Effects of Work Exposure on Maximum Acceptable Repetition Rates in a Manual Torquing Task

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dc.contributor.authorKant, Ravien
dc.contributor.committeechairNussbaum, Maury A.en
dc.contributor.committeememberBabski-Reeves, Kari L.en
dc.contributor.committeememberKleiner, Brian M.en
dc.contributor.departmentIndustrial and Systems Engineeringen
dc.date.accessioned2014-03-14T20:42:21Zen
dc.date.adate2007-08-30en
dc.date.available2014-03-14T20:42:21Zen
dc.date.issued2006-12-11en
dc.date.rdate2007-08-30en
dc.date.sdate2007-07-31en
dc.description.abstractRepetitive and forceful exertions have been dentified as an important risk factor for occupational injuries. One method used to determine appropriate exposures to these and other risk factors is psychophysics, which is based on individual perceptions of task demands and/or risk. Effects of work exposure have been indicated as of potential importance, but have not been well studied. Indications from an earlier study related to psychophysical limits for a repetitive manual torquing task were that five days of work conditioning had minimal effects on resulting Maximum Acceptable Repetition Rates (MARR). However, it is unknown whether and how longer work exposure durations might influence MARRs. The current study investigated the effects of work exposure on MARR and adjustment time over 10 working days (two weeks) with two days of rest after five days. Ten participants (five males and five females) performed a manual torquing (45 Nm load) task at mid-chest level in the coronal plane for a one hour test session. Starting repetition rate for each participant was set at single high and low rate on alternate days. Temporal (exposure) effects were determined, where day of exposure was the independent variable, and MARR and adjustment time were the dependent variables. Final MARRs were relatively lower during the first few exposure days (14 - 15 repetitions/min) and increased for days 5 - 7 (16 - 18 repetitions/min). On average participants made four adjustments to reach MARR . Day was not found to significantly affect MARR, though week affected both MARR and adjustment time. Thus, an exposure of two weeks may be needed to obtain stable and valid psychophysical limits for manual torquing and, perhaps, related tasks.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07312007-111030en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07312007-111030/en
dc.identifier.urihttp://hdl.handle.net/10919/34277en
dc.publisherVirginia Techen
dc.relation.haspartThesis_Ravi.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectWork Exposureen
dc.subjectMaximum Acceptable Repetition Rate (MARR)en
dc.subjectRatings of Perceived Exertion (RPE)en
dc.subjectManual Torquing Task (MTT)en
dc.subjectPsychophysicsen
dc.titleEffects of Work Exposure on Maximum Acceptable Repetition Rates in a Manual Torquing Tasken
dc.typeThesisen
thesis.degree.disciplineIndustrial and Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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