scholarly journals An electromyographic investigation of asymmetric lifting and moving of a load: II. Effects of load lift from knuckle to target shelves

2009 ◽  
Vol 19 (4) ◽  
pp. 318-328 ◽  
Author(s):  
Biman Das ◽  
Godfrey Mabaleka
Keyword(s):  
Asymmetric Lifting ◽  
Electromyographic Investigation

Three-dimensional asymmetric maximum weight lifting prediction considering dynamic joint strength

2021 ◽  
pp. 095441192098703
Author(s):  
Rahid Zaman ◽  
Yujiang Xiang ◽  
Jazmin Cruz ◽  
James Yang
Keyword(s):  
Experimental Data ◽  
Degrees Of Freedom ◽  
Inverse Dynamics ◽  
Three Dimensional ◽  
Optimization Method ◽  
Weight Lifting ◽  
Joint Torque ◽  
Maximum Weight ◽  
Angular Velocities ◽  
Asymmetric Lifting

In this study, the three-dimensional (3D) asymmetric maximum weight lifting is predicted using an inverse-dynamics-based optimization method considering dynamic joint torque limits. The dynamic joint torque limits are functions of joint angles and angular velocities, and imposed on the hip, knee, ankle, wrist, elbow, shoulder, and lumbar spine joints. The 3D model has 40 degrees of freedom (DOFs) including 34 physical revolute joints and 6 global joints. A multi-objective optimization (MOO) problem is solved by simultaneously maximizing box weight and minimizing the sum of joint torque squares. A total of 12 male subjects were recruited to conduct maximum weight box lifting using squat-lifting strategy. Finally, the predicted lifting motion, ground reaction forces, and maximum lifting weight are validated with the experimental data. The prediction results agree well with the experimental data and the model’s predictive capability is demonstrated. This is the first study that uses MOO to predict maximum lifting weight and 3D asymmetric lifting motion while considering dynamic joint torque limits. The proposed method has the potential to prevent individuals’ risk of injury for lifting.

Effects of Lifting in Four Restricted Work Postures

1987 ◽  
Vol 31 (4) ◽  
pp. 462-466 ◽  
Author(s):  
Sean Gallagher ◽  
Richard L. Unger ◽  
E. William Rossi
Keyword(s):  
Muscle Function ◽  
Coal Mines ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Coal Miners ◽  
Metabolic Costs ◽  
Lifting Capacity ◽  
Asymmetric Lifting

The purpose of this study was to examine the lifting capacity of low-seam coal miners in four restricted work postures (roof heights of 36″, 40″, 44″, and 48″), investigate the associated metabolic costs, and to examine electromyographic (EMG) data from eight trunk muscles during the lifting procedure. Subjects were thirteen underground miners accustomed to handling materials in restricted work postures. Each subject performed two twenty-minute periods of asymmetric lifting in each of four postures during the day of testing. The frequency of lifting was 10 lifts per minute. A specially designed lifting box incorporated microswitches in one handle of the box and another in the bottom of the box, in order to examine the trunk muscle function at specific points during the lfting cycle. The data collected will be used by the Bureau of Mines to make recommendations for lifting materials in low-seam coal mines.

Physiological effects of back belt wearing during asymmetric lifting

2001 ◽  
Vol 32 (6) ◽  
pp. 541-547 ◽  
Author(s):  
Thomas G. Bobick ◽  
Jean-Louis Belard ◽  
Hongwei Hsiao ◽  
James T. Wassell
Keyword(s):  
Physiological Effects ◽  
Asymmetric Lifting

Some Aspects of Lumbrical Function

1988 ◽  
Vol 13 (1) ◽  
pp. 54-59
Author(s):  
N. CITRON ◽  
A. FOSTER
Keyword(s):  
Flexor Digitorum Profundus ◽  
Flexor Digitorum ◽  
Electromyographic Investigation

An electromyographic investigation was performed on the hands of six volunteers. The functioning of the lumbrical and flexor digitorum profundus muscles during resisted and unresisted extension was studied. No subject showed much simultaneous contraction of the two muscles in unresisted extension of the interphalangeal joints, but some showed marked simultaneous contraction during resisted extension. We suggest that, in these individuals, the profundus is acting to steady the origin of the lumbrical so that it can act more efficiently.

Spine loading during asymmetric lifting using one versus two hands

Ergonomics ◽  
1998 ◽  
Vol 41 (6) ◽  
pp. 817-834 ◽  
Author(s):  
WILLIAM S. MARRAS ◽  
KERMIT G. DAVIS
Keyword(s):  
Asymmetric Lifting
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