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This study examined how different patterns of nutrient delivery (constant versus bolus) affect biological rhythms in human skeletal muscle. Healthy adults with a body mass index between 19 and 30 and a regular sleep pattern were eligible. The study had no assigned phase and has been completed.
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Inclusion Criteria: * Body mass index \>19 but \<30 kg/m2 * Be able and willing to give informed oral and written consent, complete and meet the defined criteria of pre-study questionnaires and screens, * Have a regular sleep cycle with a sleep duration between 6 and 8 hours, do not exhibit extreme morning or evening preference (Horne and Ostberg, 1976) * Agree to keep a constant sleep/wake cycle with a self-selected 8 hour sleep duration (from which it cannot be deviated by more than 30 minutes) for one week prior to the lab study, * Obtain 15 minutes of sunlight within 1.5 hours of waking up and agree to nap only within a 4 h designated nap window for one week prior to the lab study, * Allow confirmation of compliance to these instructions by wearing ActiHeart monitors continuously and complete daily sleep and event diaries for one week before the study session, * Agree to refrain from alcohol, caffeine, heavy exercise and certain food components TWO days before the study session, * Agree to weigh and record daily meals (based on individual energy requirements) for TWO days prior to the study, * Agree to refrain from prescribed and 'over the counter' medication and food/vitamin supplements for a wash-out period three weeks before and during the study. Exclusion Criteria: * Are taking regular medication (also non-prescribed) or food supplements (e.g vitamins, minerals, fish oil, antioxidant tablets) from which it is not possible to refrain, known to influence: Sleep/alertness/the circadian timing system (e.g beta-blockers, barbituates, antidepressants, benzodiazepines, melatonin, ritalin, modafinil, soporifics, St John's Wort), any of the metabolic functions (e.g. affecting thyroid, kidney, liver or gastrointestinal function) * Any of the inflammatory markers (e.g. aspirin, ibuprofen, antiobiotics, hay fever medication, medication for sore throats and colds) * And/or any of the endothelial markers (e.g. ACE inhibitors and angiotensin (receptor) blockers, diuretics, Beta-blockers, anti-thrombosis medication), * Have a history of any circadian or sleep disorder or metabolic, cardiovascular or chronic infectious / inflammatory disease as confirmed by the GP or the pre-study questionnaires (e.g. a Pittsburgh Sleep Quality Index \> 5 will result in exclusion), * Have a history of psychiatric or neurological disease or drug and alcohol abuse, * Have donated over 400 ml of blood in the three months preceding the study, * Have participated in shift work or have travelled across more than two time zones within three weeks of the study, * Do not keep a regular sleep-wake cycle, * Do not refrain from alcohol, caffeine containing drinks (e.g. coffee, coke, tea, redbull), heavy exercise and certain foods (e.g. those high in fat and green vegetables) TWO days before and during the laboratory session, * Normally consume more than 4 cups of caffeinated beverages (e.g. tea, coffee, cola) daily * Smokers