Your Body Knows Before You Do

When you live in the Alps, hiking is not something you plan for the weekend but rather everyday life. When I walk for hours, something happens to me that is initially unspectacular but eventually becomes the feeling you keep seeking. The body moves, nature calms the senses and at some point I stop thinking. I walk and look, take in the impressions, the sound of a stream, the wind and enjoy the state that comes all on its own. Then I switch off completely and that is what pretty much all hikers report when they walk.

Then I enter a mountain hut. The menu can be as good as it wants. If the atmosphere is wrong I am quickly back outside.

This room is the risk on a hike. It works or it repels. What nature almost never does, rooms certainly can. The smell, the noise, the cold, tiled floors instead of wood, fluorescent light. The stench of grease from the kitchen and all of that creates a room atmosphere you cannot choose. You really want nothing but that idyllic cosiness yet reality is often coldness and that is immediately off-putting.

When the naturalness from outside continues inside the room, it feels completely different. Wood, warm light, an open fireplace and the state is different. The transition from outside to inside is harmonious. But a cool room with hard contrasts, modern materials, black and white design language flips the state instantly.

I currently live right next to the large ski resorts in Tyrol and a shift is becoming ever more visible. Where there used to be nostalgia there are now central phone charging stations. They bring the modernity that does not only come from the city. We all want to feel comfortable and we do when everything works and the phone is charged. Efficiency becomes significantly more relevant when building in the Alps, especially for tourism. First it was mass processing with a currywurst on a tray, now comes modern design, open spaces, lots of light and even more efficiency. Slowing down, lingering, leisure, all of that fades into the background.

I wonder whether this is just my sensitivity or whether science confirms what I feel.

Four to seven minutes

Roger Ulrich ran an experiment in 1991 that remains one of the most cited in environmental psychology (Ulrich et al., 1991, Journal of Environmental Psychology). 120 subjects watched a stress-inducing film about workplace accidents. Then they watched either a nature video or a city video. The following body responses were measured: heart rate, blood pressure, skin conductance and facial muscle tension.

Skin conductance responded fastest. Within the first three minutes the difference was significant. After four to seven minutes all four indicators had diverged. The nature group recovered faster and more completely. Heart rate slowed to its lowest level since the stress film. With the city videos it accelerated.

What was remarkable was not just the speed. Nature did not simply return subjects to their baseline. It pushed them beyond it. Mood after the nature video was more positive than before the stress film.

Forest or water, heavy or light traffic

Ulrich showed two different nature videos. One with forest, one with water. No significant difference was detectable. That means it is not the intensity that decides but the category. Nature or not. The body does not distinguish between forest and lake. But it immediately distinguishes between nature and city.

A state like meditation

In the paper Ulrich expressed a hypothesis he could not prove but that struck me. He wrote that nature may trigger a “meditation-like state with open eyes.” Parasympathetically dominated. Awake but deeply relaxed.

I know this state. Not from theory but from hiking. After hours in nature I am awake and at the same time so calm that any disturbance immediately stands out. Ulrich measured this in 1991. I have experienced it a hundred times since.

He found 36 correlations between positive feelings and body measurements. All in the expected direction. The better the mood the slower the heart, the lower the blood pressure, the less skin conductance. The body and mood speak the same language.

What happens when you enter a room

Twelve years after Ulrich, Terry Hartig moved the experiment into the field (Hartig et al., 2003, Journal of Environmental Psychology). This time one group of 112 subjects walked through a nature reserve and the other through a city. Before and after each group sat in a room. The nature group in a room with a view of trees and the city group in a windowless room.

Something happened already during the ten minutes of sitting: diastolic blood pressure dropped significantly for those with the tree view. For those without a window it did not. Then the walk. After 30 minutes systolic blood pressure in the nature group was about 6 mmHg lower than in the city group. That corresponds to the effect of mild blood pressure medication.

But then something unexpected happened. When the subjects turned around and walked back toward the lab the values converged again. The body was not only responding to the environment. It was responding to the direction. Walking back meant the nature visit was ending. The body registered that before the subjects thought about it.

Two separate processes

Hartig found something else that is little known. Attention and blood pressure developed differently in the two environments. But they did not correlate with each other.

That means nature calms the body and sharpens attention but through two different pathways. And the attention improvement came less from nature improving attention than from the city degrading it.

When I enter a mountain hut after a long day of hiking both systems are active. My body is deeply relaxed. My attention is sharpened. I notice more. The cold floor, the wrong light, the smell. In the city I would ignore all of that because my attention would already be exhausted.

Science has no direct evidence for this. But Koivisto showed in 2022 (Koivisto et al., 2022, Frontiers in Psychology) that people who grew up in nature find cities more aversive. More nature experience increases sensitivity to non-natural environments. It does not decrease it.

Anger in the city, calm in nature

In Hartig’s study anger decreased in nature and increased in the city. The authors highlighted this because anger is clinically relevant. It is linked to cardiovascular disease and to violence. A city that generates anger generates disease and conflict. A natural space that reduces anger generates health and calm.

The drive to the test site was itself a stressor. 40 minutes of driving raised systolic blood pressure by nearly 8 mmHg. That was not part of the experiment. It was the commute. Everyday life.

The data exists

Ulrich’s 1991 paper has over 3,000 citations. Hartig’s study is among the most cited field studies in environmental psychology. The data is not new and not controversial.

But mountain huts in ski resorts are built with tiled floors. Efficiency replaces cosiness and science everywhere: children sit in windowless classrooms, employees in air-conditioned open-plan offices, patients in hospitals without a view of trees.

Parents should ask themselves what rooms their children learn in. Employees should ask themselves why they are more exhausted after eight hours in an office than after eight hours outside. Business owners should calculate what productivity loss from bad rooms costs. Investors should calculate what sick days cost that better buildings could prevent.

Your body knows before you consciously notice. Four to seven minutes earlier to be precise. The data is quite precise but it is neither read nor applied.