www.pelagiaresearchlibrary.com t Available online a Pelagia Research Library European Journal of Experimental Biology, 2013, 3(1):559-563 ISSN: 2248 –9215 CODEN (USA): EJEBAU 559 Pelagia Research Library The comparison of blood parameters between morning and evening exercise Ibrahim Erdemir School of Physical Education and Sports, Balikesir University, Balikesir, Turkey _____________________________________________________________________________________ ________ ABSTRACT The purpose of this study was to research to the differences of blood parameters between morning exercise and evening exercises. 12 participants, in younger adults aged 20 years, were recruited and their blood was taken four times, from 8:00 to 9:00 (pre and post) for morning exercise and from 20:00 to 21:00 (pre and post) for evening exercise. The results found that leukocytes (WBC, NE and LY), erythrocytes (RBC, HGB, HCT, MCH and MCHC) and thrombocyte (PLT, MPV and PCT) show resulting differences (p<0.05) between the morning and evening exercises. Additionally, no significant differences were found in the other parameters in blood. In conclusion; Hematologic parameters display different behaviors exhibit acute exercise at different times of day. Leukocytes, erythrocytes and thrombocyte levels display different behaviors as exercises at morning and evening. Keywords: exercise, thrombocyte, erythrocytes, leukocytes, hematology _____________________________________________________________ ________________________________ INTRODUCTION Exercise is an important function of living systems. It affects many systems in our body. Human body adapts to exercise by breathing and by cardiovascular systems; such as, cardiac output is 20-25 liters during high intensity exercise [1] and also exercise may affect blood parameters. Physical and physiological response also plays an important role, in hematology [2]. When hematology is analyzed, the effect of acute exercise on hematological levels is seen different. It is stated that these differences depend on the severity, duration, exercise at different times of day and frequency of exercise as well as physical and physiological conditions of subjects [3]. Hematologic parameters, plasma, leukocytes and platelets, are very responsive to exercises which are done different time of day and different exercise [4]. Some changes in erythrocyte's metabolism and in affinity of hemoglobin to oxygen take place in organism of sportsmen-volleyball with high and low qualification under training loading [5]. Research has been found contradictory concerning the effects of training on red blood cells. The specific type and duration of exercise is of major importance in the adaptations of the blood cell system [6]. Training at various altitudes above the sea level also seems to increase hemoglobin more than training at sea level. When the number of red blood cells increases, their hemoglobin content causes the blood to become thicker and more resistant to flow through the body. It is very common for national and international level of athletes to exercise several times a day during their training regimes (i.e. perform multiple daily session). Most people do exercise at different times of day. However, the impact of the different times of daily exercise and multiple daily exercise sessions upon blood has not been researched