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NCT07379164: GREEN-OI
Psychophysiological Effects of Green Exercise in Outdoor Green vs. Indoor Control
NA trial testing Outdoor Green Group in Psychological Stress in 80 participants. Completed in 15 December 2025.
1 May 2025
Quick facts
| Lead sponsor | Lincoln University College |
|---|---|
| Phase | NA |
| Status | Completed |
| Study type | INTERVENTIONAL |
| Allocation | randomized |
| Design | parallel |
| Masking | none |
| Primary purpose | basic science |
| Enrollment | 80 |
| Start date | 1 March 2025 |
| Primary completion | 1 May 2025 |
| Estimated completion | 15 December 2025 |
| Sites | 1 location across China |
Drugs / interventions tested
- Outdoor Green Group
- Indoor Control Group
Conditions studied
- Psychological Stress — all drugs for Psychological Stress →
- Mental Fatigue — all drugs for Mental Fatigue →
- Cognitive Dysfunction — all drugs for Cognitive Dysfunction →
- Emotional Well-being — all drugs for Emotional Well-being →
Sponsor
Lincoln University College
Who can join
Adults 18 to 30, any sex, with Psychological Stress or Mental Fatigue. Patients with the condition only — healthy volunteers not accepted.
Sponsor's own description
Core Purpose: Researchers want to learn if walking in an outdoor green environment helps people recover from mental tiredness and stress better than walking indoors. This study investigates how a 30-minute walk in an outdoor green setting affects the mind and body compared to a 30-minute walk on a treadmill in a room without windows. The Study Process: The study included 80 healthy young adults between the ages of 18 and 35. Researchers randomly split the participants into two groups. 1. The Outdoor Green group: Participants walked for 30 minutes on a path in an outdoor green environment. 2. The Indoor Control group: This group walked for 30 minutes on a treadmill in a windowless room. What is Being Measured: To understand how the environment helps the brain recover, researchers used a "Sensory-to-Appraisal" model to measure several factors. 1. Information Harvesting: Researchers used a new tool called the Nature Sensory Sensitivity Index (NSSI). This measures how well participants notice and "capture" sensory details from their surroundings, like the sounds of birds or the textures of plants. 2. Restorative Feelings: Using the Perceived Restorativeness Scale (PRS), participants reported if they felt the environment helped them "get away" from daily stress and if the setting was interesting or beautiful. 3. Overall Mood Changes (POMS TMD): Researchers used the Profile of Mood States (POMS) to calculate a Total Mood Disturbance (TMD) score. This helps show if participants feel less tense, angry, or tired, and more energetic after the walk. 4. Connection to Nature (NR): Researchers measured each participant's Nature Relatedness (NR). This describes how much a person naturally feels connected to the natural world, which may influence how much they benefit from the green walk. 5. Attention and Thinking: Participants performed a "Digit Span Task" (repeating sequences of numbers) to test if their focus improved. 6. Physical Stress: The study used objective markers, including salivary cortisol (a stress hormone) and heart rate variability (a measure of how the nervous system relaxes). Why This Matters: The goal of this research is to see if actively noticing an outdoor green environment (sensory harvesting) is the "key" that unlocks mental recovery. By comparing the Outdoor Green group with the Indoor Control group, this study helps us understand why nature is good for public health and how to design better spaces for stress relief.
Publications & conference data
No peer-reviewed publications indexed yet for this trial. Completed trials usually publish results within 12-18 months.
Verify or expand the search:
- PubMed search for NCT07379164
- Europe PMC full search
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Verify against primary sources
- ClinicalTrials.gov — authoritative US registry record
- WHO ICTRP — international registry index
- EU Clinical Trials Register
- Sponsor press releases (Google)
- Trial protocol + status: ClinicalTrials.gov NCT07379164 (US National Library of Medicine, public domain)
- Drug + disease cross-links: matched in real time against Drug Landscape's normalised drug + company + condition tables
- Sponsor: as reported to ClinicalTrials.gov by Lincoln University College
- Last refreshed: 30 January 2026
Drug Landscape aggregates and links these public records for informational use only. Always verify against the primary source before clinical or regulatory decisions. Canonical URL: https://druglandscape.com/trial/NCT07379164.
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