Seasonal Variation in Energy Expenditure, Water Turnover, and Physical Activity in Adults
Trial statusNot yet recruiting
Trial phaseNot listed
Trial typeObservational
Biological sexAll
Age18-50
SponsorUniversity of Aberdeen
About this trial
This prospective observational study will investigate seasonal variation in total energy expenditure, water turnover, and physical activity in healthy adults living in or near Aberdeen, Scotland. Participants will complete two approximately 14-day measurement periods, one in winter and one in summer. Total energy expenditure and water turnover will be assessed using the doubly labelled water method, while physical activity and personal environmental exposure will be measured using wearable devices. The study will examine within-person differences between winter and summer and explore whether environmental factors, including ambient temperature, daylight, and sunlight exposure, are associated with changes in energy expenditure, water turnover, and physical activity.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
None
Disqualifiers
None
Trial population
Healthy adult volunteers aged 18-50 years living in or near Aberdeen, Scotland. Participants will be recruited from the general adult population through open advertisement and must be available to complete both winter and summer measurement periods. Recruitment will aim for approximately balanced representation of males and females.
Trial design
Design model
Cohort
Time perspective
Prospective
Treatments tested in this trial
Seasonal Environmental Exposure
Other interventionParticipants will be observed under naturally occurring winter and summer environmental conditions. Environmental exposures of interest include personal ambient temperature, time spent outdoors, relative humidity, and daylight/sunlight conditions. Personal ambient temperature and outdoor exposure will be characterised during each approximately 14-day measurement period using wearable temperature sensors and GPS-based monitoring. Relative humidity and daylight/sunlight conditions will be characterised using regional meteorological and environmental data. These exposures are not assigned or manipulated by the investigators and will be examined in relation to total energy expenditure, water turnover, and physical activity.
Treatment groups
30 Participants
are divided into 1 treatment groupGroup A: Healthy Adults1 intervention
Trial outcomes
Primary outcomes
1
Change in Total Energy Expenditure Between Winter and Summer
Within-participant difference in mean daily total energy expenditure between the winter and summer measurement periods. Total energy expenditure will be measured using the doubly labelled water method and expressed in MJ/day.
Time frame
Each approximately 14-day measurement period in winter and summerSecondary outcomes
1
Change in Physical Activity Between Winter and Summer
Within-participant difference in physical activity between the winter and summer measurement periods. Physical activity will be assessed using accelerometry, including overall activity level and time spent at different activity intensities.
Time frame
Continuously over each approximately 14-day measurement period in winter and summer2
Change in Water Turnover Between Winter and Summer
Within-participant difference in mean daily water turnover between the winter and summer measurement periods. Water turnover will be estimated from isotope elimination using the doubly labelled water method.
Time frame
Each approximately 14-day measurement period in winter and summerSponsors and contacts
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Source ClinicalTrials.gov
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