Hormonal
Six months of caloric restriction combined with aerobic exercise significantly improves autonomic nervous system balance (decreased sympathetic, increased parasympathetic activity) in overweight individuals, whereas caloric restriction alone does not achieve statistical significance.
If you are overweight and want to improve your heart's stress regulation (autonomic balance), combining a moderate calorie reduction with regular aerobic exercise is more effective than dieting alone. Aim for a combined 25% energy deficit, split between what you eat and how much you move, sustained over six months.
HR and SNS index decreased and PNS index increased in all intervention groups but reached significance only in CREX... The results therefore suggest that weight loss improved SNS/PNS balance especially when CR is combined with exercise.
Why this rating
Randomized controlled trial with a small sample size (n=28) and short duration (6 months), but with rigorous measurement of HRV.
Source
Impact of 6‐month Caloric Restriction on Autonomic Nervous System Activity in Healthy, Overweight, Individuals
Lilian de Jonge et al. · Obesity · 2009
DOI 10.1038/oby.2009.408
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