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The effect of time of day and exercise on platelet functions and platelet–neutrophil aggregates in healthy male subjects

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Abstract

Platelet activation state changes by exercise. The effect of exercise time on platelet activation state and formation of platelet–neutrophil aggregates are not known yet. In this study the effect of exercise and time of day were examined on platelet activity with platelet–neutrophil aggregates. Ten moderately active males aged 27± 1.63 (mean±S.D.) years completed sub-maximal (70% VO2max) exercise trials for 30 min. Blood pressure (BP) was recorded. Venous blood samples were obtained at rest, immediately post-exercise and after 30 min of recovery. Whole blood was analysed for haematocrit (Hct), haemoglobin (Hb), platelet count (PC), mean platelet count (MPV) and platelet aggregation (PA). Platelet–neutrophil aggregates and beta-thromboglobulin (β-TG) levels were assayed. Platelet count showed significant increase after morning exercise ((236± 32)×109 l−1 versus (202± 34)×109 l−1 baseline, p < 0.05). Exercise resulted in significantly lower MPV after the evening exercise (9.16± 0.5 fl versus 9.65± 0.36 fl, p < 0.05). Platelet aggregation by adenosine diphosphate (ADP) decreased after morning exercise and the recovery aggregation levels were significantly different at two different times of the day (68± 20% a.m. versus 80± 12% p.m., p < 0.05). It was also showed that platelet–neutrophil aggregates increased significantly from baseline after both exercises. Exercise-induced platelet–neutrophil aggregates were higher in the evening (10.7± 1.3% p.m. versus 6.4± 1.8% a.m., p < 0.0001). It is therefore concluded that besides platelet–platelet aggregation, exercise can cause platelet– neutrophil aggregates. In addition, time of day has an effect on platelet activation related events. Circadian variations of physiological parameters may have an effect on thrombus formation by platelet activation. (Mol Cell Biochem xxx: 119–124, 2005)

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Authors and Affiliations

  1. Department of Medical Biochemistry, Faculty of Medicine, Gazi University, Ankara, Turkey

    Hatice Aldemir & Nedret Kiliç

  2. Department of Medical Biochemistry, Faculty of Medicine, Gazi University, 06510, Beşevler, Ankara, Turkey

    Nedret Kiliç

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  1. Hatice Aldemir
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  2. Nedret Kiliç
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Correspondence to Nedret Kiliç.

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Aldemir, H., Kiliç, N. The effect of time of day and exercise on platelet functions and platelet–neutrophil aggregates in healthy male subjects. Mol Cell Biochem 280, 119–124 (2005). https://doi.org/10.1007/s11010-005-8238-8

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