The goal of this application is to determine whether changing the timing of food intake prevents the adverse metabolic effects of circadian misalignment.
Shift work is associated with circadian misalignment and an increased risk for the development diabetes, obesity, and cardiovascular disease. This research will determine whether changing the feeding schedule can prevent metabolic alterations that can lead to the abovementioned disorders. This research will provide mechanistic insight and may provide a novel therapeutic approach against the increased risk for diabetes, obesity, and cardiovascular disease among shift workers.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
SINGLE
Enrollment
20
Brigham and Women's Hospital
Boston, Massachusetts, United States
Change in plasma leptin levels across sleep/wake cycle
Frequent blood samples
Time frame: During circadian alignment (Day 7) and circadian misalignment (Day 10-11)
Change in circadian profile of plasma leptin
Frequent blood samples
Time frame: During constant routine before forced desynchrony (Days 3-4) and constant routine after forced desynchrony (Days 12-13)
Change in glucose tolerance
Frequent blood samples before and after standardized meals
Time frame: During circadian alignment (Day 7) and circadian misalignment (Day 10-11)
Change in circadian profile of plasma glucose levels
Frequent blood samples
Time frame: During circadian alignment (Day 7) and circadian misalignment (Day 10-11)
Change in plasma insulin levels after standardized test meal
Frequent blood samples before and after standardized meals
Time frame: During circadian alignment (Day 7) and circadian misalignment (Day 10-11)
Change in circadian profile of plasma insulin levels
Frequent blood samples
Time frame: During circadian alignment (Day 7) and circadian misalignment (Day 10-11)
o Change in circadian phase markers, such as from core body temperature, melatonin, and cortisol
Core temperature sensor throughout protocol, days 1-14. Frequent blood samples during constant routine before forced desynchrony (Days 3-4) and constant routine after forced desynchrony (Days 12-13)
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.
Time frame: Core temperature and frequent blood samples
Changes circadian rhythm in resting energy expenditure
Indirect calorimetry
Time frame: During constant routine before forced desynchrony (Days 3-4) and constant routine after forced desynchrony (Days 12-13)
Change in hunger and appetite, mood, and cognitive performance
Subjective hunger ratings and cognitive tests performed via computer interface
Time frame: Tests taken throughout the protocol, days 1-14
Changes in microbiota, gene expression, epigenetic or proteomic markers
Frequent blood samples and saliva samples
Time frame: samples taken during forced desychrony (days 7-11) and the constant routine protocols (days 3-4 and 11-13)
Changes in sleep
Polysomnography
Time frame: sleep periods following day 1, days 6-7 and days 10-11