Head Massage Therapy More Efficacious Than Mechanical Helmet Massager to Stimulate Parasympathetic Cardiac Tone: A Randomized Cross-Over Trial

HMT shows a stronger effect on the parasympathetic nervous system as expressed by increase in HFnu with decrease in HR, diastolic blood pressure and body tension, compared with RR and also MHM. More studies are needed to understand how different relaxing interventions may modulate the autonomic nervous system