Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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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?
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**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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