الفهرس 
Isokinetic measurements of shoulder muscles performance in notebook computer users
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Abstract
Background: The use of notebook computers has quickly become very popular among computer users due to their light weight, small size, portability, and battery power option. Purposes: To investigate the isokinetic measurements of shoulder muscle performance in notebook computer users. Subjects: Thirty healthy subjects from both sexes were assigned into two equal groups group (A)was consisted of fifteen subjects of notebook computer users. Their mean age (22.33±1.11) years, weight (75.36±17.6) kg, height (170.13±8.5) cm. group (B)was consisted of fifteen subjects of non-notebook computer users. Their mean age (22.8±3.4) years, weight (68.26±16.9) kg, height (171.53±10.35) cm. Materials and Methods: All participants were tested for shoulder flexion from 90{u00B0} to 180{u00B0} and they were tested for shoulder abduction from 15{u00B0} to 135{u00B0} at angular velocity 60{u00B0}/ sec and 180{u00B0}/ sec for both ranges to measure muscle work, torque and work fatigue of shoulder flexors and abductors using Biodex system-3 isokinetic dynamometer. Results: There were no significant differences between the two groups in shoulder flexors work, torque and work fatigue at angular velocity 60{u00B0}/ sec, and at angular velocity 180{u00B0}/ sec. There were no significant differences between two groups in shoulder abductors work, torque and work fatigue at angular velocity 60{u00B0}/ sec, and at angular velocity 180{u00B0}/ sec