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Reference chapter

Question 1
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FEEDING, BREATHING AND ACTIVITY

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Question 1

 

Activity

Energy Used
/KJ per hour

Sitting

80

Typing

117

Dusting

460

Walking

774

Mining coal

1339

Rowing

1506

Cycling

1632

Swimming

1883

Running

3766

Answer the following questions:

 

(a) The marathon is a race which is 42km long. using the information on the table above, estimate how much energy in kilojoules a marathon runner would need if:

  1. he finished in 2hours 6 minutes and 50 seconds

  2. she finished in 2 hours 21 minutes and 6 seconds

(b) While running the marathon the athletes are given specially prepared drinks to replace the water, salts and vitamins that they lose. It also gives them energy. The composition of one of these drinks, called Isostar, is shown opposite:

 

 

Every 100g of ISOSTAR contains:

Lipids

0,00g

Proteins

0,00g

Sugars

7,60g

Sodium

50mg

Calcium

15mg

Potassium

11mg

Magnesium

5mg

Vitamin C

3,1mg

Vitamin B1

0,05mg

Vitamin B2

0,12mg

PP (a vitamin)

0,10mg

Pantothenic acid (a vitamin)

0,20mg

(i) Which part of this drink contains the most energy?

(ii) In general:

1g lipid = 37kJ

1g protein = 17kJ

1g sugar or starch = 17kJ

How much energy would a 250g can of this drink contain?

(iii) How many cans of drink would a marathon runner need to drink to obtain all the energy that he needs for the race if

  1. he ran the race in 2h 6min 50s?

  2. she ran the race in 2h 21mins 6s?

(iv) Find out what kind of diet a marathon runner must have if he or she is preparing for a race. (You can ask your sports teacher for ideas.)

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