Applied Nutrition
Practical Exercise in Exercise Physiology
Introduction:
This practicum is designed to illustrate and measure physiological changes associated with exercise
Students will work in groups of the or four. One student will act as the subject and the other students in the group will take measurements. Measurements will be taken of the subjects pulse breathing rate, body temperature and blood pressure before exercise and following various activities.
Method
1) Resting Measurements
Measure the subjects resting breathing rate by observing her chest movement and counting the number of breaths in one minute. Count the pulse rate and take body temperature with a clinical thermometer. Take three measurements each time. Measure the exact height of the step used.
2) Mild exercise
The subject is to step up one ca. 400 cm step at a rate of 2 step up per second for 2 minutes
Then the same measurements as performed on the resting subject are repeated
The above test (2) should be repeated three time with a 5 min. rest in between.
Measure the exact height of the steps used.
Medium exercise
The subject is to step up three ca. 400 cm steps at a rate of 2 x 3 steps up per second for 2 minutes
Then the same measurements as performed on the resting subject are repeated
The above test (3) should be repeated three time with a 5 in rest in between.
Measure the exact height of the steps used.
Greater exercise
The subject is to step up several ca. 400 cm steps at a rate of X step up per second for 2 minutes
The number of steps to depend on the fitness of the subject
Then the same measurements as performed on the resting subject are repeated
The above test (4) should be repeated three time with a 5 in rest in between.
Measure the exact height of the steps used.
Rebreathing exercise
The subject is to remain seated and to breath in and out of a plastic bag 5 times at a normal breathing rate.
Then the same measurements as performed on the resting subject are repeated
The above test (5) should be repeated three time with a 5 min. rest in between.
Results
Tabulate all measurements using MKS units
Calculate the Energy need to take the steps in each of parts 1 to 4 of the practicum
using the formula E = mgh .
Calculate the power used from E/time
Calculate the number of grams of fat needed to provide the energy in each part.
Using the number of kJ/ gram of fat.
Plot graphs of each physiological parameter against power use.
Questions:
Explain why the physiological measurements change with each part of the experiment.
Explain why pulse and breathing may not indicate a true measure of increased metabolism
Explain why the actual amount of fat used in the exercise is much greater than indicated in the calculations above. How can this vary from one subject to another.
Why was fat used for calculating the amount of nutrient used and not carbohydrate? Under what conditions could this change?
How could respiratory quotient be used to determine which nutrient is being utilized?
Queens College Step Test Equipment: 41 cm high bench, stopwatch, metronome, pulse monitor (optional). Target Population: Large groups or those incapable of doing a maximum test. Advantages: Limited equipment and expertise needed, large groups can be tested at once, test can be self administered. Disadvantages: Test tends to underpredict the values of fit adults. The test is sometimes unsuitable for short subjects and favours males due to the height of the bench. Procedure: A three minute step test on a 41 cm bench. Stepping pace:Women 22 steps/min, Men 24 steps/min. Subjects step using a fourstep cadence, 'UPUPDOWNDOWN' continuously for 3 minutes and then immediately take their pulse for 15 seconds, 520 seconds into recovery. Multiplying this 15 second reading by 4 will give the end beats per minute figure of the subject. Using the linear relationship between heart rate and oxygen consumption the subjects one minute end test pulse reading can be used to predict a value for their Max VO2. 

(Test End Pulse Results in BPM) 
Excellent 
Good 
Average 
Fair 
Poor 



Males under 18yrs 
<120 
120130 
131150 
151160 
>160 



Males over 18 yrs 
<110 
100124 
125140 
141155 
>155 



Females under 18 yrs 
<124 
124134 
135154 
155164 
>165 



Females over 18 yrs 
<116 
116130 
131146 
147160 
>160 



