A–D
I’ve got the power
How does the body respond to changing energy needs?
Lesson 1
Experiment A: How much power do my muscles generate?
Each group will need:
Equipment
Comments
From school
1 stopclock
1 gym bench/aerobic step/
sturdy box/stair
height 0.25–0.3 m
bathroom scales
in case students forget to measure their mass at home
1 ruler, metre
to measure step height
metronome
optional – to help keep time
music
optional – to help keep time
tally counter
optional – to keep a tally of repetitions completed
Lesson 2 – Carousel of experiments
The tables below show the equipment required for one station for each experiment within the
carousel. Depending upon the equipment available to each class and the number of students
in the class, you may wish to provide more stations for one or more of the carousel
experiments.
Experiment B: What does being fit mean?
Each carousel workstation will need:
Equipment
Comments
From kit box
1 pulse oximeter
requires 2 × AAA cells. Do not use lithium cells and avoid
mixing different types, e.g. zinc chloride and alkaline refer to
page 7 ‘How to use the equipment in the box’ in this guide
for instructions
1 tape measure
stadiometers could be used for measuring standing height
instead
From school
1 stopclock
1 gym bench/aerobic step/
sturdy box/stair
height 0.25–0.3 m, and higher if possible
stadiometer
optional – tape measures could be used instead
metronome
optional – to help keep time
Ages
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108
16–19
A–D
I’ve got the power
Experiment C: Does carbon dioxide increase in my breath after exercise?
Each carousel workstation will need:
Equipment
Comments
From kit box
1 respirometer pack (1
plastic 2-litre bottle, bung,
piece of plastic tubing,
piece of flexible tubing,
one-way valve)
refer to the diagram on page 89 of this guide for assembly
instructions
one piece of flexible tubing in the kit box has the valve fitted
for extra stations, the flexible tubing will need to be cut in
half (2 × 12.5 cm lengths) and rejoined with the valve in the
middle of them; the ends screw in
5 g provided in kit as a solid
prepare a stock solution of 0.1% bromothymol blue:
●
●
bromothymol blue indicator
solution (low hazard)
●
●
0.3 g bromothymol blue dissolved in 150 ml deionised
water.
To obtain 1 litre of working solution, dilute 30 ml of stock
solution to 1000 ml with deionised water.
The solution may appear blue or green depending on
the pH of the stock water. To adjust the colour to just
green (neutral) add 0.1 M sodium hydroxide drop wise
but do not add to excess.
Each group will require 1500 cm3 of working solution.
The quantity of stock solution above will produce 10
litres of working solution, enough for six groups.
0.1 M sodium hydroxide
solution
each group needs less than 20 cm 3
add a label to each bottle, before giving to students to
use, indicating that it is an irritant
1 indicator chart
for colour comparison of bromothymol blue
pipette, 3 ml
for measuring the volume of sodium hydroxide solution
added (5 cm3 is required, so students will have to refill the
pipette)
From school
1 stopclock
safety goggles (1 per
student)
disinfectant or sterilising
solution
to sterilise flexible tubing before and after each use
disinfectant must always be freshly prepared prior to use
and must be active against viruses e.g. chlorine-based such
as a diluted bleach solution or a persulphate compound
such as Virkon™
tubes should remain in the disinfectant for 24 hours and well
rinsed prior to next use
2 test tubes
1 test tube rack
1 measuring cylinder
to measure out 500 cm3 of bromothymol blue solution
Ages
16–19
107
A–D
empty, washed, 2 litre
plastic bottle
the kit box includes 1 plastic 2-litre bottle; depending on
how many stations you set up for Experiment C you will
need more cola-type drink bottles
1 skipping rope
optional
1 gym bench/aerobic step/
step stool/sturdy box/chair
height 0.25–0.3 m, optional
video clip of Zumba® or CD
of fast dance music
optional
Experiment D: What happens to my heart rate and blood pressure when I exercise?
Each carousel workstation will need:
Equipment
Comments
From kit box
1 pulse oximeter
requires 2 × AAA cells. Do not use lithium cells; avoid
mixing different types, e.g. zinc chloride and alkaline
refer to page 7 ‘How to use the equipment in the box’ in this
guide for instructions
1 blood pressure monitor
requires 1 × AA 1.5 V cell
refer to page 10–11 ‘How to use the equipment in the box’
in this guide for instructions
From school
1 stopclock
Ages
16–19
108