A psychophysical approach to determine the frequency and duration of work-rest schedules for manual handling operations

Article Abstract:

Two experiments were conducted on two separate groups, consisting of five male college students in one group and four males and one female in the other, to establish whether rest allowances could be determined using psychophysical methods, and the effects of frequency of handling and gender. Results of the study showed that with increased frequency of handling both working and rest time decreased, jobs requiring high frequency needed most rest periods, and that women require more frequent and longer rest allowances.

Physiological aspects, Rest periods, Breaks (Rest periods)

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Guidelines for designing jobs featuring repetitive tasks

Article Abstract:

Employers considering redesigning their workplace in order to reduce workers' exposure to work-related musculoskeletal disorders of the upper limbs (WMSDs) should seek to ensure that workers are able to avoid movements or positions that force the joints to exceed 50% of their maximum range. Work benches must be at a suitable height when standing or sitting, and chair height must be suitable for seated positions. Care must also be taken to eliminate any useless actions carried out by machinery operators.

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Psychophysical study of six hand movements

Article Abstract:

Research is presented quantifying maximum acceptable force levels of six hand motions. These were a handgrip task, power grip with ulnar deviation, pinch grip with wrist extension, pinch grip with wrist flexion, power grip with wrist extension, and power grip with wrist flexion. Depending on motion and frequency, acceptable torque fell between 11% and 19% of maximum isometric levels of torque.

United States, Statistical Data Included, Research, Measurement, Movement (Physiology), Human mechanics, Torque, Grip strength

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