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Physiological changes during computer tasks: responses to mental load or to motor demands

Article Abstract:

The physiological effects of motor activity during typical computer tasks are negligible. Such motor activity affects physiological measures only at a very high typing speed. The physiological effects of computer work are dependent exclusively on mental load at lower levels of motor activity. Skin conductance responses are the most sensitive indicators of the effects of mental load during computer tasks, which appears to be independant of physical demands.

Health aspects, Human-computer interaction, Computer operators

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Voluntary redistribution of muscle activity in human shoulder muscles

Article Abstract:

Electromyography studies of four shoulder blades in abducted arm positions of eight healthy female volunteers revealed that subjects possess varying levels of ability to regulate muscle activities in the form of mitigation of EMG activity in the trapezius muscle. However, the presence of a major voluntary effect in the trapezius muscle is attributed for the unreliable nature of measurements of trapezius EMG in estimating total shoulder load.

Shoulder, Shoulder muscles, Trapezius muscle

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