The anaerobic threshold.
D000693:Anaerobiosis; D002245:Carbon Dioxide; D004734:Energy Metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007773:Lactates / Q000097:blood / Q000378:metabolism*; D007811:Lanthanum / Q000097:blood; D008176:Lung Volume Measurements; D009132:Muscles / Q000378:metabolism*; D010101:Oxygen Consumption; D005082:Physical Exertion; D012119:Respiration; D013178:Sports Medicine
D007773:Lactates; D002245:Carbon Dioxide; D007811:Lanthanum