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Malcolm, a 255 lb man walks at 4 mph, 5% grade for 45 min. What was Malcolm's caloric expenditure? If Malcolm exercised at this intensity 5 times a week, how long would it take him to loose 20 lbs?

Malcolm, a 255 lb man walks at 4 mph, 5% grade for 45 min. What was Malcolm's caloric expenditure? If Malcolm exercised at this intensity 5 times a week, how long would it take him to loose 20 lbs?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Problem Statement:** Malcolm, a 255 lb man walks at 4 mph, 5% grade for 45 min. What was Malcolm’s caloric expenditure? If Malcolm exercised at this intensity 5 times a week, how long would it take him to lose 20 lbs? --- **Explanation:** 1. **Caloric Expenditure Calculation:** - Walking Speed: 4 mph - Grade: 5% - Weight: 255 lb - Duration: 45 min To calculate caloric expenditure for walking at a specific speed and incline, online calculators or specific formulas based on METs (Metabolic Equivalent of Task) are often used. However, a generalized estimate can be used for illustration. 2. **Caloric Expenditure Example:** - Using an online calorie calculator: - A 255 lb man walking at 4 mph at a 5% incline burns approximately 8.5 calories per minute. - Total calories burnt = 8.5 calories/minute * 45 minutes = 382.5 calories per session. 3. **Weekly Caloric Expenditure:** - Exercise sessions per week: 5 times - Weekly calories burnt = 382.5 calories/session * 5 sessions = 1,912.5 calories per week. 4. **Weight Loss Calculation:** - 1 pound of weight loss is approximately equal to burning 3,500 calories. - To lose 20 lbs: - Total calories needed to burn = 20 lbs * 3,500 calories/lb = 70,000 calories. - Total weeks required = 70,000 calories / 1,912.5 calories/week = 36.6 weeks. --- **Conclusion:** Malcolm would take approximately 37 weeks of exercising at this intensity 5 times a week to lose 20 lbs.
Transcribed Image Text:**Problem Statement:** Malcolm, a 255 lb man walks at 4 mph, 5% grade for 45 min. What was Malcolm’s caloric expenditure? If Malcolm exercised at this intensity 5 times a week, how long would it take him to lose 20 lbs? --- **Explanation:** 1. **Caloric Expenditure Calculation:** - Walking Speed: 4 mph - Grade: 5% - Weight: 255 lb - Duration: 45 min To calculate caloric expenditure for walking at a specific speed and incline, online calculators or specific formulas based on METs (Metabolic Equivalent of Task) are often used. However, a generalized estimate can be used for illustration. 2. **Caloric Expenditure Example:** - Using an online calorie calculator: - A 255 lb man walking at 4 mph at a 5% incline burns approximately 8.5 calories per minute. - Total calories burnt = 8.5 calories/minute * 45 minutes = 382.5 calories per session. 3. **Weekly Caloric Expenditure:** - Exercise sessions per week: 5 times - Weekly calories burnt = 382.5 calories/session * 5 sessions = 1,912.5 calories per week. 4. **Weight Loss Calculation:** - 1 pound of weight loss is approximately equal to burning 3,500 calories. - To lose 20 lbs: - Total calories needed to burn = 20 lbs * 3,500 calories/lb = 70,000 calories. - Total weeks required = 70,000 calories / 1,912.5 calories/week = 36.6 weeks. --- **Conclusion:** Malcolm would take approximately 37 weeks of exercising at this intensity 5 times a week to lose 20 lbs.
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