CAJ | 학술논문

目的了解立位-下体负压（HUT＋LBNP）期间心血管系统的变化，确定心律变异和脉图两种方法在评价心血管调节功能中的作用。方法观察16名被试者在75°头高位倾斜加-4 kPa下体负压20 min期间血压、脉图、心律变异和脑血氧饱和度的变化。结果 (1) HUT＋LBNP可引起被试者出现明显的心率、血压、规-化低频峰功率(LFn)、LFn/HFn增加，脑血氧饱和度、心电T波和规-化高频峰功率(HFn)下降；(2) 晕厥前出现明显的血压、心率和脑血氧饱和度下降；(3) 低耐力组在HUT＋LBNP初期的心率明显高于高耐力组；(4) HUT＋LBNP时脉搏波波形发生很大变化，无法进行分析。结论 HUT+LBNP是一种负荷量较高的立位耐力检查方法，可充分暴露被检者在立位中的心血管调节功能；脉图检测方法不能作为评价被试者HUT+LBNP耐力的方法
목적 료해립위-하체부압（HUT＋LBNP）기간심혈관계통적변화，학정심률변이화맥도량충방법재평개심혈관조절공능중적작용。 방법 관찰16명피시자재75°두고위경사가-4 kPa하체부압20 min기간혈압、맥도、심률변이화뇌혈양포화도적변화。결과 (1) HUT＋LBNP가인기피시자출현명현적심솔、혈압、규-화저빈봉공솔(LFn)、LFn/HFn증가，뇌혈양포화도、심전T파화규-화고빈봉공솔(HFn)하강；(2) 훈궐전출현명현적혈압、심솔화뇌혈양포화도하강；(3) 저내력조재HUT＋LBNP초기적심솔명현고우고내력조；(4) HUT＋LBNP시맥박파파형발생흔대변화，무법진행분석。 결론 HUT+LBNP시일충부하량교고적립위내력검사방법，가충분폭로피검자재립위중적심혈관조절공능；맥도검측방법불능작위평개피시자HUT+LBNP내력적방법
Objective To understand the change of the cardiovascular function and to evaluate the usefulness of sphygmography and heart rate variability (HRV) spectrum techniques on estimating cardiovascular function during HUP+LBNP. Method Blood pressure, ECG, cerebral oxygen saturation and sphygmogram of 16 subjects were studied during 75° head up tilt plus lower body negative pressure (HUP+LBNP). Result (1) During HUP+LBNP, heart rate, blood pressure, normalized low frequcncy component(LFn), LFn/HFn increased significantly, the cerebral blood oxygen saturation, T wave (ECG), HFn decreased significantly；(2) Blood pressure, heart rate and cerebral blood oxygen saturation decreased significantly in presyncopal state；(3)The heart rate in low tolerance group was higher than that in high tolerance group during the initial stage of HUT+LBNP;(4) The shape of pulse wave changed enormously during HUP+LBNP,so that no analysis could be made. Conclusion HUP+LBNP was an effective approach to examine the regulatory function of cardiovascular system,and the sphygmogram could not be used in studying the regulatory function of cardiovascular system during HUP+LBNP.