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The neuromuscular responses to conte...

Forth, Katharine E.

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The neuromuscular responses to context-specific foot stimulation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The neuromuscular responses to context-specific foot stimulation./
作者:	Forth, Katharine E.
面頁冊數:	127 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0855.
Contained By:	Dissertation Abstracts International66-02B.
標題:	Health Sciences, Rehabilitation and Therapy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3164990
ISBN:	9780542002908

The neuromuscular responses to context-specific foot stimulation.
Forth, Katharine E.

The neuromuscular responses to context-specific foot stimulation. - 127 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0855.

Thesis (Ph.D.)--University of Houston, 2005.

The overall goal of this project was to elucidate the role of context in the neuromuscular response to foot pressure stimulation. The human body is effectively adapted to match movements to the environment within the context they are presented. Gravitational loading, muscle contraction and body segment orientation are all components of movement context that may alter the neuromuscular response to foot stimulation. This study investigated this issue by varying levels of gravitational loading, body segment orientation and muscle contraction levels while measuring the neuromuscular response to mechanical foot stimulation with surface Electromyography (EMG) of the soleus (SOL) and lateral gastrocnemius (GA). Three experiments were conducted, each involving stimulation to the lateral aspect of the plantar surface of the foot. The first experiment varied levels of gravitational loading while standing, as well as employing a seated condition. The second experiment varied the body segment orientation, relative to support status and postural challenge. The final experiment varied the level of background contractions in a seated position.

ISBN: 9780542002908Subjects--Topical Terms:

1017926
Health Sciences, Rehabilitation and Therapy.

The neuromuscular responses to context-specific foot stimulation.
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502 $a Thesis (Ph.D.)--University of Houston, 2005.
520 $a The overall goal of this project was to elucidate the role of context in the neuromuscular response to foot pressure stimulation. The human body is effectively adapted to match movements to the environment within the context they are presented. Gravitational loading, muscle contraction and body segment orientation are all components of movement context that may alter the neuromuscular response to foot stimulation. This study investigated this issue by varying levels of gravitational loading, body segment orientation and muscle contraction levels while measuring the neuromuscular response to mechanical foot stimulation with surface Electromyography (EMG) of the soleus (SOL) and lateral gastrocnemius (GA). Three experiments were conducted, each involving stimulation to the lateral aspect of the plantar surface of the foot. The first experiment varied levels of gravitational loading while standing, as well as employing a seated condition. The second experiment varied the body segment orientation, relative to support status and postural challenge. The final experiment varied the level of background contractions in a seated position.
520 $a Across all experiments the SOL and GA neuromuscular responses to dynamic lateral foot stimulation were consistent and predictable in temporal features: latency, pattern and duration, while the peak amplitude of the response was highly variable. In both experiment 1 and 2, loading was not a modulating factor to the peak amplitude response. Between sitting and standing, the response was greatly reduced while sitting, including a comparison with a standing condition of similar foot pressure distribution, i.e. loading experienced at the feet. In experiment two, a greater response was measured in the leg with a greater supporting role and in a position of increased postural instability. In experiment 3, the presence of background voluntary contractions of the SOL produced a linear increase in the amplitude of the peak responses. For all conditions in experiment 3, including a passive condition, the SOL peak amplitudes reached with foot stimulation were at least 80% of SOL maximum contraction peak amplitudes. Moreover, the conditions that included 80% SOL contractions generated peak amplitude responses to an equal or greater level as maximum contractions.
520 $a This study demonstrates neuromuscular responses to mechanical foot stimulation are dependent on positional, support, postural stability contexts and background muscle activity. This increased insight can be incorporated into the development and application of countermeasure and rehabilitation devices designed to maintain and/or restore healthy neuromuscular functioning.
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