目的 :探索 9～ 12岁少年游泳运动员血乳酸阈 (BLT)的特点 ,为科学化训练和教学提供依据 ,为少年游泳运动员生理机能和能量代谢的纵向研究提供参数。方法 :对 78名 9～ 12岁少年男、女游泳运动员进行池内递增负荷的动态血乳酸测试 ,观察其个体乳酸阈。结果 :9～ 12岁各年龄组游泳运动员的乳酸阈范围在 1 8～ 3 2mmol/L ,大多数集中在 2 5mmol/L左右。结论 :少年运动员乳酸阈偏低 ,个体差异明显。在运动实践中 ,应根据少年运动员个体乳酸阈特点 ,科学合理地安排训练强度。 Objective: To explore the characteristics of blood lactic acid threshold (BLT) in juvenile swimmers aged 9-12 years, and to provide a basis for scientific training and teaching to provide parameters for the longitudinal study of physiological function and energy metabolism of juvenile swimmers. Methods: Eighty - eight male and female swimmers aged from 9 to 12 were tested for dynamic lactic acid in increasing load in the pool, and the individual lactate threshold was observed. Results: The lactic acid threshold ranged from 18 to 32 mmol / L for swimmers of all ages from 9 to 12 years old, most of which concentrated in 25 mmol / L. Conclusion: The juvenile athletes lactic acid threshold is low, the individual difference is obvious. In sports practice, according to the characteristics of juvenile athletes lactic acid threshold, scientific and reasonable arrangements for training intensity.