Platelet size does not change in the thrombocytosis of prolonged exercise.
Strenuous exercise commonly causes thrombocytosis but there is dispute as to whether the mean platelet volume (MPV) also increases. In this study 91 trained runners had full blood counts measured before and after running races of 10-26.2 miles. There was no significant change in the MPV which was 9.6±0.8 fl at rest and 9.7±0.8 after the race. There were no significant changes in the size/frequency distribution curves.
Orsett Hospital, Grays, Essex, RM16 3EV, UK.
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