不同体能的健康女性对下体负压的心血管反应

Cardiovascular Responses to Lower Body Negative Pressure(LBNP) in Healthy Females of Different Physical Fitness.

目的探讨不同体能健康女性对下体负压（lower body negative pressure，LBNP）的反应特点。方法1）用运动平板测最大耗氧量；2）采用逐渐递增负压的方法，最大负压-50mmHg。被试者为21名30岁年龄组女性健康志愿者，分为惯于久坐的女职业组（A组：Vo2 max33．69±4．50mL·kg^-1·min^-1）11人，经常锻炼的女飞行组（B组：Vo2 max39．61±3.84mL·kg^-1·min^-1）10人。结果两组HR均随LBNP的负荷增加而增加（P〈0．01～0．001）。B组SBP明显降低（P〈0．01）。A组DBP明显增高（P〈0．05）。B组MBP显著降低（P〈0．05）。结论与女职业组相比，女飞行组对LBNP心血管反应不良，表明体能对LBNP有影响。

Objective To compare responses of tolerance to LBNP in different fitness of healthy women. Methods 1 ） Vo2max was examined with treadmill;2） A step-wise LBNP procedure to the maximum of -50 mmHg was applied. Twenty one healthy female volunteers were divided into group A, sitting employees （n =11,Vo2 max33.69±4.50mL·kg^-1·min^-1）） and group B, pilots （n = 10,Vo2 max39.61±3.84mL·kg^-1·min^-1）] ） . Results With the step-wise of LBNP heart rate of all groups were gradually increased. Under -50 mmHg, HR increased significantly （P 〈 0. 01 - 0. 001 ）, SBP of group B decreased significantly （P 〈0.01 ）, DBP of group A increased significantly （P 〈0.05） and MBP of group B decreased significantly （P 〈0.05）. Conclusion It is indicated that group of better fitness have lower cardiovascular responses to LBNP.