Blood pressure naturally increases with age. For a man in his forties to fifties, the ideal blood pressure depends on his health condition and the activities he was involved in prior to having a blood pressure reading. In general, the average man's blood pressure is the lowest when he wakes up and the highest when he engages in physical activity.
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Optimal Blood Preasure
As a rule of thumb, an adult's resting blood pressure should be less than 120 over 80. If a 48-year-old man is performing exercise that increases the heart rate, it is natural for the systolic pressure, the top number, to increase as his heart works harder. At the same time, the diastolic pressure, which is recorded as the bottom number, should stay about the same. While it's optimal to have normal blood pressure, conditions such as heart disease, cancer and type II diabetes can have effects that include lowering or raising blood pressure.
Blood Pressure Risks
A 48-year-old man may notice signs and symptoms of high blood pressure. If you experience dizziness, headaches, blurred vision, prolonged nosebleeds or any prolonged blood pressure readings greater than 140 over 90, seek evaluation by a health professional. Your doctor can determine whether you're at risk for high blood pressure and develop an appropriate plan for prevention or treatment.