Investigation of upper limb muscle and brain activities on light assembly tasks: A pilot study

A study was conducted to investigate the effect of light assembly task on upper limb muscles (biceps brachii and upper trapezius) and brain activities. The task was conducted in two levels of time pressure (No time-stress and time-stress levels). Each task was done for one hour experiment. Surface electromyography (SEMG) measured upper limb muscle activities from six subjects. The results indicated that the biceps brachii and upper trapezius activities tend to increase as the increase of time. It indicated muscle fatigue. Electroencephalography (EEG) was simultaneously recorded with SEMG to record brain activities from Fz, Pz, O1 and O2 channels. EEG alphas RMS were higher on the task with time-stress than task without time-stress. The significant correlation was found between SEMG RMS and EEG alpha RMS. Thus, there was relation between upper limb muscle and brain activity while doing the light assembly task.