The effects of diurnal Ramadan fasting on energy expenditure and substrate oxidation in healthy men.
Abstract
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.
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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86295
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0x95644003c57E6F55A65596E3D9Eac6813e3566dA
Article ID:
86295
Unique Identifier:
10.1017/S0007114517003221
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Scimatic Chain (ID: 481)
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