The following gene polymorphisms were determined in genomic DNA : angiotensin-converting enzyme insertion/deletion polymorphism ( I/D ACE ) , angiotensinogen gene polymorphism ( M 235 ) , angiotensin II receptor type 1 ( ATR1 ) polymorphism ( A 11666C ) , and polymorphism of serotonin transporter gene ( 5HTTLPR ) .Heart rate variability during HUT was assessed in 5-minute intervals by low frequency , high frequency , standard deviation of the normal-to-normal ( SDNN ) , and root mean square successive difference parameters .
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