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Feeding, Breathing and Activity : Question 1
 Name: Class: School: Date:

 Activity Energy Used /KJ per hour Sitting 0080 Typing 0117 Dusting 0460 Walking 0774 Mining coal 1339 Rowing 1506 Cycling 1632 Swimming 1883 Running 3766

(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:

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

B. 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?

Space for calculation:

(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

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

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

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

- 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.)