Effects on blood pressure associated with heart rate variability (HRV) and muscle sympathetic nerve activity (10×).

Multiple analysis adjusted for age, BMI and smoking;a: systolic blood pressure;b: diastolic blood pressure;c: men blood pressure;d: confidence interva;e: heart rate variability;f: standard deviation of normal RR intervals;g: root mean square of differences between NN adjacent intervals;h: high frequence;i: low frequence;j: Muscle sympathetic- nerve activity-bursts/100 Heart beats;k: maximum voluntary contraction at 30%.