反复体位改变训练对人体立位耐力的影响

Effects of Repeated Body Position Change Training for Human Orthostatic Tolerance.

目的验证反复体位改变训练提高人体立位耐力的有效性 ,并探讨其机理。方法 6名被试者经受了为期 1 1d共 9次的反复体位改变训练。在训练前和训练后利用头高位倾斜检查立位耐力。结果训练后 ,被试者在立位耐力检查中的反应得到改善 ,表现为与训练前相比立位中不良症状明显减轻 (症状得分 4.5 0± 1 .0 5vs .2 .83± 1 .60 ,P <0 .0 5 ) ,心率的增量明显降低 [( 2 9.3± 4.3)bpmvs .( 1 3.5± 7.5 )bpm ,P <0 .0 1 ],平均动脉压的增量明显增加 [( 4 .8± 4.4)mmHgvs.( 9.0± 3.0 )mmHg ,P <0 .0 5 ],心血管反应指数明显减小 ( 34.42± 5 .0 0vs.2 2 .33± 8.2 7,P <0 .0 1 )。结论反复体位改变训练可提高人体立位耐力。该训练有望在飞行员 。

Objective To verify the validity that repeated position change training can increase human orthosta tic tolerance and to explore its mechanism. Method Six subjects were trained with repeated position change for 11 d according to a protocol of alternative head down and head up tilts, each set of training lasted for about 35 min. Their orthostatic tolerances were determined before and after training. Result Compared with the data before training, subjects′ symptom scores during orthostatic tolerance test after training decreased significantly (4.50±1.05 vs.2.83±1.60,P<0.05), magnitude of the increased heart rate increase lowered significantly [(29.3±4.3) bpm vs.(13.5±7.5) bpm,P<0.01], magnitude of mean arterial blood pressure augmentation increased significantly[(4.8±4.4)mmHg vs.(9.0±3.0)mmHg,P<0.05] and cardiovascular response index decreased significantly(34.42±5.00 vs.22.33±8.27,P<0.01). In brief, the responses to orthostatic stress were improved after training. Conclusion Repeated alternative body position change training can increase human orthostatic tolerance. This kind of training is promising for pilot, especially astronaut training.