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

Are Muscle Fibre Types Genetically Determined Or Determined By Training?

Extracts from this document...


Are Muscle Fibre Types Genetically Determined Or Determined By Training? The type of muscle fibres an athlete possesses will prove to be a limiting, or promoting factor in the sport an athlete chooses to participate in. There are two main types of muscle fibre, slow twitch and fast twitch. Slow twitch fibres enable an athlete to perform under aerobic conditions whilst fast twitch fibres enable an athlete to perform under anaerobic conditions. Therefore the percentage an athlete possesses of each can be a predictor of how well an athlete will do in a given sport. The percentage of each type of fibre an athlete possesses is genetically determined. That is it is inherent from parents and other ancestors. This could be shown by a muscle biopsy taken, for example (although not practical in real life), at birth and then again at a later stage in the athletes life. The percentage of muscle fibre types would still be the same. ...read more.


They have a greater resistance to fatigue and higher aerobic capacity than type IIb. These muscle fibres can be utilised through training to give an enhanced performance. They can be changed through training. Although this does not change the percentage of genetically determined muscle fibre types in the body, it does show that training plays a part in our muscle fibre make up, and also shows that a person with high percentage of fast twitch fibres could still compete in a marathon against athletes with higher percentages of slow twitch fibres. Training is obviously an important factor to consider. Training causes changes to the body as a whole. For endurance training one of the main adaptations is increased VO2 max. This means more oxygen can reach the muscles and so they can work harder and longer. Endurance training also increases the number of capillaries around type I muscle fibres meaning they can get more oxygen to them. ...read more.


After looking at both sides of the argument it is clear to see that neither is completely right. Our fibre types are indeed determined genetically and we will be stuck with what we were born with but it is not the only factor that needs to be considered. It has been shown here that through training of either type of muscle fibre it is possible to exploit our existing fibres to a better degree and that also with motivation to do well our genetically determined fibre types do not have to be a limiting factor. Unfortunately, so far, there has not been any 100% conclusive scientific evidence that can prove that muscle fibres do or do not change with training, as studies have not been conducted over long enough time periods. It is appropriate to say that the evidence so far shows that type I cannot be changed but type IIa can modify to being like type IIb and also more like type I fibres. Thus meaning we can always train to be what we wish to be. Elliott Owen: N0036961 Word Count: 841 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our University Degree Sports Science 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 University Degree Sports Science essays

  1. Oxygen Uptake and VO2 Consumption When Training

    that the rate of heat accumulation by the body is increased and fatigue, or an inability to exercise voluntary, occurs sooner than when exercising in cool conditions (Werner, 1993). Rowell (1974) cited in Febbraio (2001) found a reduction in O2, substrate delivery and utilisation because of reduced muscle blood flow during exercise in the heat.

  2. Sport psychology is practiced by psychologists specializing in the domain of sport psychology and ...

    demand that he is in control as there is a lot of pressure. PERSONALITY QUESTIONNAIRE Simon's personality test graph shows that he is either got a really good result or a really bad result. It shows that he is extremely aggressive, happy, composed, certain and active, on the other hand

  1. Free essay

    Psychological Skills Training Of A Competing Athlete

    An interview is a good source of data collection because they can identify possible areas for more detailed analysis, which would not be identified in a questionnaire. They can be modified as necessary, providing the subject's personal words and views, providing a deepened understanding (Patton, 1990).

  2. Sport industry.The sport industry is important to many people whop work in it and ...

    they also put football on most of the time, Football is on most of the time at night. The Olympics only comes on the television once every four years so they don't get much coverage. People watch the Olympics when it comes on but football is on a lot more than the Olympics.

  1. Physiology of exercise and training.

    The client should reduce their intake of beer/ soft drinks, an increase the amount of water they consume. The recommended amount of water for an adult to consume is between 1.5 liters and 2 liters daily (Egger, Champion, Bolton 1999).

  2. Anabolic steroids sometimes referred to as roids or juice is synthetic hormones that cause ...

    Steroids can be taken in the form of pills, powders, or injections, the way in which it is used is by cycles of weeks or months referred to as "cycling", rather than continuously. Cycling involves taking multiple doses of steroids over a certain period of time (8 to 10 weeks)

  1. Physiological Adaptations to Exercise

    Since this system is short-lived and lactic acid levels rise, the intensity can not be sustained and the athlete will need to decrease intensity to remove lactic acid build-up Dick F. (2002). The following table provides an approximation of the percentage contribution of the energy pathways in certain sports, Fox et al.

  2. Research Proposal - how diet and dietary supplements affect muscle growth.

    will consume the recommended usage; five grams of BCAAâs, three times a day. This will split up into one portion as soon as the participants wake up, one directly after a training session on a training day or in the afternoon on a non-training day, and one in the evening before the participants go to sleep.

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