PURPOSE:
The purpose of the lab is to...
    1) determine how much work the human body can do based upon the energy input of the food eaten.

    2) determine the efficiency of the human body.

MATERIALS:
Food, calorie books, food labels, human

PROCEDURES:
1) Keep a record of everything that you eat for a 24-hour period. The day of the data collection will be given to you by your instructor You must record the following

• Exact type of food eaten. If the food is a combination of ingredients then record each of the ingredients as best you can.
• Exact amount of food eaten. In some cases this will be an approximation but try to be as accurate as possible.
• If the food package has a nutritional statement on the label, record the calories of the amount of the food that you ate.

2) Using a calorie book from either class, the internet, or the library, record next to each it

• http://www.thecaloriecounter.com/
• http://www.calorie-count.com/

3) Add up the total amount of Joules that you consumed in the 24-hour period.

4) Convert the amount of each food calorie to regular energy units (Joules) by multiplying the food calories by 4184. This will yield the energy in Joules.

5) The human body is only 20% efficient. Using this value, find the total amount of Joules available for useful work and record this value.

6) Using the following numbers, calculate the energy you used for each activity

1. Sleeping = 40 cal/hr
2. Homework = 50 cal/hr
3. Standing = 60 cal/hr
4. Easy Walking = 80 cal/hr
5. Swimming/Aerobic activity/Jogging = 600 cal/hr
6. Racing/Sprinting (rowing, swimming, running) = 1200 cal/hr

7) Add up all the total sum of calories used for the day. Convert to Joules.

DATA:

QUESTIONS:

1. What was your total caloric intake for 24 hours?
2. What was your total Joule intake for 24 hours?
3. How many Joules did you have available for useful work?
4. Based upon the answer to question 2, answer the following: (GPE = energy available = mgh, use g = 10 m/s²) -- USE 5 STEPS!!!
   1. How high could you lift 1 kg mass?
   2. How high could you lift your own mass?
5. How efficient is your body according to your numbers?
6. If 1.67 x 10⁷ J equals one pound of body weight, how much body weight did you lose or gain? (Fractions of pounds are OK. Hint: take the different between your Joules in and your Joules out and divide by the Joules per pound)