Kathleen Shyhalla, PhD

Experimental Work

Analyst | Engineer | Publications | Experiments  | Gardens  | Wellness | Stats_Jokes 

expsetup Repetitive industrial work with precision requirements
had been associated with the development of upper extremity musculoskeletal disorders.
To learn more, experiments
were conducted in the laboratory.
During experiments
People performed 4 repetitive tasks.

The probe's trajectory
People's joint angles
Electromyographic (EMG) activation patterns
from 6 shoulder muscles


Were monitored continuously.
subject
Main Tasks lasted 7 minutes.
People repetitively moved the probe between the Home (left) and target (right).
Tasks were 4 levels of accuracy.
Accuracy was increased by decreasing target size. 
tap
During composite tasks,
 people repetitively moved the probe
between the Home and a ray of 6 targets for 45 seconds. 
Composite tasks and discomfort surveys
preceded and followed each Main Task.

 
comp

summ
velprobe

Velocity profile of probe during high precision (left) and low precision (right) tasks

psmove

Velocity profile of forearm during tasks

emg

Anterior deltoid EMG during tasks