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 max x 16 = 5.33 kcal/min 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: 0.51 min (HR 1 ) 2.53 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 Borgs rating Psychophysical Cheap Easy HR/10 IE 327...
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Back-ed - IE 327 1 IE 327 Introduction to Work Design Dr....

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