Recruitment of low threshold motor-units in the trapezius muscle in different static arm positions

Article Abstract:

A study was conducted to verify the presence of motor-units with low threshold in the upper trapezius muscle. Literature suggests that trapezius myalgia have electrophysiological correlates. A method of recording motor-unit potentials from the muscle was developed using fine-wire electrodes. The method allowed the identification of a single motor-unit. Very high-quality electromyographic signals that can be successfully decomposed were obtained using the same method. It was found that the fine-wire electrode used was still in its original position even after upper arm exercises.

Myalgia, Electrophysiology

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Visual accommodation and subject performance during a stereographic object task using liquid crystal shutters

Article Abstract:

Some people manifest large changes in accommodation while doing a stereographic task. When the virtual target is farther and nearer than the baseline, there is a tendency to accommodate to a distance nearer than the baseline. Visual fatigue or loss of accommodation and diminished task performance can result from prolonged stereoscopic viewing. These are some of the conclusions from a study of visual accommodation and task performance during stereographic vision, conducted to improve understanding of human response to virtual reality.

Three-dimensional display systems, Three dimensional displays, Virtual reality

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Overhead work and shoulder-neck pain in orchard farmers harvesting pears and apples

Article Abstract:

A study of 52 Japanese women farmers involved in apple bagging or pear bagging revealed that apple pickers were more susceptible to musculoskeletal complaints such as pain and stiffness of the neck and shoulder. This finding reveals direct correlations between overhead work requiring arm elevation, head extension and the occurrence of shoulder-neck disorders in farmers.

Health aspects, Japan, Women, Women farmers

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