Work Physiology

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Work Physiology

• IENG 321
• SDSMT
• Spring 2006

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Reading Assignment

• Read Konz Johnson
• Pages 47-58

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Metabolism

• Metabolism energy consumption of the body
• Basal maintain life (body temperature, body
  functions, blood circulation
• 1.16 W/kg for females
• 1.28 W/kg for males
• (women tend to have a higher percentage of fat)

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Activity Metabolism
Activity W/kg
Eating, writing, sitting quietly 0.4
Driving a car 1.0
Washing floors 1.4
Heavy carpentry 2.7
Weeding a garden 4.5
Playing tennis 5.8
Sawing wood 6.6
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Digestion Metabolism

• Transformation of food within the body
• 4 kcal/g carbohydrate
• 9 kcal/g fat
• 4.3 kcal/g protein
• 7 kcal/g - alcohol

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Calories Required

• Metabolism is related to calories and body weight
• Assume a 70 kg male (154 lbs)
• Basal metabolism 70(1.28) 89.6 W
• 89.6W(0.86 kcal/W-h)(24 h) 1849 kcal
• Assume activity of 0.7 W/kg for 16 hours
• 0.7(70)(.86)(16 h) 674 kcal
• Total of 2523 kcal
• Assume 10 needed for digestion
• 2523(1.1) 2775 to maintain weight

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Metabolic Cost of Walking/Running/Carrying

• Walking without a load
• C(2.73.2(v-0.7)1.65)), W/kg
• C Terrain coefficient
• 1.0 blacktop, 2.1 sand, etc.
• V velocity, m/s
• Running
• -142/WT 11 0.04 V2, W/kg
• V velocity, km/h
• Carrying/Standing
• 1.5WT 2(WTWTL)(WTL/WT) 2
  C(WTWTL)(1.5v20.35vG)
• WTL weight of load on shoulders, kg
• V velocity of walking, m/s
• G Grade,

See Box 4.6 for details
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Response to Exercise

• Cardiovascular system has five responses to
  exercise
• Heart rate
• Stroke volume
• Artery-vein differential
• Blood distribution
• Debt

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