Trial reportThe journal of nutrition, health & aging2020
Sunlight Exposure and Vitamin D Levels in Older People- An Intervention Study in Swedish Nursing Homes.
Trial report in The journal of nutrition, health & aging, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
12 citing papers in PubMed, 1 synthesis or guideline pooled it, 35 citations in OpenAlex.
- Vitamin D deficiency in nursing home residents: a systematic review.Nutrition reviews · 2023Pooled it
- 25-Hydroxyvitamin D in Cancer Patients Admitted to Palliative Care: A Post-Hoc Analysis of the Swedish Trial 'Palliative-D'.Nutrients · 2022Trial
- Serum 25-hydroxyvitamin D and cognitive performance in hospitalized older adults: a cross-sectional study from Central Poland.Frontiers in nutrition · 2026Article
- Impact of changes in leisure activities on incident disability among older adults: a nationwide cohort study.Journal of global health · 2025Article
- Paradoxical Associations Between Sun-Protective Behaviours and Mortality: Evidence From a Nationally Representative Cohort.Acta dermato-venereologica · 2025Article
- Association between vitamin D level and sleep quality in the elderly population: a prospective cohort study.Sleep & breathing = Schlaf & Atmung · 2025Article
- Association of changes in overall and specific leisure activities with long-term all-cause mortality in older adults: a nationwide cohort study.Journal of global health · 2025Article
- Joint effect of modifiable risk factors on Parkinson's disease: a large-scale longitudinal study.Frontiers in human neuroscience · 2025Article
- A healthful plant-based diet is associated with higher health-related quality of life among older adults independent of circulating CRP: a cross-sectional analysis from the Lifelines Cohort Study.Journal of nutritional science · 2025Article
- Gender Differences in the Interplay between Vitamin D and Microbiota in Allergic and Autoimmune Diseases.Biomedicines · 2024Review
- Knowledge, attitudes and practices (KAP) of medical university students towards vitamin D deficiency in Saudi Arabia: a cross-sectional study.Journal of pharmaceutical policy and practice · 2024Article
- Inadequate Physical Activity Is Associated with Worse Physical Function in a Sample of COVID-19 Survivors with Post-Acute Symptoms.Journal of clinical medicine · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivesOlder people are recommended to take oral vitamin D supplements, but the main source of vitamin D is sunlight. Our aim was to explore whether active encouragement to spend time outdoors could increase the levels of serum 25-hydroxyvitamin D (25(OH)D) and increase the mental well-being of nursing home residents.
designA cluster randomized intervention trial.
settingNursing homes in southern Sweden.
participantsIn total 40 people >65 years.
interventionThe intervention group was encouraged to go outside for 20-30 minutes between 11 a.m. and 3 p.m. every day for two months during the summer of 2018. MEASUREMENTS: We analyzed serum 25(OH)D before and after the summer. Data from SF-36 questionnaires measuring vitality and mental health were used for the analyses.
resultsIn the intervention group, the baseline median (interquartile range (IQR)) of serum 25(OH)D was 42.5 (23.0) nmol/l and in the control group it was 52.0 (36.0) nmol/l. In the intervention group, the 25(OH)D levels increased significantly during the summer (p=0.011). In the control group, there was no significant change. The intervention group reported better self-perceived mental health after the summer compared to before the summer (p=0.015). In the control group, there was no difference in mental health.
conclusionActive encouragement to spend time outdoors during summertime improved the levels of serum 25(OH)D and self-perceived mental health significantly in older people in nursing homes and could complement or replace oral vitamin D supplementation in the summer.
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