Williams, J R The 4 mM blood lactate level as an index of exercise performance in 11-13 year old children. [electronic resource] - Journal of sports sciences 1990 - 139-47 p. digital Publication Type: Journal Article ISSN: 0264-0414 Standard No.: 10.1080/02640419008732140 doi Subjects--Topical Terms: AdolescentAnaerobic Threshold--physiologyChildEfficiency--physiologyExercise--physiologyFemaleHumansLactates--bloodMaleOxygen Consumption--physiology