Acute vigorous exercise primes enhanced NO release in human platelets.
Natsuko Kasuya1, Yukio Kishi, Shin-ya Sakita
1Department of Cardiovascular Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8519, Japan.
Atherosclerosis
|March 8, 2002
Summary
Acute exercise enhances nitric oxide (NO) release from platelets, potentially protecting against excessive platelet activation. This study investigated exercise effects on platelet NO production and calcium levels.
Area of Science:
- Cardiovascular Physiology
- Exercise Science
- Platelet Biology
Background:
- Platelet activation increases with strenuous exercise, indicated by elevated intracellular calcium.
- Direct evidence on how acute exercise impacts platelet-derived nitric oxide (NO) is limited.
Purpose of the Study:
- To investigate the effect of acute strenuous exercise on nitric oxide (NO) release from human platelets.
- To examine the relationship between exercise-induced changes in platelet NO production, intracellular calcium, and aggregation.
Main Methods:
- Healthy male subjects underwent a symptom-limited treadmill test.
- Washed platelets were analyzed for NO release, intracellular calcium levels, and aggregation before and after exercise.
- Nitric oxide was measured using a NO-selective microelectrode.
Main Results:
- A significant increase in NO release from platelets was observed post-exercise at low collagen doses, without affecting aggregation.
- Platelet intracellular calcium levels ([Ca2+]i) were elevated after exercise.
- Both NO release and aggregation were modestly enhanced at higher collagen doses post-exercise.
Conclusions:
- Acute strenuous exercise enhances platelet nitric oxide (NO) release in healthy individuals.
- This enhanced NO production may play a protective role against exercise-induced platelet activation.
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