Energy Continuum

Fitness Level

Buffering capacity increases, limiting effects of lactic acid accumulation and the removal of lactic acid is improved

An athlete with high aerobic capacity (VO2 max) has an effective CV and respiratory system to inspire, transport and use great volumes of oxygen

This increases the intensity they can work at before OBLA is reached and fatigue sets in

ENERGY CONTINUUM

Additional oxygen demand to use FFAs can be met, conserving glycogen stores for high-intensity bouts, increasing duration of perfomance

Oxygen arrives earlier, minimising time spend in glycotic system accumulating lactic acid

Recovery Periods

• PC stores are depleted and replenished quickly - 50% in 30seconds, 100% after 3minutes.

Additional Factors affecting relative contributions

• Oxygen stored in myoglobin depleted after bouts of exhaustive exercise can be relinked in 3 minutes of rest/low intensity

• Breaks in sport aid recovery and maintain intensity of the game

• Blood lactate levels can rise with prolonged high-intensity bouts and accumulate with repeated use of glycoltic system without sufficient relief

• Position of player
• Tactics and strategies used
• Level of competition
• Structure of game

• With correct work:relief ratios, lactic acid can be broken down and removed. Lactic acid removal is aided by low-intensity activity

Read page 14, adding any information you find beneficial

Analyse the graph on page 12

% of energy supplied by each energy system

In a pair, summarize the graph, commenting on:

• Lactic acid levels
• type of activity
• Relationship between muscle gylcogen and lactic acid between points A and B

Intensity low-moderate: duration >3min

Continued...

Correct the Mistake

Aerobic system will be predominant. contributing 99% of energy for ATP re synthesis

• Based on intensity/duration of activity, an indication of the contributions each system makes to overal energy production can be made
• This helps design effective training programmes

Intensity high: duration 10 secs - 3min

Glycolytic system will be predominant, contributing 60-99% of energy ofr ATP resynthesis

ADD ANOTHER ACTIVITY TO EACH INTENSITY:DURATION

Intensity very high: duration <10 secs

ATP-PC system will be predominant, contributing 99% of energy for ATP resynthesis

Energy Continuum

Threshold

What system is dominant in each activity?

• Energy continuum is the relative contributions of each energy system to overall energy production
• Depends on intensity and duration of exercise
• Normally, all energy systems contribute to all activites

Relative contributions of aerobic and anaerobic energy production

Using pg. 11 as a guide, fill in:

• ATP-PC/glycolytic threshold
• Glycolytic/aerobic threshold

You must use a different sport!

Intermittent Exercise

Learning Intentions

• Intermittent exercise = activity where the intensity alternates, either during interval training between work and relief intervals or during a game with breaks of play and changes in intensity.

• Research shows intermittent exerise to be more energy demanding than continuous exercises

Know and understand the respiratory responses to exercise

Describe the changes to breathing rate, tidal volume and minute ventilation

Evaluate the differences between an untrained and trained performers respiratory response to exercise1

• Point at which an athletes predominant energy production moves from one energy system to another is known as threshold
• A performer can move between any of the energy systems depending on intensity and duration of the activity and fuels avaliable