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IE 553 Engineering of Human Work Dr. Andris Freivalds Class #27

IE 553 Engineering of Human Work Dr. Andris Freivalds Class #27. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #27. Intermittent Work (Work/Rest Cycles). Short, frequent W/R cycles are best Self-paced work with spontaneous pauses

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IE 553 Engineering of Human Work Dr. Andris Freivalds Class #27

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  1. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #27 IE 553

  2. IE 553 Engineering of Human Work Dr. Andris Freivalds Class #27 IE 553

  3. Intermittent Work(Work/Rest Cycles) • Short, frequent W/R cycles are best • Self-paced work with spontaneous pauses • For prolonged work, VO2 should be at steady state 412 W IE 553

  4. Task/Work Analysis • Basic requirements for a job/task: • Energy exp < VO2max • Fatigue threshold (?) • Repeatable task • Eave = (Ew×Tw + Er×Tr)/(Tw+Tr) • Ew = [Eave(Tw+Tr) - Er×Tr]/Tw IE 553

  5. Acceptable Job Energy Expenditure • Recommended physical work capacity • ERPWC = VO2max/3 •  uniform work best • excursions worse • static worse than dynamic • large muscles better than localized loading Time Age IE 553 RPWC

  6. Acceptable Job Energy Expenditure • For jobs exceeding RPWC: • Rest allocation or work/rest cycling • Tr = T(Ew - ERPWC) (Ew - Er) IE 553

  7. ENERGY COST OF WORK IE 553

  8. Heart Rate • HR proportional to energy expenditure • ∆HR = working HR – resting HR • ∆HR (Work pulse) ≤ 40 IE 553

  9. Monitoring Fatigue Heart Rate Recovery • Brouha guidelines • Measure HR at: • 0.5→1 min (HR1) • 2.5→3 min (HR2) • Acceptable work if: • HR1 < 110/min • HR1 – HR2 ≥ 20/min • Avoid heart rate creep • Short, frequent work-rest cycles IE 553

  10. Subjective ratings of perceived exertion (RPE) (Borg, 1960) IE 553

  11. Ratings for Work IE 553

  12. Work Efficiency • Gross efficiency (%) = WorkOut/E × 100 • Net eff. (%) = WorkOut/(E-BMR) × 100 • Ex. IE 553

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