After four weeks the model group were divided into the model control group (B1), TMP treatment group (B2), swimming training group (B3) and swimming training with TMP treatment group (B4).

• 4周后慢性低氧模型组又随机分为对照组(B1)、川芎嗪治疗组(B2)、单独游泳组(B3)和川芎嗪治疗+游泳锻炼组(B4)。