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

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IE 327 1 IE 327 Introduction to Work Design Dr. Andris Freivalds Class #5
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http://www.engr.psu.edu/career/ ecw/students/fair.aspx IE 327 2
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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 max x 16 = 5.33 kcal/min
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IE 327 4 ENERGY COST OF WORK R=W-5.33 W-1.3
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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)
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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
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IE 327 7 SUBJECTIVE RATING OF PERCEIVED EXERTION Borg’s rating Psychophysical Cheap Easy HR/10
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IE 327 8 LOW BACK COMPRESSIVE FORCES
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