Back-ed - IE 327 1 IE 327 Introduction to Work Design Dr...

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Unformatted text preview: IE 327 1 IE 327 Introduction to Work Design Dr. Andris Freivalds Class #5 http://www.engr.psu.edu/career/ ecw/students/fair.aspx IE 327 2 IE 327 3 MANUAL WORK GUIDELINES • ATP = immediate energy source • Aerobic metabolism → 38 ATP • Anaerobic metabolism → 2 ATP + lactic acid! • E (kcal/min) = 4.9 x oxygen consumption • Limit = E ⅓ max ≈ x 16 = 5.33 kcal/min ⅓ IE 327 4 ENERGY COST OF WORK R=W-5.33 W-1.3 IE 327 5 HEART RATE • HR easier, proportional to energy expenditure • RA = (∆HR/40 – 1) x 100 • ∆HR = working HR – resting HR = 110 – 70 = 40 • RA = (40/40 -1) x 100 = 0 - NO rest needed • RA = (60/40 -1) x 100 = 50% (1 rest for 2 work) IE 327 6 HEART RATE RECOVERY • Brouha guidelines • Measure HR at: – 0.5→1 min (HR 1 ) – 2.5→3 min (HR 2 ) • Acceptable work if: – HR 1 < 110/min – HR 2 - HR 1 ≥ 20/min • Avoid heart rate creep • Short, frequent work/rest cycles IE 327 7 SUBJECTIVE RATING OF PERCEIVED EXERTION • Borg’s rating • Psychophysical • Cheap • Easy • HR/10 IE 327...
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This note was uploaded on 05/04/2010 for the course I E 327 taught by Professor Staff during the Spring '08 term at Penn State.

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Back-ed - IE 327 1 IE 327 Introduction to Work Design Dr...

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