Urban Nature Experiences Reduce Stress in the Context of Daily Life Based on Salivary Biomarkers

Bibliographic Data

ID23329255
AuthorsMaryCarol R Hunter (University of Michigan, corresponding author), Brenda W Gillespie (0000-0003-4488-0612, University of Michigan), S Chen (0000-0001-5293-5287, University of Michigan), Sophie Yu-Pu Chen
Year2019
Volume10
Pages722-722
Publication date2019-04-04
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueFrontiers in Psychology (JOURNAL)
Journal identifiersISSN: 1664-1078 • E-ISSN: 1664-1078
PublisherFrontiers Media SA (PUBLISHER • CH)
DOI10.3389/fpsyg.2019.00722
PMID31019479
OpenAlexW2933909757
LanguageEN
Citations received77
References cited63

Stress reduction through contact with nature is well established, but far less is known about the contribution of contact parameters - duration, frequency, and nature quality. This study describes the relationship between duration of a nature experience (NE), and changes in two physiological biomarkers of stress - salivary cortisol and alpha-amylase. It is the first study to employ long-term, repeated-measure assessment and the first evaluation wherein study participants are free to choose the time of day, duration, and the place of a NE in response to personal preference and changing daily schedules. During an 8-week study period, 36 urban dwellers were asked to have a NE, defined as spending time in an outdoor place that brings a sense of contact with nature, at least three times a week for a duration of 10 min or more. Their goal was compliance within the context of unpredictable opportunity for taking a nature pill. Participants provided saliva samples before and after a NE at four points over the study period. Before-NE samples established the diurnal trajectory of each stress indicator and these were in line with published outcomes of more closely controlled experiments. For salivary cortisol, an NE produced a 21.3%/hour drop beyond that of the hormone's 11.7% diurnal drop. The efficiency of a nature pill per time expended was greatest between 20 and 30 min, after which benefits continued to accrue, but at a reduced rate. For salivary alpha-amylase, there was a 28.1%/h drop after adjusting for its diurnal rise of 3.5%/h, but only for participants that were least active sitting or sitting with some walking. Activity type did not influence cortisol response. The methods for this adaptive management study of nature-based restoration break new ground in addressing some complexities of measuring an effective nature dose in the context of normal daily life, while bypassing the limitations of a clinical pharmacology dose-response study. The results provide a validated starting point for healthcare practitioners prescribing a nature pill to those in their care. This line of inquiry is timely in light of expanding urbanization and rising healthcare costs.

Context (archaeology) · Developmental psychology · Stress (linguistics) · Climate Change and Health Impacts · Clinical Psychology · Noise Effects and Management · Psychology · Urban Green Space and Health

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