Cardiac autonomic response after cranial technique of the fourth ventricle (cv4) compression in systemic hypertensive...

Area of Science:

• Osteopathic manipulative medicine
• Cardiovascular physiology
• Autonomic nervous system function

Background:

• Hypertension (Stage I) and normotension present distinct cardiovascular profiles.
• The cranial technique of the 4th ventricle compression (CV4) is an osteopathic manipulative method.
• Understanding the impact of osteopathic techniques on autonomic balance is crucial for clinical applications.

Purpose of the Study:

• To compare blood pressure (BP) and heart rate variability (HRV) in hypertensive and normotensive individuals undergoing the CV4 technique.
• To investigate the effects of the CV4 maneuver on autonomic nervous system activity.

Main Methods:

• An experimental controlled study involving 30 men (40-60 years old) divided into normotensive (NT) and hypertensive (HT) groups.
• BP and RR intervals were measured at multiple time points (pre-intervention, post-intervention, 5, 10, 15 min) following the CV4 maneuver.
• Time-frequency HRV parameters (SDNN, RNSSD, LF, HF) were analyzed using two-way ANOVA.

Main Results:

• A significant reduction in BP was observed in the hypertensive group post-CV4.
• Heart rate variability analysis revealed significant intergroup differences in SDNN and RNSSD values between pre-intervention and post-intervention stages.
• Both groups exhibited increased high-frequency (HF) power and decreased low-frequency (LF) power, indicating enhanced parasympathetic and reduced sympathetic activity.

Conclusions:

• The CV4 technique demonstrated a blood pressure-lowering effect in hypertensive individuals.
• The study suggests a shift towards increased parasympathetic and decreased sympathetic activity in both groups, implying an altered sympathetic-vagal balance.
• Further research is warranted to fully elucidate the mechanisms behind the BP-reducing effects of the CV4 technique.