The most complex revised physiological model proposed Nakes (2002) as a Central Governor Model.
Every of these models have wanted to supplement the initial model of Hill. Thanks to the new knowledge’s from this field of exercise physiology were made several new models from various points of view, e.g Neuromuscular fatigue model, Muscle trauma model, Biomechanical model, Thermoregulatory model, etc. Most adherents to this model use the terms of VO 2max, lactate threshold, and running economy when discussing aerobic or endurance training or physiology. The cause of fatigue is primarily in cardiorespiratory system and utilization of oxygen. This model basically posits that a lack of oxygen in working muscles is what ultimately limits exercise performance. The most recognized model of endurance abilities physiology is the Cardiovascular/Anaerobic model, initially suggested by British physiologists A.V. Also recovery rates are highly related to quality of endurance abilities and faster recovery allows the athlete to shorten rest intervals within and between training sessions and increase overall training load.
Many scientific works proved that aerobic endurance may last for a longer time before fatique appears and that it can last even in the state of fatique. Exercies used are usually locomotions or repeated cyclic movements. Aerobic metabolism prevails during physical exercise which is longer than than 2-3 minutes at a low, middle or submaximal intensity load. Endurance sports are activities which are performed during longer time interval and which prevailingly use aerobic metabolism involvement.
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