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Leg spring model related to muscle a...

Dutto, Darren John.

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Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustion.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustion./
作者:	Dutto, Darren John.
面頁冊數:	181 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-12, Section: A, page: 4363.
Contained By:	Dissertation Abstracts International60-12A.
標題:	Education, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9954855
ISBN:	0599576790

Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustion.
Dutto, Darren John.

Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustion. - 181 p.

Source: Dissertation Abstracts International, Volume: 60-12, Section: A, page: 4363.

Thesis (Ph.D.)--Oregon State University, 1999.

Altered stride rate has been consistently observed during running to fatigue. One mechanism for shifting stride rate is a change in leg stiffness, as described by the spring-mass model. The purpose of this study was to determine whether or not vertical stiffness, kvert, changed with exhaustion, and whether kinematics or muscle activity related to any observed changes. Fifteen trained runners performed a run to volitional exhaustion at a constant speed roughly corresponding to 80% of their VO2 peak. Vertical ground reaction forces were recorded every five minutes using an instrumented treadmill. From the force data, temporal characteristics, kvert, and kleg, were calculated for about 40 stances. Muscle activity was determined for five, right limb muscles: vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF), gastrocnemius (G), and tibialis anterior (TA). From the EMG recordings, IEMG and muscle activation times were determined for about 10 stance periods. Ankle, knee, and thigh angles were determined for about 10 stance periods from the same sample period as the EMG, and angular range of motion was calculated. Results from individual single factor ANOVA analyses indicate either increased or decreased kvert for fourteen of the fifteen subjects over the test run (p < 0.01). Changes in vertical stiffness agree well with changes in stride rate (r = 0.85), confirming continued spring-like behavior of the leg with exhaustion. From hierarchical regression analyses, ankle, knee, and thigh range of motion were found to relate to kvert for many subjects with between 10 and 99% of the variability in kvert explained by all three variables. Muscle activity of the VM, VL, and G muscles was found to explain between 3 and 98% of the variability in vertical stiffness across all 15 subjects. Interesting individual observations can be made from the kinematic and EMG data, but no patterns across subject emerge relating to changes in kvert.

ISBN: 0599576790Subjects--Topical Terms:

1018000
Education, Physical.

Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustion.
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520 $a Altered stride rate has been consistently observed during running to fatigue. One mechanism for shifting stride rate is a change in leg stiffness, as described by the spring-mass model. The purpose of this study was to determine whether or not vertical stiffness, kvert, changed with exhaustion, and whether kinematics or muscle activity related to any observed changes. Fifteen trained runners performed a run to volitional exhaustion at a constant speed roughly corresponding to 80% of their VO2 peak. Vertical ground reaction forces were recorded every five minutes using an instrumented treadmill. From the force data, temporal characteristics, kvert, and kleg, were calculated for about 40 stances. Muscle activity was determined for five, right limb muscles: vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF), gastrocnemius (G), and tibialis anterior (TA). From the EMG recordings, IEMG and muscle activation times were determined for about 10 stance periods. Ankle, knee, and thigh angles were determined for about 10 stance periods from the same sample period as the EMG, and angular range of motion was calculated. Results from individual single factor ANOVA analyses indicate either increased or decreased kvert for fourteen of the fifteen subjects over the test run (p < 0.01). Changes in vertical stiffness agree well with changes in stride rate (r = 0.85), confirming continued spring-like behavior of the leg with exhaustion. From hierarchical regression analyses, ankle, knee, and thigh range of motion were found to relate to kvert for many subjects with between 10 and 99% of the variability in kvert explained by all three variables. Muscle activity of the VM, VL, and G muscles was found to explain between 3 and 98% of the variability in vertical stiffness across all 15 subjects. Interesting individual observations can be made from the kinematic and EMG data, but no patterns across subject emerge relating to changes in kvert.
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