title: The significance of the aerobic-anaerobic transition for the determination of work load intensities during endurance training.
abstract: Anaerobic and aerobic-anaerobic threshold (4 mmol/l lactate), as well as maximal capacity, were determined in seven cross country skiers of national level. All of them ran in a treadmill exercise for at least 30 min at constant heart rates as well as at constant running speed, both as previously determined for the aerobic-anaerobic threshold. During the exercise performed with a constant speed, lactate concentration initially rose to values of nearly 4 mmol/l and then remained essentially constant during the rest of the exercise. Heart rate displayed a slight but permanent increase and was on the average above 170 beats/min. A new arrangement of concepts for the anaerobic and aerobic-anaerobic threshold (as derived from energy metabolism) is suggested, that will make possible the determination of optimal work load intensities during endurance training by regulating heart rate.
mesh_terms: D000328:Adult; D006321:Heart / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood; D010101:Oxygen Consumption; D010806:Physical Education and Training; D010807:Physical Endurance; D005082:Physical Exertion; D013178:Sports Medicine
chemical_list: D007773:Lactates