The Effect of Low Frequency Sound on Heart Rate Variability and Subjective Perception: A Randomized Crossover Study

Area of Science:

• Physiology
• Psychology
• Acoustic Therapy

Background:

• Vibroacoustic therapy (VAT) utilizes low-frequency sound for therapeutic benefits.
• The specific physiological and perceptual impacts of low-frequency vibration (LFV) remain largely uninvestigated.

Purpose of the Study:

• To compare the effects of constant 40 Hz LFV, amplitude-modulated LFV, and placebo on physiological and psychological measures.
• To assess the impact of LFV on heart rate variability (HRV), stress perception, and mood.

Main Methods:

• A randomized cross-over study design was employed.
• Participants were exposed to constant LFV (40 Hz), amplitude-modulated LFV, and a placebo condition.
• Heart rate variability (HRV), stress perception (VAS), and mood (UWIST) were measured.

Main Results:

• Interventions demonstrated some effects on HRV, stress perception, and mood.
• Differences between LFV interventions and placebo were infrequent and generally not statistically significant.
• Observed effects may be influenced by factors beyond LFV itself.

Conclusions:

• Preliminary findings suggest LFV may influence physiological and psychological states, but require verification through large-scale studies.
• Further research is needed to explore confounding factors, such as autonomic nervous system type.
• The potential synergistic effect of LFV combined with music warrants investigation.