Heart rate variability after bariatric surgery: The add-on value of exercise

Area of Science:

• Cardiology
• Metabolic Surgery
• Exercise Physiology

Background:

• Severe obesity is linked to autonomic dysfunction, often reflected in altered heart rate variability (HRV).
• Bariatric surgery is a primary intervention for severe obesity, with potential impacts on cardiovascular health.
• Understanding the role of post-operative exercise in modulating HRV after bariatric surgery is crucial for optimizing patient outcomes.

Purpose of the Study:

• To evaluate the effect of bariatric surgery on heart rate variability (HRV).
• To determine if a supervised exercise training program provides additional benefits to HRV post-bariatric surgery.

Main Methods:

• Fifty-nine patients undergoing bariatric surgery were randomized into a 12-week supervised exercise program or a control group.
• Heart rate variability (HRV) indices, including time-domain, spectral-domain, and nonlinear parameters, were measured preoperatively and at 3, 6, and 12 months post-surgery.
• Anthropometric parameters, comorbidities (Type 2 diabetes, hypertension, dyslipidemia), and total body weight loss were also assessed.

Main Results:

• Bariatric surgery led to significant improvements in HRV parameters (SDNN, LF, HF) at 12 months compared to pre-operative values in both groups.
• Total body weight loss and resolution of comorbidities were comparable between the exercise intervention and control groups.
• No significant additional benefit on HRV parameters was observed in the supervised exercise group compared to the control group at 12 months post-surgery.

Conclusions:

• Bariatric surgery positively impacts heart rate variability (HRV) in patients with severe obesity.
• A supervised post-operative exercise training program does not appear to offer further HRV benefits beyond those achieved by bariatric surgery alone.