Project: Research project

Project Details


Manual materials handling activities can cause high stresses on the
musculoskeletal system. The dynamic nature of these tasks, such as
lifting, preclude the use of the traditional concepts of human strength:
isometric and isotonic contractions. Instead the novel development
isokinetic muscle contraction has expanded the study of dynamic muscle
strength. Isokinetic contractions occur against a lever arm which controls
the velocity of movement and offers resistance proportional to the muscle
dynamic tension developing capacity at every point in the range of motion.
Thus the maximum demand can be placed on the muscle at any time, and, by
selecting appropriate velocities, muscle power can be maximized. The
proposal is to quantify the dynamic strength of those muscle groups that
relate to MMH activities in a four-phase research plan. (1) Investigate in
detail the dynamic properties of muscle strength for those muscle groups
used most often in manual material handling activities. (2) Compare the
measurement of these properties on th stationary Cybex isokinetic
dynamometer with those measured on the portable Mini-Gym isokinetic
dynamometer through correlation analysis. (3) Devise dynamic strength
tests that would be representative of the actions and muscle grops for
manual materials handling activities and that could be easily implemented
for pre-employment strength testing. (4) Compare the dynamic strength
tests with existing static and psychophysical tests and with predictions
from dynamic models.
Effective start/end date12/31/8912/31/89


  • National Institutes of Health


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