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Onset of Blood Lactate Accumulation

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Onset of Blood Lactate Accumulation Introduction: The aim of the practical was to carry out an exercise to be able to calculate the individuals Lactate threshold and Onset of Blood Lactate Accumulation. It is consider that the level of lactate threshold is a good indication of the athletes potential for endurance exercise. It is important not to confuse lactate threshold and onset of blood lactate threshold, as there is a clear difference. The Lactate threshold is as Jones (1997) describes the exercise intensity for which the start of lactate begins to accumulate rapidly in the blood. Wilmore and Costill (1999), mention that it tends to happen above resting levels during increased intensity of exercise. Although the lactate threshold is not always clear, therefore a 'Breaking Point' is used named Onset of Blood Lactate Accumulation (OBLA), claims Astrand and Rodahl (1986). The standard point of reference for the arbitrary value is either 2 or 4 mmols, pointed out by Sj�din and Jacobs (1981). Mader (1976) suggested that predominately 4 mmols lactate per litre of blood would be taken as the arbitrary value in correspondence to anaerobic threshold, OBLA. During this experiment the arbitrary value was 2.5 mmols/L. ...read more.


The sample entered the PGM7 analox to analyse the concentration of lactate in the blood. The results were displayed as tables and graphs. Discussion: The purpose of the study was to compare the lactate accumulation between two sports science students. The results showed that subject 1 reach their lactate threshold after 20 minutes into the practical at a speed of 13.7 km/h. the level of lactate was 2.3 mmols/L, which rapidly accumulated 3.6 mmols/L. Subject 2 continued running for 16 minutes until a distinct increase was apparent to represent the lactate threshold at a speed 13.7 km/h. Subject 2 was able to continue performing through high levels of lactate. This indicates that the subject has high tolerance to lactate in the blood and the capability to efficiently abolish the lactate to impede the accumulation. Richardson and Hardman (1989) claimed to obtain high intensity of exercise prior to lactate threshold tends to favour an athlete with the greatest endurance. Therefore subject 1 is the better suited for endurance events. Subject 1 has low lactate threshold and is able to exercise for longer, which is good as McArdle, Knatch, Knatch (1994) ...read more.


Subject 2 had been running for 16 minutes with 4 intervals. The results suggest that subject 1 would show great attributes towards endurance exercise as lactate was low therefore able to continue for an immense period at a rapid pace. Reference List: > Astrand, P.O., and Rodahl.K. (1986). Textbook of work physiology. Singapore: McGraw-Hill. pp 327 > Jones, A. (1995). Heart rate, lactate threshold and endurance training. Coaching Focus. Vol 33 pp 12-13 > Lamb, D.R. (1984). Physiology of Exercise. New York: Macmillan. pp 139-154. > McArdle., Knatch & Knatch. (1994). Essentails of Exercise Physiology. United States of America: Williams & Watkins. > Richardson, S. & Hardman, A. E (1989), Endurance Fitness & Blood Lactate Concentration During stepping Exercise In Untrained subjects, British Journal of Sport Medicine., Vol 23, No.3. > Sj�din, B and Jacobs, I. (1981). Onset of blood lactate accumulation and marathon running performance. International Journal of Sports Medicine. Vol 22. pp 23-26 > Tesch P., Sj�din B., Karlsson. (1978): Relationship between lactate accumulation, LDH activity, LDH isoenzyme and fibre type distribution in human skeletal muscle. International Journal of Sports Medicine Vol 14. pp 40-46 > Weltman, A, (1995). The blood lactate response to exercise. (Human Kinetics Monograph 4). Leeds: Human kinetics. pp 2-5 > Wilmore, J,. Costill, D (1999) Physiology of Sport and Exercise United States of America: Human Kinetics. pp 136-137. . ...read more.

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