Date of Award


Publication Type

Master Thesis

Degree Name




First Advisor

Cort, Joel


Direct Current, Electromyography, Ergonomics, Right Angle Power Tools, Turbo Tight, Two Stage



Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.


The purpose of this study was to evaluate the differences in muscle activation and handle forces between three direct current right angle power tool fastening strategies: turbo tight, two stage without soft stop and two stage with soft stop. Thirty-six participants (20-60 yrs) were assigned to one of two experimental groups: hard-joints or soft-joints. Participants conducted fastenings at four different postures for three different target torques and muscle sEMG was collected on 16 muscles of the upper body. Data from the muscle sEMG, and forces collected at the handle were analyzed using repeated measures ANOVA with Tukey’s post hoc test to determine statistical significance (p<0.05). Results found that the participants sEMG activation impulse was less for the turbo tight fastening strategy in comparison to the two-stage fastening strategy with and without soft stop. These findings were not impacted by joint type, posture or target torque.