This document discusses the anaerobic threshold and factors that influence threshold training. The anaerobic threshold is defined as the point at which lactic acid starts to accumulate in the muscles, around 85-90% of maximum heart rate. Anaerobic threshold testing involves gradually increasing effort over a 20-30 minute run, swim, or bike while monitoring heart rate to identify the threshold point where heart rate levels off. Factors like VO2 max, muscle fiber type, and lactate removal ability influence an individual's threshold. The threshold can be measured during a 30 minute long distance run using heart rate monitoring equipment.

1. Anaerobic Threshold
K.Soundararajan
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2. Objectives
• Glycolysis
• Cori’s cycle
• Anaerobic Threshold
• Anaerobic Threshold Testing
• Factors Influencing Threshold Training
• OBLA
• Reference
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3. Cori’s Cycle
Anaerobic / Lactate
Threshold
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4. Anaerobic Threshold
• The anaerobic threshold (AT) or lactic threshold
(LT), the point at which lactic acid starts to
accumulates in the muscles, is considered to be
somewhere between 85% and 90% of
your maximum heart rate (HRmax).
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5. Anaerobic Threshold Testing
• An anaerobic threshold (AT) or lactic threshold
heart rate (LTHR) test general comprises of
conducting an activity (running, cycling,
swimming) for a period of 20 to 30 minutes
• whilst gradually increasing the effort at set
points (distance or time), recording the heart rate
a these points, until you are unable to continue
with the activity.
• The recorded heart rates are then plotted on a
graph and you will find the graph gradually rises
to start with and then flattens before rising again.
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7. Factors Influencing Threshold Training
1. VO2 MAX-?
The higher the vo2 max of an athlete the higher his threshold can be
developed.
2. Muscle fibre type-Those athletes who have higher percentages of
slow twitch fibres are able to exercise at higher intensities without
much accumulation of metabolites.
3.Lactate /Metabolic waste removal ability-
• With training the athletes can stimulate lactate clearance from the
blood &use it as an additional source of energy for the muscles.
• THE INDIVIUAL ANAEROBIC THRESHOLD CAN BE MEASURED UNDER
THE FOLLOWING PARAMETERS-can be done on an ergometer or
any other apparatus (to measure hr) , min 30 min long distance
running.
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8. OBLA
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9. Reference
1. DM VASUDEVAN et al.(2011) Carbohydrates –II ,Text book of Bio-
chemistry for dental students, 5, pp.42-52
2. CONCONI, F. et al. (1982) Determination of the anaerobic threshold by a
non-invasive field test in runners. Journal of Applied Physiology, 52, p.
869-873
3. JONES, A. and DOUST, J. (1995) Lack of reliability in Conconi's heart rate
deflection point. International Journal of Sports Medicine, 16, p. 541-544
4. DAVIS, J.A. et al. (1979) Anaerobic threshold alterations caused by
endurance training in middle-aged men. Journal of Applied
Physiology, 46(6), pp.1039-1046.
5. DAVIS, J. A. et al. (1979) Anaerobic threshold alterations caused by
endurance training in middle-aged men. Journal of applied physiology:
respiratory, environmental and exercise physiology, 46 (6), p. 1039-1046
6. YEH, M. P. et al. (1983) Anaerobic threshold' - Problems of determination
and validation. Journal of applied physiology: respiratory, environmental
and exercise physiology, 55, p. 1178-1186
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