SBI3C Name: ______
Body Measurements Activity
Body Mass Index (BMI):
Your BMI is an indicator of percentage of body fat. To calculate your BMI...
1. Measure your weight in kilograms: ______kg
2. Measure your height in centimetres: ______cm
...convert it into metres: ______m
...square your height in metres: ______m2
3. Divide your weight (kg) by your height squared = ______kg/m2
This is your Body Mass Index (BMI). "Normal" BMI is between 18.5 and 24.9 kg/ m2.
How do you compare? Do you think that this is an accurate estimate of % body fat?
Measuring Body Fat (*this is optional*):
According to the government of Canada (http://www.hc-sc.gc.ca), waist circumference (WC) indicates the amount of abdominal fat you have. Men with WC above 102 cm, and women with WC above 88 cm may have an increased risk of developing health problems such as diabetes, heart disease, and high blood pressure.
Use the measuring tape to measure your waist circumference: ______cm
You can also use calipers to measure your body fat.
To measure body fat on your waist, pinch horizontally just above your hipbone, between your side and belly button, and measure the fat with the calipers. How much fat did you measure at your waist? ______mm
In order to calculate your percentage body fat, you need to add up measurements from 4
different areas, including the waist. To estimate your % body fat using calipers, have a look at:
http://www.muscleandstrength.com/tools/how-to-measure-bodyfat-using-calipers.html.
According to the American Council on Exercise, average body fat in women is 25-31%, and in men 18-24%. (See: http://www.builtlean.com/2010/08/03/ideal-body-fat-percentage-chart/)
Heart Sounds (Adapted from "Mini Investigation" page 498)
A normal resting heart rate for adults ranges from 60 to 100 beats per minute.
1. Use an alcohol towelette to clean the ear pieces of the stethoscope. Place the stethoscope on
your own chest and listen for a heart sound. Where on your chest did you hear the clearest
sound? ______
2. Count the number of beats in 10 seconds (and multiply by 6) or count the number of beats in 60
seconds. Record your resting heart rate (bpm): ______
3. After moderate exercise (down & up the staircase), listen to your heart again and record your heart
rate after exercise (bpm): ______
Measuring Blood Pressure (Adapted from "Mini Investigation", page 477)
"Normal" blood pressure is 120/80 mm Hg. "High" blood pressure is 140/90 mm Hg or above. "Low blood pressure is 90/60 mm Hg or below.
1. Make sure that you are seated.
2. Measure your resting blood pressure using the sphygmomanometer. Follow the instructions in the
manual. Repeat once or twice and calculate an average value.
Trial 1 / Trial 2 / Trial 3 / Average Value:systolic pressure
diastolic pressure
heart rate (bpm)
Determining Lung Volumes (Adapted from Investigation 10.2.1, page 465)
Your tidal volume (volume of a normal breath) and your maximum lung capacity can be used as indicators of health. In a healthy, young human adult, tidal volume is approximately 500 mL per inspiration or 7 mL/kg of body mass.
1. Use the spirometer to measure your lung capacity. Set the gauge on the spirometer to zero and
attached a new, unused mouthpiece. Breathe normally for a few breaths to establish a regular
breathing pattern.
Tidal Volume (TV):
2. After a normal inhalation, place the mouthpiece in your mouth and exhale normally. Record the
volume of air exhaled in the chart as your tidal volume. Repeat this once or twice, resetting the
gauge each time. Calculate & record an average value.
Expiratory Reserve Volume (ERV):
3. Reset the gauge to zero. Exhale normally and place the mouthpiece in your mouth. Continue to
exhale as much air as possible and record the volume of air exhaled. This is your expiratory
reserve volume (ERV). Repeat this once or twice, resetting the gauge each time. Calculate &
record the average value.
Vital Capacity (VC):
4. Reset the gauge to zero. Inhale as deeply as possible and place the mouthpiece in your mouth.
Exhale as much air as possible. Record the volume of air exhaled. This is your vital capacity
(VC). Repeat this once or twice, resetting the gauge each time. Calculate & record the average
value.
Trial 1 / Trial 2 / Trial 3 / Average Value:Tidal Volume (TV)
Expiratory Reserve Volume (ERV))
Vital Capacity (VC)
*See Figure 6, page 443, for a graph of these lung volumes.*
Use your data and the graph to calculate your inspiratory reserve volume (IRV): ______cm3