Self-Selected Manual Lifting Technique - Functional Consequences of the Interjoint Coordination

Burgesslimerick, R, Abernethy, B, Neal, RJ and Kippers, V (1995) Self-Selected Manual Lifting Technique - Functional Consequences of the Interjoint Coordination. Human Factors, 37 2: 395-411. doi:10.1518/001872095779064537

Author Burgesslimerick, R
Abernethy, B
Neal, RJ
Kippers, V
Title Self-Selected Manual Lifting Technique - Functional Consequences of the Interjoint Coordination
Journal name Human Factors   Check publisher's open access policy
ISSN 0018-7208
Publication date 1995-06-01
Year available 1995
Sub-type Article (original research)
DOI 10.1518/001872095779064537
Open Access Status Not yet assessed
Volume 37
Issue 2
Start page 395
End page 411
Total pages 17
Place of publication SANTA MONICA
Language eng
Abstract The pattern of movement self-selected by 39 subjects to lift light loads from 9 cm above the ground is described in kinematic and electromyographic terms. Hamstring length changes were estimated from hip and knee angular kinematics. Subjects adopted a posture at the start of the lift intermediate between stoop and full-squat postures. A consistent coordination between knee, hip, and lumbar vertebral joints during lifting was described through calculation of the relative phase between adjacent joints and found to be exaggerated with increases in load mass. During the early phase of lifting, knee extension leads hip extension, which in turn leads extension of the lumbar vertebral joints. Early in the lifting movement, when load acceleration is greatest, the erectores spinae are thus relatively long and shortening slowly. Both of these factors produce greater back extensor strength. Rapid hamstring shortening is also delayed, which enhances their strength, and coactivation of the monoarticular knee extensors and biarticular hamstrings observed early in the lifting movement suggested that the knee extensors contribute to hip extension through a tendinous action of the hamstrings.
Keyword Muscular-Activity
Trunk Flexion
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: ResearcherID Downloads - Archived
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