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GUNGAHLIN COLLEGE

GUNGAHLIN COLLEGE. Human Movement EXERCISE PHYSIOLOGY FATIGUE & RECOVERY. Fatigue. Fatigue can be defined simply as the inability to maintain a given level of physical performance .

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GUNGAHLIN COLLEGE

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  1. GUNGAHLIN COLLEGE Human Movement EXERCISE PHYSIOLOGY FATIGUE & RECOVERY

  2. Fatigue • Fatigue can be defined simply as the inability to maintain a given level of physical performance. • Most of us start the day fresh and full of energy, but by the end of our working day we feel tired and run down.

  3. Fatigue • The same can be said of physical performance – we simple slow down as it progresses. • In the same way that we all respond differently to training, fatigue affects people in varying ways.

  4. Fatigue • The effects of fatigue vary according to the • type of activity, • intensity of activity untaken, • current level of fitness of the performer. • mental state of the athlete

  5. 3 Classifications of Fatigue Local Fatigue • related to a specific activity or training session usually shows in a physiological way. It is commonly felt as soreness or pain in the muscles of the area that has been working, that is, it is localised.

  6. 3 Classifications of Fatigue General Fatigue • General fatigue related to the whole training session involves both physical and mental fatigue. This is the drained feeling usually felt at the end of a prolonged exercise bout.

  7. 3 Classifications of Fatigue Chronic Fatigue • Long term fatigue related to exhaustion. This is the most severe type of fatigue and causes a disruption to the functioning of the nervous system in addition to physiological and psychological stress.

  8. Fatigue • The cause of fatigue generally determines the type of recovery and is central to most training considerations. • If recovery between successive training sessions is inadequate, fatigue will accumulate and the adaptive training benefits will not become apparent.

  9. Fatigue • The result will be delayed adaptations (training effects), decreased performance and increased likelihood of injury and illness, due to the decreased efficiency of the body.

  10. Causes of Fatigue • Many factors have been isolated as possible contributors of fatigue. • Depletion of energy stores • Lactic acid accumulation • Increased body temperature • Dehydration • Fatigue may be indicated by the appearance of one of the following factors or a combination of them.

  11. Depletion of Energy Stores • As we begin to exercise, the most commonly exhausted energy stores are phosphocreatine and glycogen. • Both substances are stored at the muscles and depletion dramatically affects the production of ATP.

  12. Lactic Acid Accumulation • While participating in activities of short duration and high intensity, the body is unable to deliver sufficient oxygen to meet the demands of the activity. • This shortfall of oxygen causes the body to rely upon anaerobic glycolysis to supply energy anaerobically.

  13. Increase in Body Temperature • As we continue to exercise, our bodies start to ‘warm up’ and it is not uncommon for the core temperature of the body to rise during prolonged activity. • Once the body’s core temperature reaches 40 degrees, the body may lapse into unconsciousness as a protective reaction to stop damage occurring.

  14. Increase in Body Temperature (cont) • Vasodilation (vein expansion) occurs near the skin in an effort to cool it. Blood is shunted away from working muscles to the skin to increase the cooling effect. • This results in a decreased oxygen flow to working muscles and as such the performer must slow down.

  15. Dehydration • Loss of water and electrolytes = reduced blood volume and constricted blood flow • Reduces avalability of blood born fuels, o2 to the muscles and blood flow to the skin. • If blood flow to the skin is reduced heat cannot escape and body temp rises.

  16. Causes of Fatigue • This decrease in oxygen flow to working muscles may also contribute to the increased accumulation of lactic acid. • The increase in body temperature that results in a decrease in work performance is most commonly caused by the loss of body water encountered in endurance events.

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