{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=HIIT-only",
    "query": {
      "intervention": "HIIT-only"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 14,
    "total_pages": 2,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=HIIT-only&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-03T17:24:10.981Z",
  "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": "NCT03380923",
      "title": "Precision High-Intensity Training Through Epigenetics (PHITE)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Moderate Intensity",
          "type": "BEHAVIORAL"
        },
        {
          "name": "High Intensity",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Alabama at Birmingham",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "27 Years",
        "sex": "ALL",
        "summary": "18 Years to 27 Years"
      },
      "enrollment_count": 239,
      "start_date": "2017-02-23",
      "completion_date": "2021-07-31",
      "has_results": false,
      "last_update_posted_date": "2021-10-07",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Birmingham, Alabama",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03380923"
    },
    {
      "nct_id": "NCT05012878",
      "title": "Cardiac Rehab and Cerebral Blood Flow Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cardiovascular Diseases"
      ],
      "interventions": [
        {
          "name": "Cardiac rehabilitation - high intensity interval training (HIIT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Cardiac rehabilitation - moderate intensity continuous training (MICT)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Cardiac rehabilitation - control",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Cardiac rehabilitation - observational",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "40 Years and older"
      },
      "enrollment_count": 45,
      "start_date": "2021-09-02",
      "completion_date": "2025-04-23",
      "has_results": false,
      "last_update_posted_date": "2025-05-29",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05012878"
    },
    {
      "nct_id": "NCT03162978",
      "title": "Sprint to Fitness: Effect of Outcome Expectations on Responses to Interval Exercise Training",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Overweight",
        "Obesity"
      ],
      "interventions": [
        {
          "name": "HIIT + POE",
          "type": "OTHER"
        },
        {
          "name": "HIIT only",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "USDA Grand Forks Human Nutrition Research Center",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 66,
      "start_date": "2017-11-29",
      "completion_date": "2019-10-21",
      "has_results": false,
      "last_update_posted_date": "2025-04-11",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Grand Forks, North Dakota",
      "locations": [
        {
          "city": "Grand Forks",
          "state": "North Dakota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03162978"
    },
    {
      "nct_id": "NCT06258941",
      "title": "Classroom Break, Cognition, and Fitness in Elementary School Children",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Healthy Volunteers"
      ],
      "interventions": [
        {
          "name": "MF-HIIT",
          "type": "BEHAVIORAL"
        },
        {
          "name": "HIIT-only",
          "type": "BEHAVIORAL"
        },
        {
          "name": "MF-only",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Sedentary activity",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Purdue University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "8 Years",
        "maximum_age": "12 Years",
        "sex": "ALL",
        "summary": "8 Years to 12 Years"
      },
      "enrollment_count": 352,
      "start_date": "2025-02-14",
      "completion_date": "2027-05-31",
      "has_results": false,
      "last_update_posted_date": "2026-06-25",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Royal Center, Indiana",
      "locations": [
        {
          "city": "Royal Center",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06258941"
    },
    {
      "nct_id": "NCT03568214",
      "title": "Personalized Moderate Intensity Exercise Training Combined With High Intensity Interval",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Exercise",
        "Metabolic Syndrome"
      ],
      "interventions": [
        {
          "name": "Exercise",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Western Colorado University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 45,
      "start_date": "2018-01-01",
      "completion_date": "2019-03-31",
      "has_results": false,
      "last_update_posted_date": "2018-06-26",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Gunnison, Colorado",
      "locations": [
        {
          "city": "Gunnison",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03568214"
    },
    {
      "nct_id": "NCT07727577",
      "title": "Cardiorespiratory Fitness and Acute High-Intensity Exercise Effects on Brain and Cognitive Function in Older Adults",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Healthy Aging",
        "Cognitive Benefits",
        "Cardio Respiratory Fitness",
        "Brain Activity"
      ],
      "interventions": [
        {
          "name": "High-Intensity Interval Training",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Colby-Sawyer College",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": "79 Years",
        "sex": "ALL",
        "summary": "55 Years to 79 Years"
      },
      "enrollment_count": 50,
      "start_date": "2026-09-01",
      "completion_date": "2028-08-01",
      "has_results": false,
      "last_update_posted_date": "2026-08-12",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "New London, New Hampshire",
      "locations": [
        {
          "city": "New London",
          "state": "New Hampshire"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07727577"
    },
    {
      "nct_id": "NCT04416243",
      "title": "Feasibility of a High-intensity Interval Training Program in Persons With Multiple Sclerosis Who Have Walking Disability",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Multiple Sclerosis"
      ],
      "interventions": [
        {
          "name": "Recumbent Stepping, High-Intensity Interval Training",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of North Texas, Denton, TX",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 17,
      "start_date": "2019-12-19",
      "completion_date": "2022-12-14",
      "has_results": false,
      "last_update_posted_date": "2023-04-19",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Denton, Texas",
      "locations": [
        {
          "city": "Denton",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04416243"
    },
    {
      "nct_id": "NCT05625204",
      "title": "High Intensity Interval Training (HIIT) to Reduce Frailty and Enhance Resilience in Older Veterans",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Frailty"
      ],
      "interventions": [
        {
          "name": "Center based attention (stretching only) control",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Center based HIIT",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Home based HIIT",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2024-01-29",
      "completion_date": "2027-09-30",
      "has_results": false,
      "last_update_posted_date": "2025-12-12",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 2,
      "location_summary": "Kansas City, Missouri",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Missouri"
        },
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05625204"
    },
    {
      "nct_id": "NCT07518888",
      "title": "Exercise-induced Steroid Changes in Active Surveillance for Prostate Cancer",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "High-Intensity Interval Training (HIIT) Exercise",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Miami",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "80 Years",
        "sex": "MALE",
        "summary": "18 Years to 80 Years · Male only"
      },
      "enrollment_count": 49,
      "start_date": "2026-08",
      "completion_date": "2028-08",
      "has_results": false,
      "last_update_posted_date": "2026-07-17",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Miami, Florida",
      "locations": [
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07518888"
    },
    {
      "nct_id": "NCT03810963",
      "title": "FES Cycling and Nutritional Counseling for Battling Obesity After SCI",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Spinal Cord Injuries"
      ],
      "interventions": [
        {
          "name": "HIIT-FES Cycling combined with Nutritional Counseling",
          "type": "COMBINATION_PRODUCT"
        },
        {
          "name": "Nutritional Counseling Only",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "COMBINATION_PRODUCT",
        "OTHER"
      ],
      "sponsor": "William Carey University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "21 Years to 65 Years"
      },
      "enrollment_count": 15,
      "start_date": "2017-05-01",
      "completion_date": "2019-05-01",
      "has_results": false,
      "last_update_posted_date": "2019-10-04",
      "last_synced_at": "2026-09-03T17:24:10.981Z",
      "location_count": 1,
      "location_summary": "Hattiesburg, Mississippi",
      "locations": [
        {
          "city": "Hattiesburg",
          "state": "Mississippi"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03810963"
    }
  ]
}