There are a number of reasons that you may experience dizziness or light-headedness from time to time ranging from getting up from a seated position to quickly to more serious illnesses. You can find more information here: nlm.nih.gov/medlineplus/ency/article/003....
Quick Tip: If you have a slow pulse (50 or less) and experience dizziness when standing up try getting up more slowly and see if that solves the problem. Chronic endurance exercise training: a condition of inadequate blood pressure regulation and reduced tolerance to LBNP. Med Sci Sports Exerc.
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