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The effects of lower extremity muscl...

Cerullo, James Francis.

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The effects of lower extremity muscle fatigue on vertical ground reaction forces and muscle activation patterns during landing.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The effects of lower extremity muscle fatigue on vertical ground reaction forces and muscle activation patterns during landing./
作者:	Cerullo, James Francis.
面頁冊數:	125 p.
附註:	Adviser: Scott M. Lephart.
Contained By:	Dissertation Abstracts International61-08B.
標題:	Health Sciences, Recreation. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9985011
ISBN:	0599919256

The effects of lower extremity muscle fatigue on vertical ground reaction forces and muscle activation patterns during landing.
Cerullo, James Francis.

The effects of lower extremity muscle fatigue on vertical ground reaction forces and muscle activation patterns during landing. - 125 p.

Adviser: Scott M. Lephart.

Thesis (Ph.D.)--University of Pittsburgh, 2000.

The purpose of this study was to determine the effects of dynamic lower extremity muscle fatigue on vertical ground reaction force (vGRF) data and muscle activation patterns during consciously controlled drop landings. Twenty recreationally active college students (10 male, 10 female, mean age = 21.5 ± 1.7 y) volunteered for this study. Subjects participated in two testing sessions (control & fatigue) separated by 72 hrs in a counterbalanced order. Subjects were asked to land with maximum knee flexion and minimum knee flexion when executing a soft and stiff landing, respectively. Within each session, subjects were asked to perform six landings (total = 24 landings per subject) from a height of 60 cm. A functional fatigue protocol was conducted on a treadmill at sub-maximal intensity using a Rating of Perceived Exertion (RPE) as an anchoring system to establish exercise intensity. A force platform was used to collect vGRF at a sampling frequency of 1000 Hz. A set of two kinetic and three temporal variables describing the vGRF profiles was compiled for each trial using laboratory software.

ISBN: 0599919256Subjects--Topical Terms:

1018003
Health Sciences, Recreation.

The effects of lower extremity muscle fatigue on vertical ground reaction forces and muscle activation patterns during landing.
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245 1 0 $a The effects of lower extremity muscle fatigue on vertical ground reaction forces and muscle activation patterns during landing.
300 $a 125 p.
500 $a Adviser: Scott M. Lephart.
500 $a Source: Dissertation Abstracts International, Volume: 61-08, Section: B, page: 4112.
502 $a Thesis (Ph.D.)--University of Pittsburgh, 2000.
520 $a The purpose of this study was to determine the effects of dynamic lower extremity muscle fatigue on vertical ground reaction force (vGRF) data and muscle activation patterns during consciously controlled drop landings. Twenty recreationally active college students (10 male, 10 female, mean age = 21.5 ± 1.7 y) volunteered for this study. Subjects participated in two testing sessions (control & fatigue) separated by 72 hrs in a counterbalanced order. Subjects were asked to land with maximum knee flexion and minimum knee flexion when executing a soft and stiff landing, respectively. Within each session, subjects were asked to perform six landings (total = 24 landings per subject) from a height of 60 cm. A functional fatigue protocol was conducted on a treadmill at sub-maximal intensity using a Rating of Perceived Exertion (RPE) as an anchoring system to establish exercise intensity. A force platform was used to collect vGRF at a sampling frequency of 1000 Hz. A set of two kinetic and three temporal variables describing the vGRF profiles was compiled for each trial using laboratory software.
520 $a Preparatory and reactive electromyography (EMG) from the anterior tibialis (AT), peroneus longus, (PL), medial gastrocnemius (MG), and soleus (S) were sampled at 150 ms and 250 ms prior to and at touchdown, respectively. Separate two factor repeated measures ANOVA were performed on each of the kinetic and temporal variables. Separate three factor repeated measures ANOVA were performed on each of the landing styles for both the preparatory and reactive phases of the EMG data. Results of the statistical analysis revealed a significant (p < .05) session by gender interaction on the temporal variable of impulse, with post hoc analysis demonstrating a significant difference between sessions (fatigue < control) for only the males. Significant main effects (p < .05) for session were revealed on the variables of rearfoot impact (F2) soft-landings and forefoot impact (F1) stiff-landings (fatigue > control & control > fatigue, respectively). Statistical analysis revealed a significant (p < .05) gender x condition x phase interaction. Post hoc analysis revealed that the males had significantly more reactive activity from the MG during stiff landings (fatigue > control).
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