Mental Fatigue and Industrial Work Performance: The Influence of the Laevo Exoskeleton

Work performance: Percent accuracy Serial Seven Task

时间窗: 30 minutes

An audio record of this task will be made to verify made errors posthoc. During the serial seven task participants are given a number between 900 and 950. The given starting number will change each trial. Participants are asked to subsequently subtract seven as fast as possible.The researcher will take note of every answer. If the participant makes an error, he/she may continue to calculate with the wrong number. The ratio of correct answers to the total number of responses will indicate the percent accuracy for each participant.

Ergonomics: EMG-data

时间窗: 30 minutes

Muscle activity during the performance of the industrial task of the erector spinae muscle, m. rectus abdominus, both m. obliqui abdominus, all three parts of m. trapezius, all three of m. deltoideus, m. pectoralis major, m. latissimus dorsi, m. biceps brachii, m. triceps brachii,m. flexor- and extensor carpi radials, m. flexor- and extensor carpi ulnaris, m. flexor- and extensor digitorum, m. gluteus maximus and medius, m. rectus femoris, m. biceps femoris. ; measured with Cometa mini wave.

VICON: Placement accuracy Box

时间窗: 30 minutes

Accuracy of placement box during the dual-task will be measured with VICON. VICON-markers will be placed on the box to track its movement during the trial. First, the optimal position of the box for each level (ground or shoulder) will be determined, these will form the reference frames. Next, the accuracy of each relocation will be determined by the offset compared to these reference frames. This will be calculated into a percentage.

Ergonomics: Joint angles

时间窗: 30 minutes

Joint angles will be measured during the performance of the industrial task to evaluate movement variability. 30 VICON markers will be placed bilateral on the body of the participant on anatomical landmarks.

Mental fatigue: EEG-data

时间窗: 60 minutes

Alpha, Beta and Theta activity in the electroencephalogram measured with open bci (OpenBci, inc)

Mental fatigue: VAS-score

时间窗: 60 minutes

Participants are asked to indicate their subjective feeling on a straight line ranging from "not at all mentally fatigued" to "extreme mentally fatigued"