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Sport Nutrition - Unit 11

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Jonathon Hoare

on 20 October 2014

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Transcript of Sport Nutrition - Unit 11

Sport Nutrition - Energy intake and Expenditure
Assignment 3:
P3 Describe energy intake and expenditure in sports
M1 Explain energy intake and expenditure in sports performance
P4 Describe energy balance and its importance in relation to sports performance
M2 Explain the importance of energy balance in relation to sports performance
D1 Analyse the effects of energy balance on sports performance

Two categories of nutrients?
What nutrients fall into each category?
Calorie content of 1g of fat, protein, carbs?
Why does the body need....
Big Mac
29g fat
46g carbs
25g protein
KFC Original Recipe
Chicken x3 pieces
63g fat
24g carbs
54g protein

Big Mac - 545
KFC ORC - 879
Tesco Wrap - 496
Tesco Chicken
Cesar Wrap
24g fat
46g carbs
24g protein

Energy is measured in calories and joules

Calorie - One calorie is the amount of energy, or heat, needed to raise the temperature of one litre of water by 1°C.

Joule - Is the international unit for energy (We still use calories in Britain).

Is a unit of energy equal to 1000 calories

Is a unit of energy equal to 1000 joules

To convert a calorie into a joule you need to use the following calculation:

1 Calorie = 4.2 Joules

1 kilocalorie (kcal) = 4.2 Kilojoules (kjoules)

Convert the following foods from calories into joules:

Pizza slice = 238 (Kcals)
Packet of Crisps = 133
Mars Bar = 187
Banana = 142
Apple = 53
Meatball Mariana Sub (6”) = 520
Deep-fried Mars Bar = 932


Pizza slice = 238
Packet of Crisps = 133
Mars Bar = 187
Banana = 142
Apple = 53
Meatball Mariana Sub (6”) = 520
Deep-fried Mars Bar = 932

Nutrient Energy Values
Different nutrients provide different energy amounts:

1 gram of Carbohydrate = 4 kcals – 17kj
1 gram of Protein = 4 kcals – 17kj
1 gram of Fat = 9 kcals – 38kj
26g fat
90g carbs
36g protein
Exercise Intensity Exercise Duration Fuel Used
Maximal Sprint Short Carbs
Low-Moderate Up to 2 hours Carbs/Fat
Severe Prolonged Less Carbs
More Fat
Fuel and Exercise
*Protein sources tapped into during latter stages of endurance events if fat and carb stores are low
Body Weight
Body weight, more precisely referred to as body mass,
Some individuals have problems controlling their body weight, often resulting in obesity.
Some sports are categorised based on body weight:-
-Can you think of any examples?
-Can you think of sports where a certain body weight or
type may be required?
Energy and nutrient requirements may also be expressed relative to body mass....
When exercising:
Energy used is directly proportional to exercise intensity
When energy is used up and not replaced, muscles are unable to work at the same intensity
Somatotyping - recognises three basic body shapes (most common method of classification)
heavy build
rounded shape
tends to gain weight

A muscular build
large bone structure

a slim build
long limbs
delicate bone structure
low body fat and muscle content

Lean body mass:
Body composition refers to lean body mass and body fat that makes up total body weight
Includes bone, muscle, water, connective and organ tissues
Percentage Body Fat:
Body fat includes essential and non-essential stores
Unlike basic body type, body composition can be altered
Exercise can increase lean body mass, and decrease body fat
Methods of assessing body fat include:
Bioelectrical Impedance Analysis (body fat %)
Skinfold analysis
Body Mass Index (BMI)
Hip to waist ratio

You are now going to investigate body fat measurement techniques
Get in to pairs, and work through the measuring requirments tasksheet
Log on to a computer and use the internet to find out any information you are unsure of (ie how to complete a measurement, how to calculate a score, classifications)
What is energy balance?
RDA cals:
Men 2500
Women 2000
You are in energy balance when the amount of energy you take in (energy input) equals the amount you expend (energy output)
What happens to your weight if you are in energy balance????

Four major components to energy output:
Resting metabolic rate (RMR) - 60%-75% of total energy output
Dietary thermogenesis (DT) - processes of digestion, absorption, transport and storage of food
Physical activity (PA) - most variable component of total energy expenditure
Adaptive thermogenesis (AT) - expenditure dependent on environmental or physiological stresses placed on the body
What do you think positive energy balance and negative energy balance is?

Basal Metabolism???
To estimate energy requirements, you need to calculate basal metabolic requirements (BMR)
Activity: in pairs

Choose two different sports! e.g. footballer & gymnast

Describe the impact a negative & positive energy balance could have on performance.
Learning check:
Negative or positive energy balance needed for this athlete?
10 - 17 years BMR = 17.7 x W + 657
18 - 29 years BMR = 15.1 x W + 692
30 - 59 years BMR = 11.5 x W + 873

10 - 17 years BMR = 13.4 x W + 692
18 - 29 years BMR = 14.8 x W + 487
30 - 59 years BMR = 8.3 x W + 846
Calculating Basal Metabolic Rate
What's your BMR?
How does it compare to what you consumed yesterday?
Factors Affecting BMR
Reduces with age
Falls around 2% per decade after 30 years old
Males generally have greater muscle mass than woman
Therefore generally have a higher BMR
Taller, heavier people have a higher BMR
BMR increases when the body is subjected to hot or cold climates
The body tries to maintain the body’s internal temperature
Physical Activity
To estimate your total energy requirements you also need to consider your level of physical activity and training
To estimate your total energy requirement multiply your BMR by your physical activity level (PAL)
This is linked with both your occupational and non-occupational activity levels.

“Energy balance” is the relationship between “energy in” (food calories taken into the body through food and drink) and “energy out” (calories being used in the body for our daily energy requirements).
1 cal = _____joules
What fuel is used during a 60m sprint?
What fuel is used during a marathon?
three somatotypes?
three body fat measurement techniques?
Negative and positive energy balance?
4 factors that affect BMR?
Now lets start assignment three!!!
"Good Work"
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