• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Task 4 Mechanisms of Fatigue

Extracts from this document...


Exercise Physiology BTEC Sport and Exercise Science Project Task 4: Mechanisms of Fatigue In this assignment I will be listing the mechanisms of fatigue, including neuromuscular fatigue. I will be listing the role of metabolites, and identifying the role of oxygen and other factors in the recovery process. Neuromuscular fatigue Neural fatigue Neural fatigue means a disruption of neuromuscular events. Fatigue occurs because of a decrease in calcium production. A failure of acetylcholine generation reduces the chance of an action potential. The CNS (central nervous system) may identify fatigue prior to physiological fatigue. This stops you from doing anymore exercise to avoid you from injury, which could be muscle soreness. Muscular fatigue Muscle fatigue means a decrease of muscular performance. It is an inability to maintain the standard power output. Muscle fatigues when there is a depletion of PC stores e.g. sprinting. Therefore there is an accumulation of lactic acid and a decrease in pH. During endurance there is a depletion of energy stores, which are fat and carbohydrates. Carbon dioxide accumulation results in an increase in pH in the blood. ...read more.


If the exercise session was of a very high intensity then it will take longer to recover, however, the fitter you are the faster you will recover. The faster the debt can be repaid, the more quickly the performer can exercise again. The oxygen debt consists of two separate components: the alactacid debt and the lactacid debt. Alactacid oxygen debt is the process of recovery that does not involve lactic acid. The aerobic energy system is used to produce the ATP required to replenish the PC stores and ATP stores in the body: ADP + P + Oxygen --> ATP ATP + C + P --> PC + ADP Around 50% of the replenishment occurs during the first 30 seconds, while full recovery occurs at about three minutes. The alactacid oxygen debt ranges between 2 to 3.5 litres of oxygen. The fitter you are, the greater the debt because training increases the PC content within the muscle cells. However, the recovery time of a fitter person is reduced because they have enhanced methods of oxygen delivery such as increased capilliarisation and an improved cardio respiratory system, which will increase the rate of ATP production from the aerobic energy system. ...read more.


Excess post-exercise oxygen consumption (EPOC) Oxygen debt is occasionally called EPOC. EPOC refers to the total oxygen consumed after exercise in excess of a pre-exercise baseline level. EPOC occurs when a person exercises at high intensity, when oxygen cannot be supplied by the anaerobic energy systems, which results in lactic acid production. When the person stops exercising, extra oxygen is breathed in order to break down lactic acid to carbon dioxide and water, to replenish ATP, phosphocreatine and glycogen, and to pay back any oxygen that has been borrowed from haemoglobin and myoglobin. Training and its effect on fatigue Training has the effect of increasing the body's ability to exercise for longer without tiring. However, it is necessary to carry out specific training in order to ensure the body adapts to the type of exercise an athlete is competing in, i.e. a marathon runner would have to run persistently for long distances in order to adapt their body to increase the aerobic production of ATP. A sprinter, on the other hand, would have to train anaerobically in order to increase their tolerance to lactic acid and increase their PC stores. ?? ?? ?? ?? BTEC National Award in Sport & Exercise Science Priya Sethi Exercise Physiology Page 1 of 4 Task 4 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Anatomy and Physiology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Anatomy and Physiology essays

  1. Investigating the Short-Term Effects of Exercise on the Body.

    This is explained in the previous paragraph. Evaluation: Overall, the results obtained were fairly accurate in the experiment conducted. Inaccuracies with the conduction of the experiment may have been brought about by the following problems: * All measurements were gained using manually controlled equipment, which relies on the accuracy of

  2. Conduct the Queens Step test (provided) for all 4 students. Record the resting heart ...

    Aerobic fitness is being improved as stress but not fatigue is occurring while the cardiorespiratory system is becoming more efficient. 4. Backstroke: Medium intensity backstroke with varying number of laps of 100m each allows the aerobic system to come under stress, from intervals before without fatiguing.

  1. Personal Exercise Programme

    Lastly I managed to recover within three minutes and this is good as I have managed this by 7 weeks and I still have improvement left in me Evaluation week 8 - resting pulse rate = 80 seconds - pulse rate after one minute = 114 - pulse rate after

  2. Onset of Blood Lactate Accumulation

    Tesch (1978) identifies that it is beneficial for an athlete to work as close to their lactate threshold to gain maximum performance, although must not cross lactate threshold as will suffer from fatigue and muscle soreness. An important issue mentioned by Sj�din and Jacobs, is that the physiological build of a body

  1. Negative effects of exercise Exercise is also known for its vast results ...

    Third degree - total rupture of ligament, severe pain, severe swelling Haematomas This is bleeding in or around a muscle. If it is bleeding in the muscle then it's called an intramuscular haematoma. This type can lead up to a pressure build up within the muscle tissue as the blood is trapped within the muscle.

  2. Fatigue - affects on the body

    There is a decrease in the amount of cholinesterase, this results in a build up of ACH. Then overloaded-muscle fibres develop a higher threshold for the ACH so the body does not produce it when it needs just a little bit.

  1. Cardiovascular and Respiratory Responses to Submaximal Exercise under Aerobic Conditions

    Materials and Methods The laboratory protocol was followed exactly. Please see appendix A. 3. Results All testing was completed under conditions that were as carefully controlled as possible. The laboratory was not controlled with regard to temperature, although it remained constant through the experiment at 24 0 C.

  2. Mechanics of Breathing and responses to exercise

    Type II cells are smaller and thicker than type I and synthesis and secret surfactant. Surfactant allows expansion of the lungs to be easier as it mixes with the thin fluid lining. There are also white blood cells namely neutrophils which act as a third line of defence against bacteria or particle which reach the alveoli.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work