The effects of diurnal Ramadan fasting on energy expenditure and substrate oxidation in healthy men.

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ID: 86295
2017
The study aimed to examine the effects of diurnal Ramadan fasting (RF) on substrate oxidation, energy production, blood lipids and glucose as well as body composition. Nine healthy Muslim men (fasting (FAST) group) and eight healthy non-practicing men (control (CNT) group) were assessed pre- and post-RF. FAST were additionally assessed at days 10, 20 and 30 of RF in the morning and evening. Body composition was determined by hydrodensitometry, substrate oxidation and energy production by indirect calorimetry, blood metabolic profile by biochemical analyses and energy balance by activity tracker recordings and food log analyses. A significant group×time interaction revealed that chronic RF reduced body mass and adiposity in FAST, without changing lean mass, whereas CNT subjects remained unchanged. In parallel to these findings, a significant main diurnal effect (morning v. evening) of RF on substrate oxidation (a shift towards lipid oxidation) and blood metabolic profile (a decrease in glucose and an increase in total cholesterol and TAG levels, respectively) was observed, which did not vary over the course of the Ramadan. In conclusion, although RF induces diurnal metabolic adjustments (morning v. evening), no carryover effect was observed throughout RF despite the extended daily fasting period (18·0 (sd 0·3) h) and changes in body composition.
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Authors Alsubheen, Sana'a A;Ismail, Mohammad;Baker, Alicia;Blair, Jason;Adebayo, Adeboye;Kelly, Liam;Chandurkar, Vikram;Cheema, Sukhinder;Joanisse, Denis R;Basset, Fabien A;
Journal the british journal of nutrition
Year 2017
DOI 10.1017/S0007114517003221
URL
Keywords
body composition insulin ramadan bm body mass cho carbohydrate choox carbohydrate oxidation cnt control ee energy expenditure ep energy production fast fasting fat fat fatox lipid oxidation hr heart rate if intermittent fasting mr metabolic rate pro protein r1 10th day of rf r2 20th day of rf r3 30th day of rf rf ramadan fasting vs vital signs indirect calorimetry lipid profiles substrate oxidation

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