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Effects of frequency and amplitude m...

Poojari, Dhiraj.

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Effects of frequency and amplitude modulations of phasic discharge behavior of motor units in a sinusoidal sub-maximal force matching task.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Effects of frequency and amplitude modulations of phasic discharge behavior of motor units in a sinusoidal sub-maximal force matching task./
作者:	Poojari, Dhiraj.
面頁冊數:	60 p.
附註:	Adviser: Christopher A. Knight.
Contained By:	Masters Abstracts International45-06.
標題:	Biology, Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1444621
ISBN:	9780549059202

Effects of frequency and amplitude modulations of phasic discharge behavior of motor units in a sinusoidal sub-maximal force matching task.
Poojari, Dhiraj.

Effects of frequency and amplitude modulations of phasic discharge behavior of motor units in a sinusoidal sub-maximal force matching task. - 60 p.

Adviser: Christopher A. Knight.

Thesis (M.S.M.S.)--University of Delaware, 2007.

The aim of this thesis was to gain new knowledge on the contributions of higher threshold motor units (MU) to oscillatory force modulations. We focused on MUs producing brief sets of action potentials during the peaks in sinusoidal isometric force tasks with oscillations around 20% of maximal voluntary force (MVC). Motor unit action potentials were recorded from the first dorsal interosseous muscle of 20 young adults as they performed six tasks with different amplitude (+/- 3, 6 %MVC) and frequency combinations (.3, .6, .9 Hz). Among dependent measures that describe the recruitment and discharge behaviors, two variables are advanced to explain how the nervous system controls progressively faster force oscillations. As task frequency and amplitude increased, a greater rate of change in force is necessary in both contraction and relaxation. The duration of the first inter-spike interval was strongly affected by task frequency with a linear 45.73% decrease from the .3 to the .9 Hz condition (F=7.898, p<0.01). Measures of de/recruitment force levels and the temporal relationship between MU discharge and peaks in force showed that the nervous system delivers, or terminates the delivery of action potentials to muscle with increasing phase advance as the rate of change in force increases. These results give new insight to higher threshold motor units that have major contributions to the production of force, due to their greater contractile force.

ISBN: 9780549059202Subjects--Topical Terms:

1017816
Biology, Physiology.

Effects of frequency and amplitude modulations of phasic discharge behavior of motor units in a sinusoidal sub-maximal force matching task.
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502 $a Thesis (M.S.M.S.)--University of Delaware, 2007.
520 $a The aim of this thesis was to gain new knowledge on the contributions of higher threshold motor units (MU) to oscillatory force modulations. We focused on MUs producing brief sets of action potentials during the peaks in sinusoidal isometric force tasks with oscillations around 20% of maximal voluntary force (MVC). Motor unit action potentials were recorded from the first dorsal interosseous muscle of 20 young adults as they performed six tasks with different amplitude (+/- 3, 6 %MVC) and frequency combinations (.3, .6, .9 Hz). Among dependent measures that describe the recruitment and discharge behaviors, two variables are advanced to explain how the nervous system controls progressively faster force oscillations. As task frequency and amplitude increased, a greater rate of change in force is necessary in both contraction and relaxation. The duration of the first inter-spike interval was strongly affected by task frequency with a linear 45.73% decrease from the .3 to the .9 Hz condition (F=7.898, p<0.01). Measures of de/recruitment force levels and the temporal relationship between MU discharge and peaks in force showed that the nervous system delivers, or terminates the delivery of action potentials to muscle with increasing phase advance as the rate of change in force increases. These results give new insight to higher threshold motor units that have major contributions to the production of force, due to their greater contractile force.
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