For any micro-cycle, target intensities and durations may be chosen on an individual basis. Four domains of duration with respect to induced fatigue can be derived from maximal duration obtained by the power-duration curve. Using percentages of the maximal duration allows regulating fatigue, recovery time, and adaptation for any single endurance training session. A maximal duration exists for any single power or velocity such as described in the power-duration relationship. The turn points define three zones of intensities with distinct acute metabolic, hormonal, and cardio-respiratory responses for endurance exercise. The concept is based on both the differentiation of intensities by two lactate or gas exchange variables derived turn points, and on the relationship between power (or velocity) and duration (or distance). Here we show the combination of exercise intensity and duration prescription on an individual basis applying the power/speed to distance/time relationship. An according recent approach was the critical power concept which seems to have a physiological basis however, the mathematical approach of this concept does not allow applying the three zones/two threshold model of metabolism and its different physiological consequences. As the specific exercise duration for any intensity plays a substantial role regarding the different kind of cellular stressors, degree, and kind of fatigue as well as training effects, concepts integrating the prescription of both intensity and duration within one model are needed. Exercise duration, another important variable of training load, is rarely prescribed by individual measures and mostly set from experience. The regulation of endurance training is usually based on the prescription of exercise intensity.
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