title: Effect of Ramadan fasting on platelet aggregation in healthy male subjects.
abstract: The purpose of this study was to examine platelet aggregation during Ramadan fasting. A group of 20 healthy non-smoking male volunteers were studied, whose mean age was [21 (SD 2.4) years range 19-24]. The average fast was about 15 h. Venous blood samples were taken on 4 different days; 1 day before Ramadan (day 0), then on the 1st, 14th and 28th day of Ramadan. On each of these 4 days, blood samples were taken at 4 p.m. (1 h before the evening meal). Body mass index and platelet count did not change during fasting. Bleeding and coagulation time had increased significantly by the end of Ramadan fasting (P < 0.05, P < 0.005 respectively), but these changes remained within physiological limits. Ramadan fasting induced a reduction in platelet sensitivity to adenosine 5'-diphosphate (ADP) and collagen on days 14 (P < 0.05) and 28 (P < 0.05, P < 0.005 respectively). However, adrenaline-induced platelet aggregation decreased only on day 28 (P < 0.05). This study indicated that Ramadan fasting led to a decrease in the platelet responses of different aggregating agents (ADP, adrenaline and collagen) in vitro. It also led to an increase in bleeding and coagulation time.
authors.affiliation: Department of Physiology, Faculty of Medicine, Dicle University, Anabilim Dali, Diyarbakir, Turkey.
authors.forename: M
authors.initials: M
authors.lastname: Aybak
authors.forename: A
authors.initials: A
authors.lastname: Türkoğlu
authors.forename: A
authors.initials: A
authors.lastname: Sermet
authors.forename: O
authors.initials: O
authors.lastname: Denli
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D000328:Adult; D001792:Blood Platelets / Q000187:drug effects / Q000502:physiology; D015992:Body Mass Index; D003094:Collagen / Q000494:pharmacology; D004837:Epinephrine / Q000494:pharmacology; D005215:Fasting / Q000097:blood*; D006801:Humans; D007514:Islam; D008297:Male; D010974:Platelet Aggregation; D013997:Time Factors
chemical_list: D000244:Adenosine Diphosphate; D003094:Collagen; D004837:Epinephrine