychological stressor on EMG activity while performing a typing task in good and poor ergonomic positions.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The effects of a psychological stressor on EMG activity while performing a typing task in good and poor ergonomic positions./
作者:	Muse, Jeri Lyn.
面頁冊數:	89 p.
附註:	Adviser: Richard N. Gevirtz.
Contained By:	Dissertation Abstracts International60-05B.
標題:	Health Sciences, Occupational Health and Safety. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9930634
ISBN:	0599308419

The effects of a psychological stressor on EMG activity while performing a typing task in good and poor ergonomic positions.
Muse, Jeri Lyn.

The effects of a psychological stressor on EMG activity while performing a typing task in good and poor ergonomic positions. - 89 p.

Adviser: Richard N. Gevirtz.

Thesis (Ph.D.)--California School of Professional Psychology - San Diego, 1999.

Acute, chronic, and recurrent occupational muscle pain, and more specifically repetitive strain injury (RSI) cause a substantial burden to industry, healthcare, and society in financial costs, disability, and lost work days. While much research has been conducted to improve our understanding of the underlying mechanisms, the results have been inconsistent. The factors that have been associated with RSI in descriptive data have not been shown to affect the development of RSI when each factor has been looked at singularly. Those factors include, muscle load, muscle fatigue, pattern of muscle usage, i.e., angle of joint use, static posturing, and work/rest cycles and psychological factors. Stress has been hypothesized to play a role in the development of RSI as a result of increased muscle tension. The role of the sympathetic nervous system in the development of muscle tension via muscle spindles has been suggested. Others have suggested that trigger points are muscle spindles, and that sympathetically induced contractions of the muscle spindle's intrafusal fibers are what is measured by trigger point nEMG activity. In addition, it has been demonstrated in several studies that laboratory induced stress consistently increases trigger point nEMG activity.

ISBN: 0599308419Subjects--Topical Terms:

1017799
Health Sciences, Occupational Health and Safety.

The effects of a psychological stressor on EMG activity while performing a typing task in good and poor ergonomic positions.
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245 1 0 $a The effects of a psychological stressor on EMG activity while performing a typing task in good and poor ergonomic positions.
300 $a 89 p.
500 $a Adviser: Richard N. Gevirtz.
500 $a Source: Dissertation Abstracts International, Volume: 60-05, Section: B, page: 2356.
502 $a Thesis (Ph.D.)--California School of Professional Psychology - San Diego, 1999.
520 $a Acute, chronic, and recurrent occupational muscle pain, and more specifically repetitive strain injury (RSI) cause a substantial burden to industry, healthcare, and society in financial costs, disability, and lost work days. While much research has been conducted to improve our understanding of the underlying mechanisms, the results have been inconsistent. The factors that have been associated with RSI in descriptive data have not been shown to affect the development of RSI when each factor has been looked at singularly. Those factors include, muscle load, muscle fatigue, pattern of muscle usage, i.e., angle of joint use, static posturing, and work/rest cycles and psychological factors. Stress has been hypothesized to play a role in the development of RSI as a result of increased muscle tension. The role of the sympathetic nervous system in the development of muscle tension via muscle spindles has been suggested. Others have suggested that trigger points are muscle spindles, and that sympathetically induced contractions of the muscle spindle's intrafusal fibers are what is measured by trigger point nEMG activity. In addition, it has been demonstrated in several studies that laboratory induced stress consistently increases trigger point nEMG activity.
520 $a This study was conducted to explore the relationships between trigger point and adjacent muscle nEMG, and surface EMG activity while performing a typing task under stressful and non-stressful conditions in good and poor ergonomic positions. Sixteen participants with upper extremity pain symptoms related to a repetitive task and lasting more than 10 months were included in the data analysis. An analysis of variance for repeated measures demonstrated a significant increase in trigger point nEMG activity across the stress condition as compared to the non-stress condition. The adjacent muscle nEMG activity was not significantly higher in the stress conditions. The impact of ergonomics was not significant on either the trigger point or the adjacent muscle nEMG activity. Surface EMG activity did not change significantly across the stress or the poor ergonomic conditions.
520 $a The results of this study suggest that increased sympathetic activity increases muscle spindle activity in the upper trapezius, during a repetitive task. In addition, this study suggests a change in ergonomics does not significantly effect trigger point or adjacent muscle nEMG activity. The relationship between increased trigger point activity and the development of symptoms remains unknown.
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