W2 B Energy Efficiency & Energy Balance

Question 1

How do you work out efficiency (the four types)?

Answer 1

1. Gross efficiency (%) = (Work accomplished / Energy expended) x 100
2. Net efficiency (%) = (Work accomplished / Energy expended - REE) x 100
3. Work efficiency (%) = (Work accomplished / Energy expended - EE in unloaded) x 100
4. Delta efficiency (%) = (Change work accomplished / Change EE) x 100
   (Delta is the most effective & complex but is the hardest to measure)

Question 2

What’s positive & negative balance?

Answer 2

Positive Energy Balance = more out than in

Negative Energy Balance = more in than out

Question 3

Total Daily Energy Intake (TDEI) =

Answer 3

Total Daily Energy Expenditure (TDEE)

Question 4

Name 4 methods for measuring expenditure:

Answer 4

1. Direct Calorimetry Chamber
2. Respiration Chamber
3. Douglas Bag Technique *Indirect Calorimetry
4. Breath by Breath Systems *Indirect Calorimetry

Question 5

What is the Energy Cost of Running per Kg of body mass per Km?

Answer 5

1 Kcal per Kg of body mass per Km

Question 6

What’s the upper limits of energy expenditure of kcal per day?

Answer 6

9000-11000 kcal per day

that’s 11 beef burgers or 65 Lucozade Sports!

Question 7

What’s the lower limits of energy expenditure of kcal per day?

Answer 7

1000-1500 kcal per day (that’s with lots of exercise)

Question 8

Name different methods of energy intake.

Answer 8

• 24H recall
• 3 day food diary
• 7 day diary
• Food frequency questionnaire
• Diet History