Slide 1Slide 2Shiftwork & ProductivityShiftworkShiftwork RecommendationsSample Rapid Rotations - 1Sample Rapid Rotations -2Sample Rapid Rotations -3OvertimeProductivity and OvertimeProductivity and ArousalYerkes-Dodson LawIndividual VariabilityLab #3IE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #32IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #32IE 5533Shiftwork & Productivity Circadian Rhythms:• Homeostasis → rhythmic stasis• 24-hr rhythm synchronized to light/dark cycleIE 5534Shiftwork•Desynchronization, isolate in caves•Free running → 25 hours•Endogenous vs. exogenous•Introvert vs. extrovert•Problems with shiftwork:–25% of US workers–Conflicts with sleep, social/health problems•Two opposite approaches: –Extended rotation (permanent?) –Rapid rotation, weekly worst!!IE 5535Shiftwork Recommendations1) Avoid for workers over 502) Use rapid rotations vs. weekly or monthly cycles3) Schedule few night shifts (<3) in succession4) Use forward rotation (e.g. E-L-N or D-N)5) Limit total working shifts in succession to <76) Include some free weekends, with at least two successive fully days off7) Schedule rest days after night shifts8) Keep plans simple, predictable and equitable for all workersIE 5536Sample Rapid Rotations - 1IE 5537Sample Rapid Rotations -2IE 5538Sample Rapid Rotations -3IE 5539Overtime•Defined as extended work periods (> 8 hrs)•Not recommended for extended time–12 hr shifts, 3 days on, 3 days off–Regular 10 hour days•Increased risk for WRMSDs (↓recovery)•Do not gain expected productivityIE 55310Productivity and OvertimeIE 55311Productivity and ArousalArousal PerformanceLow HighLow 1 2 (best)High 4 (worst) 3IE 55312Yerkes-Dodson LawLow HighLow 1 2High 4 3IE 55313Individual Variability•Introvert: runs on high internal arousal, external only ↑ stress•Extrovert: runs on external arousal, can handle ↑ stress•Arousal = physiological strain–Requested action contrary to goals–High information processing–Secondary task demands, environmental demands•Physiological measurements to measure arousal ≈ cognitive performanceIE 55314Lab #3Objectives:1) Estimate VO2max 2) Validate Garg's model 3) Estimate work with HR4) Work with Borg RPEProcedures:1) 3 workloads (60,120, 180 W)2) Measure: VE, HR, Borg 3) Estimate VO2max4) Two lifting tasks5) Estimate VO2max6) Compare measured E with Garg’s
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