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Completed

NCT Number: NCT06531954

Breathing Exercises and Auricular Vagus Nerve Stimulation

Introduction: Vagal modulation is achieved directly by transcutaneous auricular vagus nerve stimulation, whereas breathing exercises stimulate arterial baroreceptors. In this study, we aimed to compare these two methods, which have similar effects.

Methods: 88 healthy participants aged 18-35 were randomly divided into breathing exercises (Group BE) and vagus stimulation (Group VNS). Thoracic expansion exercise was performed in the BE group. In the VNS group, biphasic electrical stimulation was applied to both ears with a pulse width of 300 microseconds, frequency of 10 Hz, and 20 minutes. Pulmonary function tests were measured on the first and last day. Heart rate, systolic and diastolic blood pressure, RMSSD, PNN50, LF/HF, LF Power, and HF Power values were measured before and after each of the ten sessions for both groups.

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Key information

Conditions

Breathing Exercises Auricular Vagus Nerve Stimulation Autonomic Nervous System

Age range

18 year–35 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Mudanya University

Bursa, 16160, Turkey (Türkiye)

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy individuals between the ages of 18 and 35,
  • without orthopedic disability,
  • without any chronic disease and regular medication use,
  • who had not smoked for the last year,
  • who had no problems in reading, writing, or comprehension were included in our study.

Exclusion criteria

  • active or chronic respiratory diseases and communication problems because they may adversely affect pulmonary function testing

Treatment and study plan

vagus nerve stimulation

Device

Vagus nerve stimulation group: Vagus stimulation was applied bilaterally through the ear. taVNS was performed with the Vagustim device. The stimulation pulse width was 300 microseconds, the frequency was 10 Hz, and it was biphasic with a 20-minute duration. Electrodes were placed on the concha and tragus parts of the ear, and the current was increased through these electrodes until the participant felt pain.

BREATHING EXERCISE

Behavioral

Breathing exercise group: The content of breathing exercises was planned as thoracic expansion exercises. These exercises were applied to the lower, middle, and upper lobes in 3 sets of 3x10 (90 times breathing in one area) and lasted for an average of 20 minutes. Participants were asked to inhale as deeply as possible into the relevant area, hold their breath for 3 seconds, and then slowly exhale the entire breath.

Primary outcomes

  1. Autonomic nervous system activity

    Time frame: pre-intervention, immediately after-intervention

    Autonomic measurements of each individual participating in the study before and after the intervention were performed with heart rate variability parameters. For this purpose, the Elite HRV device was used. The device has a finger sensor and an application compatible with the phone. Elite HRV application is a software that can synchronize with a personal monitor by collecting peak-to-peak intervals for instant analysis of pulse rate variability (PRV). In addition to all these assessments, blood pressure measurements of the participants were also evaluated using an Omron M2 electronic sphygmomanometer on the right arm.

  2. Pulmonary Function. Forced expiratory volume in the first second (FEV1)

    Time frame: pre-intervention, immediately after-intervention

    Participants in both groups underwent pulmonary function test evaluation on the first and last day. Since the study was conducted in healthy individuals, it was deemed appropriate to look at the pulmonary function test before and after exertion to see possible changes. Medwelt SP10 spirometer was used for pulmonary function tests in our study. Each individual was measured in a sitting position using a separate mouthpiece.

  3. Pulmonary Function. Forced vital capacity (FVC)

    Time frame: pre-intervention, immediately after-intervention

    Participants in both groups underwent pulmonary function test evaluation on the first and last day. Since the study was conducted in healthy individuals, it was deemed appropriate to look at the pulmonary function test before and after exertion to see possible changes. Medwelt SP10 spirometer was used for pulmonary function tests in our study. Each individual was measured in a sitting position using a separate mouthpiece.

Sponsors and collaborators

Lead sponsor

Istanbul Medipol University Hospital

Other

Registry information

Official study title

Comparison Of Breathing Exercises and Auricular Vagus Nerve Stimulation Effects On Autonomic Nervous System Activity and Respiratory Functions In Healthy Adults

Important dates

Study start
2021
Primary completion
2022
Study completion
2023
First posted
Aug 1, 2024
Registry last updated
Aug 1, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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