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Biomechanical and physiological chan...

Sesto, Mary Elizabeth.

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Biomechanical and physiological changes following submaximal eccentric activity.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Biomechanical and physiological changes following submaximal eccentric activity./
作者:	Sesto, Mary Elizabeth.
面頁冊數:	171 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2341.
Contained By:	Dissertation Abstracts International64-05B.
標題:	Engineering, Industrial. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3089723

Biomechanical and physiological changes following submaximal eccentric activity.
Sesto, Mary Elizabeth.

Biomechanical and physiological changes following submaximal eccentric activity. - 171 p.

Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2341.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2003.

This research investigated in-vivo changes in mechanical and physiologic properties of the forearm following exposure to repetitive submaximal eccentric exertions. Eccentric activity has been associated with muscle soreness and injury. Our laboratory has developed a mechanical model that represents the power hand tool operator as a single degree of freedom mechanical system that is characterized by mass, spring and damping elements. It was hypothesized that the mechanical stiffness and inertial mass parameters are affected by repetitive submaximal eccentric exertions typical to power hand tool operation.Subjects--Topical Terms:

626639
Engineering, Industrial.

Biomechanical and physiological changes following submaximal eccentric activity.
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245 1 0 $a Biomechanical and physiological changes following submaximal eccentric activity.
300 $a 171 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2341.
500 $a Supervisor: Robert G. Radwin.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2003.
520 $a This research investigated in-vivo changes in mechanical and physiologic properties of the forearm following exposure to repetitive submaximal eccentric exertions. Eccentric activity has been associated with muscle soreness and injury. Our laboratory has developed a mechanical model that represents the power hand tool operator as a single degree of freedom mechanical system that is characterized by mass, spring and damping elements. It was hypothesized that the mechanical stiffness and inertial mass parameters are affected by repetitive submaximal eccentric exertions typical to power hand tool operation.
520 $a Four experiments were completed. In the first two experiments, 26 subjects were exercised at 50% MVC for 10 minutes or 30 minutes respectively, at a frequency of 10 contractions per minute. Decreases in both mechanical properties were associated with submaximal eccentric contractions, but not with isometric contractions. The average percent change in mechanical stiffness from pre-exercise to post-exercise for the isometric and control exercise groups was less than 5% as compared to the eccentric exercise group, which experienced a 53% decrease in stiffness. An average 25% increase in the MRI T2 relaxation time, which is associated with edema, was present 72 hr following submaximal repetitive eccentric activity. In the third experiment, mechanical properties of 14 industrial workers were investigated. Workers were categorized as asymptomatic (n = 7) versus symptomatic (n = 7) based on forearm symptoms and physical exam findings. Symptomatic workers demonstrated an average 46% decreased mechanical stiffness and 59% less mass moment of inertia than the asymptomatic workers. In the fourth experiment, the effects of power tool peak torque and build up time on mechanical properties of the upper extremity were assessed for 29 male subjects. A decrease in both mechanical properties was observed for subjects that operated tools with a long build up time (250ms) as compared to a short build up time (50ms) regardless of peak torque level (9 Nm or 3 Nm). Subjects that operated high peak torque tools with a long build up time demonstrated the greatest decrease (50%) in mechanical stiffness.
590 $a School code: 0262.
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