Abstract
Background: Circadian rhythm and physical activity are factors that influence the homeostasis of blood. This study aimed to investigate the effect of exhaustive exercise in the morning and evening on the blood hemostasis in female athletes. Methods: In the present quasi-experimental study, 30 female athletes aged 18-25 were selected by convenience sampling method and randomly divided into two groups (morning and afternoon exercises). The standard Bruce protocol test was used. In the present study, platelets, fibrinogen, and thromboplastin time were measured as indicators of blood coagulation before and after testing. Paired t-test and covariance analysis were used to analyze the measured indices and P ≤ 0.05 was considered significant. Results: An acute exhausting aerobic training session in both groups significantly increased platelet and fibrinogen levels, but a significant decrease was observed in thromboplastin time. Considering the training time, significant difference was observed in the blood thromboplastin time in the morning in comparison with the afternoon. Conclusion: According to the results of this study, the circadian rhythm and acute exhausting aerobic training are effective factors on the blood coagulation and a training session in the morning compared with the evening training has a greater effect on the blood coagulation.
Highlights
Cardiovascular disease is one of the most common causes of death in the world.[1]
In this study, the effect of exhaustive exercise on the blood homeostasis of female athletes was investigated in the morning and afternoon
The results of the present study showed that a single session of exhausting exercise significantly increased the blood platelets in the female athletes in both morning and evening groups
Summary
Cardiovascular disease is one of the most common causes of death in the world.[1]. One of the principal causes of this disease is thrombosis due to the increased activity of coagulation factors and the imbalance in hemostasis.[2]. Physical activity affects the homeostatic system and prevents heart disease.[3] a number of studies have reported that acute physical exercise can increase the activity of clotting factors, an underlying factor in the formation of thrombosis. This study aimed to investigate the effect of exhaustive exercise in the morning and evening on the blood hemostasis in female athletes. Platelets, fibrinogen, and thromboplastin time were measured as indicators of blood coagulation before and after testing. Results: An acute exhausting aerobic training session in both groups significantly increased platelet and fibrinogen levels, but a significant decrease was observed in thromboplastin time. Conclusion: According to the results of this study, the circadian rhythm and acute exhausting aerobic training are effective factors on the blood coagulation and a training session in the morning compared with the evening training has a greater effect on the blood coagulation.
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