1 / 12

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

lesa
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related