Reaction torques and operator stress while using powered nutrunners

Andris Freivalds, Jörgen Eklund

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


Reaction torque measures of six different nutrunners were correlated with EMG measures and subjective ratings of perceived exertion for different work surface orientations, joint stiffnesses, rpm levels, air pressure levels and handle configurations. Using an underpowered tool or using a softer joint resulted in larger impulses and worse ratings. A pulse-type shut-off mechanism produced the lowest reaction torque and the best rating. Overall, ratings correlated directly with the impulse level. The subjects were good judges of stress levels, and subjective ratings were valid measures of operators stress.

Original languageEnglish (US)
Pages (from-to)158-164
Number of pages7
JournalApplied Ergonomics
Issue number3
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Human Factors and Ergonomics
  • Physical Therapy, Sports Therapy and Rehabilitation


Dive into the research topics of 'Reaction torques and operator stress while using powered nutrunners'. Together they form a unique fingerprint.

Cite this