Abstract
The objective of the study was to determine the effects of acute high-intensity interval training (HIIT) on hematological parameters in sedentary men. Ten healthy, non-smoker, and sedentary men aged between 18 and 24 years participated in the study. All subjects performed four Wingate tests with 4 min intervals between the tests. Blood samples were collected at pre-exercise, immediately after, 3 and 6 h after the fourth Wingate test. Hematological parameters were analyzed in these samples. The results showed that hematocrit percentage, hemoglobin values, red cell count, mean cell volume, platelet count, total white cell count, and counts of the white cell subgroups increased immediately after the acute HIIT and their values began to return to resting levels 3 h after exercise, and completely returned to resting levels 6 h after exercise. In conclusion, acute HIIT causes an inflammatory response in blood.
Highlights
It is generally known that both acute and chronic exercises induce several hematological changes in humans [1]
It has been generally shown that acute submaximal exercise increases the number of erythrocytes, leucocytes and platelets, hematocrit values and hemoglobin concentrations significantly as compared to pre-exercise values and these increments depend on plasma losses caused by the exercise [4]
Studies [7,8] showed that these changes in hematological parameters occur immediately after exercise; whereas, it returns to resting levels within 24 h following exercise
Summary
It is generally known that both acute and chronic exercises induce several hematological changes in humans [1]. It has been ascertained that exercise-induced hematological changes are dependent on the type, intensity and duration of exercise. Several factors such as training status, gender, age, environmental conditions and nutritional status of the subjects play an important role [1]. It is asserted that short-time exercise performed until exhaustion increases the number of leukocytes and this situation cannot be explained by the hemoconcentration mechanism alone. It can be associated with metabolic changes such as ischemia that occur during exercise and increased muscle activity leads to a greater incidence of capillary swelling and leukocyte adherence to venules [5]. Studies [7,8] showed that these changes in hematological parameters occur immediately after exercise; whereas, it returns to resting levels within 24 h following exercise
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