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Table 1 The study population demographic characteristics and summaries of HRV indices.

From: Insulin resistance and circadian rhythm of cardiac autonomic modulation

Demographics All subjects (n = 94)
Age (years) 56.5 (7.8)
Gender (% male) 37.2
Race (% white) 76.6
BMI (kg/m2) 27.1 (4.9)
College or higher (%) 78.2
Cardiovascular disease (%) 7.4
Hypertension (%) 33.0
Systolic BP (mmHg) 122.0 (15.4)
Diastolic BP (mmHg) 75.0 (9.3)
Insulin (μU/mL) 6.6 (6.7)
Log insulin (μU/mL) 1.5 (0.8)
Glucose (mg/dL) 84.4 (11.3)
HOMA-IR 1.45 (1.73)
Log HOMA-IR -0.030 (0.86)
HRV indices*:  
   Log of HF (ms2) 4.4 (0.9)
   Log of LF (ms2) 5.4 (0.8)
   LF/HF ratio 3.8 (2.2)
   Log of VLF (ms2) 6.9 (0.6)
   SDNN (ms) 61.8 (18.4)
   RMSSD (ms) 29.6 (14.8)
   Heart rate (BPM) 76.5 (9.7)
  1. Abbreviations: BMI, body mass index; BP, blood pressure; BPM, beats per minute; HF, high frequency power; HOMA-IR, homeostasis model assessment of insulin resistance; HRV, heart rate variability; LF, low frequency power; Log, logarithm; RMSSD, square root of the mean of the sum of the squares of differences between adjacent RR intervals; SDNN, standard deviation of all RR intervals; VLF, very low frequency power.
  2. Data are expressed as mean (SD) or percentage.
  3. *: Overall average of the intra-subject means.