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BTEC Level 3 National Sport
Transcript of BTEC Level 3 National Sport
Energy Intake and Expenditure in Sports Performance
Energy is obtained from the foods you eat and used to support your basal metabolic rate and all activity carried out at work and leisure.
Sources of Energy
Fats - 1 gram fat = 9.0kcal = 38kj
Carbohydrates - 1 gram carb = 4.0 kcal = 17kj
Proteins - 1 gram protein = 4.0 kcal = 17kcal
Energy balance: when energy intake (food and drink) equals energy expenditure. Weight here is maintained.
P3. Describe energy intake and energy expenditure in sports performance (powerpoint).
M1. Produce a fact sheet for a specific sport to explain energy intake and energy expenditure.
P4. Consider the importance of energy balance in sport (powerpoint).
M2. Explain the role of body composition assessment in the achievement and maintenance of energy balance in the athlete.
Basal Metabolic Rate:
The minimum amount of energy required to sustain your body's vital functions in a waking state.
Fuel sources available to exercising muscles are listed below. Their relative value as fuels differ.
Protein may be used during prolonged periods of exercise and towards latter stages of endurance events, particularly if fat and carbohydrate as sources of fuel have become limited.
Four components of Energy Output:
Positive Energy Balance: when energy intake exceeds expenditure.
Negative Energy Balance: If energy intake is less than expenditure.
Resting Metabolic Rate (RMR);
Dietary Thermogenesis (DT);
Physical Activity (PA);
Adaptive Thermogenesis (AT).
Represents the most variable component of your total energy expenditure.
This is the additional energy expended above RMR and DT and will contribute more to total daily energy expenditure in active adults.
How much PA depends on how active general lifestyle is.
How often, how energetically.............
how long you participate in PA and what type of PA it is.
The Key Facts
Energy expenditure that occurs as a result of environmental or physiological stresses placed on the body.
Examples of stresses on the body include.....
changes in temperature
This may require you to respond by shivering.
or stress that causes anxiety or fidgeting.
The Key Facts
Refers to the energy expended above that of the RMR for the processes of digestion, absorption, transport and storage of food.
It is influenced by the calorie content and composition of your diet along with your individual nutritional status.
High energy intakes and a refular eating pattern are thought to help maintain higher rates of DT.
Skipping meals and restrictive dietary practices lead to a reduction in the component of total energy expenditure.
The Key Facts
Can account for 60-75% of total energy output and represents the largest component of total daily expenditure.
Closely related to lean body mass and is so influenced by body composition.
Muscle tissue is much more metabolically active than fat tissue.
Gains in muscle mass will result in increases in RMR.
RMR is influenced by age, sex and genetic background.
Resting Metabolic Rate
The Key Facts
Using the information below, calculate your BMR and total daily energy requirements and record your answers in kcal per day.
Male Age BMR in kcal per day (W= weight in kg)
10-17 BMR = 17.7W + 657
18-29 BMR = 15.1W + 692
Female Age BMR in kcal per day (W= weight in kg)
10-17 BMR = 13.4W + 692
18-29 BMR = 14.8W + 487
D1. Analyse the effects of energy balance
on sports performance.
P3. Consider the importance of energy balance in sports performance.
M1. Consider the role of sports drinks, and energy gels and bars on achieving and maintaining energy balance.
P4. Describe energy balance and its importance to sports performance.
M2. Explain the importance of these measures in achieving and maintaining energy balance in the athlete.
D1. Consider examples from different sports and categories of athletes.