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Human Motor Development
Using BMI to Determine
Nutritional Status and Disease
Risk
Lab 6.1
Purpose
To better understand how to calculate and interpret body mass index
as it relates to nutritional status and disease risk.
Procedures
1. Measure stature
Place a measuring scale on the wall
and measure standing height (stature).
First obtain a measurement by placing
a ruler or book on the head’s vertex
and reading its intersection with the measurement scale. Repeat the
above measurement, but this time use a triangle headboard. Record
both measurements.
2. Measure body weight
Use a digital scale to obtain body weight. Be sure to remove shoes and to stand quietly in the middle of
the scale. Record the weight measurement.
3. Calculate body mass index
The body mass index score can be calculated using the
BMI = weight 2
(height)
equation to the right, and following sample calculation:
Calculating body mass index (BMI)
Case: Mary is a 46-year-old woman who weighs 132 lb and is 65
in tall. Calculate Mary’s BMI.
1. Convert pounds to kilograms by dividing pounds by 2.2:
132 lb
= 60 kg
2.2 2. Convert height in inches to height in meters by multiplying
inches by 0.0254:
65 in x 0.0254 = 1.65 m
3. Solve the BMI equation by algebraic substitution:
weight
BMI =
(height)2
60 BMI =
1.652
60 BMI =
2.72
BMI = 22.1 kg/m2 (rounded to nearest tenth)
Mary’s BMI of 22.1 kg/m2 is within the recommended healthy
range (19.5–24.9 kg/m2).
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Lab 6.1
Human Motor Development
Lab 6.1
Procedure
(continued)
4. Record your data
Use Worksheet 6.1A to record your stature, weight, BMI, and your nutritional status and disease risk based on
your BMI.
5. Calculate class mean BMI and disease risk
• On a blank sheet of paper, record your BMI, age, and gender; do not include your name. One person should
gather the papers and compile a list of individual scores, ages, and genders for the class and then distribute a
copy of the list to each class member.
• Using Worksheet 6.1B, enter data from the list and calculate the class mean for BMI and for disease risk. To
calculate the class’s disease risk mean, enter the risk classification based on the BMI in column 3, and then
convert the risk to a numerical level:
Underweight/Increased = 2
Healthy weight/Average = 1
Overweight/Increased = 2
Materials Needed
• Tape measure
• Book or ruler
Obesity (Class I)/High = 3
• Triangle headboard
Obesity (Class II)/Very High = 4
• Weight scale
Extreme Obesity (Class III)/Extremely High = 5
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Lab 6.1
Human Motor Development
WORKSHEET
WORKSHEET 6.1
15.1A
Individual Nutritional Status and
Disease Risk Data
Name: _________________________________________
Date: ____________________
Gender:_____________________________ Age:___________________________ years
Body weight:________ kg Height:______________ cm/100 = ______________ meters
Step 1: Calculate your BMI
BMI = body weight in kg / height in m2 = __________ kg / ___________ m2 = __________
Step 2: Determine your nutritional status using the CDC guidelines in Table 6.1A
CDC Classification = ________________________
Table 6.1A CDC (2000) Guidelines for adults.
underweight
BMI less than 18.5
healthy weight
BMI 18.5 to 24.9
overweight
BMI 25.0 to 29.9
obesity
BMI 30.0 to 39.9
extreme obesity
BMI 40 or more
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Lab 6.1
Human Motor Development
WORKSHEET 6.1 A
CONTINUED
Individual Nutritional Status and
Disease Risk Data
Step 3: Determine your disease risk using Table 6.1B
This classification and its numeric equivalent will be used in Worksheet 6.1B.
Disease Risk Classification = ______________________
Table 6.1B Disease risk table.
BMI (kg/m2)
Obesity Class
Disease Risk*
Risk Level Numeric
Conversion
<18.5
Underweight
Increased
2
18.5 to 24.9
Typical (healthy) weight+
Average
1
25.0 to 29.9
Overweight
Increased
2
30.0-34.9
Obesity (Class I)
High
3
35-39.9
Obesity (Class II)
Very High
4
>=40
Extreme Obesity (Class III)
Extremely High
5
* Disease risk for type 2 diabetes, hypertension, and CVD.
+ Increased waist circumference also can be a marker for increased risk, even in persons of normal weight.
Source: Adapted from Classification of Overweight and Obesity by BMI, Waist Circumference, and Associated Disease Risks. USDHHS, National Heart, Lung,
and Blood Institute, https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmi_dis.htm
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Lab 6.1
Human Motor Development
WORKSHEET 6.1 B
Group Nutritional Status and
Disease Risk Data
Name: _________________________________________
Female
Participant
BMI
Disease Risk
Classification*
Risk
Level
Male
Participant
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
Mean
0
Mean
0
Mean
Date: ____________________
BMI
0
Disease Risk
Classification*
Mean
Risk
Level
0
*See Table 6.1B.
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Lab 6.1
Human Motor Development
Discussion
When measuring stature, did you record a different height when using a ruler or book versus using a triangle
headboard? Why would this have occurred?
Compare your body mass index score with the mean values listed in Appendix B.3.
If you are 20-years of age or younger, use Appendix A.6 (males) or Appendix A.8 (females) to obtain your body
mass index percentile rank.
How does your body mass index score compare with the recommended CDC guidelines?
How does your class median BMI compare with the national median presented Appendix B.3?
Discuss your class’s disease risk mean and its significance in regard to developing future health problems.
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