When Florence Nightingale reformed hospitals in the 19th century, she insisted on fresh air, daylight, and views of greenery—not out of romance, but from observation: patients in calm, bright rooms recovered better. Her evidence-based nursing practice was a turning point that brought nature as a therapeutic ally into healthcare. Today, modern studies confirm what Nightingale intuitively understood: nature is not decoration but an active catalyst for healing, mood, and performance—even in rehabilitation ([1]).
Rehabilitation goes beyond just physical therapy; it integrates the body, brain, and behavior. Nature plays a role through multiple channels. First, it calms the autonomic nervous systeminvoluntary stress regulation system, lowers stress responses, and facilitates regeneration. Second, it alleviates attentional fatiguemental resources that tire in the face of sensory overload; green stimuli promote effortless, "soft" attention. Third, light stabilizes the circadian rhythminternal 24-hour clock of sleep, hormones, temperature, which modulates healing, mood, and cognitive performance. Fourth, engaging in activities in nature—walking, gardening—simultaneously activates sensory, motor, and social pathways, which can promote neuroplasticity. The result: reduced fatigue, better mood, more consistent recovery—measurable and actionable.
Regular walks in nature significantly improve mental health. In a comparison of three everyday conditions, a 50-minute forest walk resulted in the strongest and most consistent improvements in mood and stress—better than a walk on the street and clearly better than usual activities ([2]). Indoor spaces without daylight, on the other hand, disrupt sleep and hormonal rhythms: even a few lux of artificial light at night decrease melatonin and fragment sleep ([3]); cyclic light management in intensive care prolongs deep and total sleep and stabilizes physiological parameters ([4]). When designing environments, it is essential that green, biophilic elements in hospitals reduce stress, improve mood, and can accelerate recovery—even in highly restricted settings ([5], [1]). Finally, horticultural therapy shows small to moderate benefits for mental health in chronic illnesses; physical and general health benefits are less pronounced but measurable ([6]). Historically applied in neurorehabilitative gardens, it promotes sensory-motor functions, social participation, and life satisfaction ([7]).
First: In an experimental study with three conditions, it was found that walking per se improves mental health, while a forest environment has the greatest and most consistent effect—indicating that movement and nature have additive effects and can be combined in rehabilitation programs ([2]). Second: Quasi-randomized studies with stroke patients compared wards with natural, time-regulated lighting to standard light. The results: more stabilized melatonin rhythms and higher melatonin levels after the intervention, as well as significantly fewer depressive symptoms, less anxiety, and greater well-being at discharge—without cognitive disadvantages ([8], [9]). The relevance: Light is a modifiable lever that improves sleep, mood, and thereby enhances rehabilitation engagement. Third: Systematic reviews of biophilic design in hospitals demonstrate that real nature stimuli (plants, gardens, daylight) reduce stress, pain perception, and sleep problems and increase satisfaction; simulated nature has a moderate effect but remains useful when real nature is not possible ([1], [5]). Additionally, a recent meta-analysis on horticultural therapy for chronically ill patients points to small to moderate effects on mental health—practical and scalable, but with a need for more robust long-term data ([6]).
- Plan 3–5 nature walks per week lasting 30–50 minutes; prioritize green paths or parks. If only city streets are possible, walk anyway—the mood benefit remains, and the forest enhances it ([2]).
- Structure “light like outdoors”: bright, blue-enriched light in the morning for 30–60 minutes; warm, dimmed light in the evening, complete darkness at night (max. <5 lux) to protect melatonin and sleep quality ([3], [4]). In facilities: install or adjust time-regulated lighting systems ([8], [9], [10]).
- Design your rehabilitation space to be biophilic: real plants, wood, and natural materials, sightlines to greenery, and—where possible—access to a small healing garden. Even modular, low-maintenance planting systems can work when space is limited ([5], [1]).
- Integrate horticultural therapy 1–2 times a week: sowing, repotting, harvesting. Start with light tasks and ergonomic tools; the goal is sensory-motor training plus mood enhancement ([7], [6]).
- Reduce screen time in the evening and replace 20–30 minutes of scrolling with a slow walk outdoors or garden care. This supports sleep and mental balance; excessive screen time correlates with poorer sleep and complaints—especially relevant for younger people, but a principle generally transferable ([11], [3]).
Utilize nature as rehabilitation technology: walking in green spaces, smart lighting, biophilic environments, and simple gardening accelerate recovery and uplift mood. Start this week with three nature walks, limit light in the evening, and create a green element in your surroundings. Small, consistent steps build the path to more energy, joy in life, and high performance.
This health article was created with AI support and is intended to help people access current scientific health knowledge. It contributes to the democratization of science – however, it does not replace professional medical advice and may present individual details in a simplified or slightly inaccurate manner due to AI-generated content. HEARTPORT and its affiliates assume no liability for the accuracy, completeness, or applicability of the information provided.
