東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Leg stiffness and muscle activity du...

Ferris, Daniel Perry.

Linked to FindBook

Google Book

Amazon

博客來

Leg stiffness and muscle activity during human locomotion.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Leg stiffness and muscle activity during human locomotion./
Author:	Ferris, Daniel Perry.
Description:	103 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-03, Section: B, page: 0906.
Contained By:	Dissertation Abstracts International60-03B.
Subject:	Biology, Animal Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9922823
ISBN:	0599223944

Leg stiffness and muscle activity during human locomotion.
Ferris, Daniel Perry.

Leg stiffness and muscle activity during human locomotion. - 103 p.

Source: Dissertation Abstracts International, Volume: 60-03, Section: B, page: 0906.

Thesis (Ph.D.)--University of California, Berkeley, 1998.

When humans and other animals run, they literally bounce along the ground. The combined action of the integrated musculoskeletal system results in the over-all leg behaving like a single mechanical spring during stance. This dissertation examines how humans adjust their leg stiffness and muscle activity in response to changes in environmental forces. The first three chapters focus on leg stiffness adjustments to accommodate surfaces of different stiffnesses. I find that humans increase leg stiffness for lower surface stiffnesses when they hop or run. This adjustment allows humans to perfectly offset decreases in surface stiffness. As a result, humans run with similar biomechanics (e.g., stride frequency, ground contact time, total vertical displacement of the center of mass, and peak ground reaction force) regardless of surface stiffness. When runners encounter abrupt changes in the running surface, they immediately adjust leg stiffness for their first step on the new surface. These results provide important insight into the mechanics and control of animal locomotion, and suggest that incorporating an adjustable leg stiffness may increase the capabilities of robots and prostheses on varied terrain. The last chapter of this thesis investigates how humans adjust muscle activity to accommodate simulated reduced gravity. The results show that reduced gravity has fundamentally different effects on muscle recruitment patterns during walking and running. In addition, the finding that vastus lateralis activity during walking is independent of gravity level helps explain why the metabolic cost of walking decreases only slightly under reduced gravity.

ISBN: 0599223944Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

Leg stiffness and muscle activity during human locomotion.
LDR:02548nmm 2200277 4500 001 1843020
005 20051010101550.5
008 130614s1998 eng d
020 $a 0599223944
035 $a (UnM)AAI9922823
035 $a AAI9922823
040 $a UnM $c UnM
100 1 $a Ferris, Daniel Perry. $3 1931263
245 1 0 $a Leg stiffness and muscle activity during human locomotion.
300 $a 103 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-03, Section: B, page: 0906.
500 $a Chair: Claire T. Farley.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 1998.
520 $a When humans and other animals run, they literally bounce along the ground. The combined action of the integrated musculoskeletal system results in the over-all leg behaving like a single mechanical spring during stance. This dissertation examines how humans adjust their leg stiffness and muscle activity in response to changes in environmental forces. The first three chapters focus on leg stiffness adjustments to accommodate surfaces of different stiffnesses. I find that humans increase leg stiffness for lower surface stiffnesses when they hop or run. This adjustment allows humans to perfectly offset decreases in surface stiffness. As a result, humans run with similar biomechanics (e.g., stride frequency, ground contact time, total vertical displacement of the center of mass, and peak ground reaction force) regardless of surface stiffness. When runners encounter abrupt changes in the running surface, they immediately adjust leg stiffness for their first step on the new surface. These results provide important insight into the mechanics and control of animal locomotion, and suggest that incorporating an adjustable leg stiffness may increase the capabilities of robots and prostheses on varied terrain. The last chapter of this thesis investigates how humans adjust muscle activity to accommodate simulated reduced gravity. The results show that reduced gravity has fundamentally different effects on muscle recruitment patterns during walking and running. In addition, the finding that vastus lateralis activity during walking is independent of gravity level helps explain why the metabolic cost of walking decreases only slightly under reduced gravity.
590 $a School code: 0028.
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Biology, Neuroscience. $3 1017680
690 $a 0433
690 $a 0317
710 2 0 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 60-03B.
790 1 0 $a Farley, Claire T., $e advisor
790 $a 0028
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9922823