卧床对心血管反应特征影响的观察

用立位加下身负压作为负荷,被试者心血管反应可分成四种不同特征,即血管型、混合型、心脏型和欠调型。它们主要特征分别表现为:血管型以增加外周阻力为主;混合型心率和外周阻力都明显增加;心脏型心率增加非常明显;欠调型心率和外周阻力都调节不上去。负荷耐力以血管型最佳,混合型第二,心脏璎第三,欠调型较差。在卧床期间,被试者主观感觉和客观检查也表现为血管型和混合型较其它两种反应类型为好。卧床前后负荷试验的反应特征基本相似。用模糊数学的概念处理这些数据,可以定量地比较出心血管反应特征的差异。 

THE OBSERVATION OF INFLUENCE ON THE CHARACTERISTICS OF CARDIOVASCULAR RESPONSE DURING BED REST

During the stress of head up tilt plus lower body negative pressure,the subjects' cardiovascular responses might be divided into four characteristics: vascular type,mixed type,cardiac type and less regulating (lower efficient) type.The regulating characteristics of vascular type mainly showed an increase of total peripheral resistance during stress.The mixed type had an obvious increase of both heart rate and total peripheral resistence.The cardiac type appeared obvious in the increase of heart rate.The less regulating type couldn't be sufficiently regulated in both heart rate and total peripheral resistance.The subjects of vascular type was showed the best tolerance of the stress,then those of the mixed,and then those of the cardiac.The subject of less regulating type showed the worst tolerance.During bed rest,the subjects' feeling and the objective examinations also showed the vascular and the mixed types were better than the other two types.Before and after bed rest,the characteristics of reaction to this stress were similar intraindivi-dually.Data might be treated with the concept of fuzzy sets.The difference among different characteristics of cardiovascular reactions might be quantitatively compared.