Reduced heart rate variability correlates with insulin resistance but not with measures of obesity in population undergoing laparoscopic Roux-en-Y gastric bypass

HRV in the severely obese is better predicted by the degree of insulin resistance, than by the degree of obesity, age, or gender. GB led to an improvement in HRV, the magnitude of which correlated with the change in insulin resistance and glucose disposition index, but not with weight loss.