Using leg muscles as shock absorbers: theoretical predictions and experimental results of drop landing performance
Article Abstract:
The use of muscles not as mere power producers but as power dissipators is analyzed by using a model that accounted for the mechanical characteristics of knee extensor muscles, geometry of the limb and the estimated stiffness of the 'global elastic elements' acting below the squat position. Maximum neural activation was likewise assumed. Safe landing was predicted to occur when the fall was from a height of 1.6 m to two meters. As predicted, experimental landings from heights of 0.4, 0.7 and 1.1 m were proven safe for sedentary males, as well as for male and female athletes.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1998
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Grip posture and forces during holding cylindrical objects with circular grips
Article Abstract:
The position of individual fingers, while holding cylindrical objects, remains constant for all weights, and fingers have the maximum grip capacity when oriented toward the thumb. Findings suggest that holding objects from above using a circular grip require less effort. While the ring and little fingers have greater grip forces, the grip force increases when lesser number of fingers are used. Data about individual finger position and external grip forces helps in the designing of hand-held tools and high-tech hand prosthetic devices.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1996
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Electromyography of spinal and abdominal muscles during garden raking with two rakes and rake handles
Article Abstract:
An investigation of the physical stresses involved in raking shows, on the basis of the electromyography, that pushing is physically more strenuous in comparison to pulling. Previous biochemical investigation of simulated exercise showed that rake pulling produced little physical stresses never attaining the action limit. A modified rake handle was also tested, and resulted in a reduction in physical stress.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1995
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