{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Heart+Rate+Variability",
    "query": {
      "condition": "Heart Rate Variability"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 192,
    "total_pages": 20,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Heart+Rate+Variability&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-05-22T08:32:53.423Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT03019133",
      "title": "Trial to Evaluate the Effects of Sound Modulation on Critically Ill Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Critical Illness",
        "Physiological Stress",
        "Delirium",
        "Sleep Deprivation"
      ],
      "interventions": [
        {
          "name": "Sound reduction",
          "type": "DEVICE"
        },
        {
          "name": "Sound masking",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Brian Gehlbach",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "99 Years",
        "sex": "ALL",
        "summary": "18 Years to 99 Years"
      },
      "enrollment_count": 120,
      "start_date": "2016-12",
      "completion_date": "2024-12-31",
      "has_results": false,
      "last_update_posted_date": "2025-04-06",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Iowa City, Iowa",
      "locations": [
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03019133"
    },
    {
      "nct_id": "NCT02958176",
      "title": "Heart Rate Variability Biofeedback for Female Sexual Arousal Disorder",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Female Sexual Arousal Disorder"
      ],
      "interventions": [
        {
          "name": "HRV Biofeedback",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Autogenic Training",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Texas at Austin",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 40 Years · Female only"
      },
      "enrollment_count": 65,
      "start_date": "2016-10",
      "completion_date": "2018-01",
      "has_results": false,
      "last_update_posted_date": "2018-10-11",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Austin, Texas",
      "locations": [
        {
          "city": "Austin",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02958176"
    },
    {
      "nct_id": "NCT04712656",
      "title": "Effects of CPAP Therapy on Blood Pressure and Heart Rate Variability in Obstructive Sleep Apnea",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Sleep Apnea, Obstructive"
      ],
      "interventions": [
        {
          "name": "CPAP therapy",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Ohio State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "30 Years to 75 Years"
      },
      "enrollment_count": 1739,
      "start_date": "2021-03-22",
      "completion_date": "2032-03-01",
      "has_results": false,
      "last_update_posted_date": "2025-07-24",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Columbus, Ohio",
      "locations": [
        {
          "city": "Columbus",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04712656"
    },
    {
      "nct_id": "NCT03259438",
      "title": "The Vitality Project for Fatigued Female Cancer Survivors",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Fatigue",
        "Cancer Survivorship"
      ],
      "interventions": [
        {
          "name": "Qigong",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Healthy Living (CHIP + Pre-Train)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "The Miriam Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 70 Years · Female only"
      },
      "enrollment_count": 75,
      "start_date": "2017-07-24",
      "completion_date": "2018-01-30",
      "has_results": false,
      "last_update_posted_date": "2017-08-23",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Providence, Rhode Island",
      "locations": [
        {
          "city": "Providence",
          "state": "Rhode Island"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03259438"
    },
    {
      "nct_id": "NCT06390072",
      "title": "Project Hypnos: The Impact of a Brief Hypnosis Intervention on Single-limb Dynamic Balance in People With Chronic Ankle Instability",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Ankle Sprains",
        "Motor Coordination or Function; Developmental Disorder"
      ],
      "interventions": [
        {
          "name": "Self-Hypnosis",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Ankle Education",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Ohio University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 24,
      "start_date": "2023-09-25",
      "completion_date": "2023-11-27",
      "has_results": false,
      "last_update_posted_date": "2024-04-29",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Athens, Ohio",
      "locations": [
        {
          "city": "Athens",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06390072"
    },
    {
      "nct_id": "NCT01330654",
      "title": "Heart Rate Variability (HRV) to Evaluate Surgical Risk on Patients on Beta Blockers",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cardiac Event Risk"
      ],
      "interventions": [
        {
          "name": "metoprolol",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "75 Years",
        "sex": "ALL",
        "summary": "40 Years to 75 Years"
      },
      "enrollment_count": 0,
      "start_date": "2011-03",
      "completion_date": "2012-03",
      "has_results": false,
      "last_update_posted_date": "2012-06-27",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Fresno, California",
      "locations": [
        {
          "city": "Fresno",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01330654"
    },
    {
      "nct_id": "NCT04094792",
      "title": "Depression, Trauma, and Health: Efficacy of an mHealth App for Symptom Self-Management in College Students",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Depression"
      ],
      "interventions": [
        {
          "name": "Happify Breather App",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Donna Schuman",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 0,
      "start_date": "2019-11-05",
      "completion_date": "2022-06-01",
      "has_results": false,
      "last_update_posted_date": "2022-01-04",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Lexington, Kentucky",
      "locations": [
        {
          "city": "Lexington",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04094792"
    },
    {
      "nct_id": "NCT06580847",
      "title": "Benefits of Choir for Older Adults With Unaddressed Hearing Loss (WP2)",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hearing Loss, Age-Related",
        "Speech Intelligibility",
        "Psychosocial Functioning"
      ],
      "interventions": [
        {
          "name": "Group Singing",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Audiobook Club",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Toronto Metropolitan University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "60 Years and older"
      },
      "enrollment_count": 210,
      "start_date": "2025-04-15",
      "completion_date": "2026-09",
      "has_results": false,
      "last_update_posted_date": "2025-09-18",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06580847"
    },
    {
      "nct_id": "NCT02640690",
      "title": "Trauma-Sensitive Yoga for Female Veterans With PTSD Who Experienced Military Sexual Trauma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Stress Disorders, Post-traumatic"
      ],
      "interventions": [
        {
          "name": "Trauma Center Trauma Sensitive Yoga Intervention (TCTSY)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Cognitive Processing Therapy",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 131,
      "start_date": "2016-01-01",
      "completion_date": "2021-09-30",
      "has_results": true,
      "last_update_posted_date": "2024-10-08",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 2,
      "location_summary": "Decatur, Georgia • Portland, Oregon",
      "locations": [
        {
          "city": "Decatur",
          "state": "Georgia"
        },
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02640690"
    },
    {
      "nct_id": "NCT04233606",
      "title": "Influence of Osmotic Stimulation of Vasopressin on Autonomic Function",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Water Stress",
        "Body Water Dehydration"
      ],
      "interventions": [
        {
          "name": "Hypertonic Saline",
          "type": "OTHER"
        },
        {
          "name": "Normal Saline",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of North Carolina, Greensboro",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "18 Years to 35 Years"
      },
      "enrollment_count": 0,
      "start_date": "2023-11",
      "completion_date": "2024-07",
      "has_results": false,
      "last_update_posted_date": "2023-11-13",
      "last_synced_at": "2026-05-22T08:32:53.423Z",
      "location_count": 1,
      "location_summary": "Greensboro, North Carolina",
      "locations": [
        {
          "city": "Greensboro",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04233606"
    }
  ]
}