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BTEC Sport Unit 4 - Energy systems

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Jo Raw

on 18 May 2015

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Transcript of BTEC Sport Unit 4 - Energy systems

Why do we need energy?
The body needs a steady supply of energy to enable it to perform functions necessary to stay alive.

- Muscular Contractions and Movement
- Blood Circulation
- Transmission of nerves
- Food Digestion
- Repairing and replacing tissue
- Cell growth
- Gland Secretion
Sporting Example?
Write down your own sporting examples of this
BTEC Level 2 Firsts in SPORT
Energy Systems
Today's Learning Objectives:

1. Know the different types of ENERGY SYSTEMS

a) ATP - PC System
b) Lactic Acid System
c) Aerobic System

2. Understand when those energy systems are used

3. Be able to compare and contrast how they are used

Try and remember what the definitions for Aerobic and Anaerobic Respiration are.......
Aerobic Respiration: with O2

glucose + oxygen ---→ carbon dioxide + water (+ energy)

Anaerobic Respiration: without 02

glucose ---→ lactic acid (+ energy released)

Aerobic Energy System
up to 20-40 secs
10 secs - 4 mins
a lactic acid system
There are three main types of energy system
(2 anaerobic and 1 aerobic)
Sporting Example?
Write down your own sporting examples of this
Sporting Example?
Write down your own sporting examples of this
In detail
Usually long periods of time
Adenosine Triphosphate
is the molecule that provides energy for all living things.

is stored in the muscles and is used when a fast burst on energy is needed quickly.

Why is it best stored in the muscles?

It gets used up very quickly and stores are depleted. They are replenished after 2-3 minutes of rest.

Creatine Phosphate (CP)
is used to help replenish the stores of ATP. It is also used as a fast burst energy source AFTER ATP has run out...this provides an additional 16 seconds or so.

CP is only replenshed through the oxygen breathed in through aerobic respiration.

When ATP/CP runs out glycolysis takes over.
Glucose for energy is stored in the liver and in the muscles and is converted to pyruvate and the energy released during this process forms ATP.

That ATP can the be stored and used again in the ATP/CP cycle.

The ATP/CP and the alactic system work together for up to 4 minutes.

These systems cannot remove waste products such as lactic acid - no oxygen to do this. LA builds up in muscles and cells and causes........?

The more intense the exercise the faster the
LA builds up and the quicker the athletes tires.
Removal of Lactic Acid
Getting rid of LA is a much longer process.

It can take over an hour to get LA levels back to normal using resting breathing and oxygen.

ACTIVE RECOVERY - Light walking or a cool down allows LA to be removed from muscles after high intensity exercise much more effectively than resting - why?
The aerobic system requires oxygen which re-uses ATP to create the energy required.

It is used in low intensity exercise and is also vital when recovering from high intensity exercise. Why?

The health and efficiency of the heart and the lungs are vital in aerobic respiration as we need them to process the oxygen quickly to repay our O2 Debt.

We use OVERLOAD in training to strengthen our aerobic system - stretching its capabilities - so an aerobic session should last

longer than 20

Working together
The 2 anaerobic systems and the aerobic system will often work together for activities lasting between 4 and 10 minutes.

After 10 minutes the aerobic system will work alone.
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ATP/CP - alactic acid system
Glycolysis/lactic acid energy system
Aerobic energy system
Full transcript