Physical inactivity, obesity, high sodium intake, low potassium intake, heavy alcohol consumption, high cholesterol and psychosocial stress have all been associated with high blood pressure. As exercise can help modify several of these factors, it can in turn help reduce hypertension.
Blood pressure is defined as the amount of pressure exerted by the blood on blood vessel walls as it moves through the vessel. There are two measurements taken when finding blood pressure: the systolic blood pressure (SBP), which is the highest pressure on the walls immediately after a single heartbeat and the diastolic blood pressure (DBP), which is the lowest pressure on the walls immediately before the heartbeat.
When a SBP 140 mm Hg and/or DBP 90 mm Hg it is known as hypertension. In practical terms, this means that the heart is doing extra work in order to pump blood through a persons body. If you have hypertension, you are at a greater risk for cardiovascular diseases such as stroke, heart failure, angina, renal failure, and myocardial infarction (heart attack).
Exercise training can lower both cardiac output and peripheral vascular resistance at rest and at any given level of work. Lowered cardiac output is primarily due to reduced heart rate. All these help to reduce the amount of work needed for the heart to pump blood, thereby decreasing both resting SBP and DBP. Even exercises of moderate intensity can induce these beneficial changes.
The exercise recommendations for those with mild hypertension are generally the same as those for healthy adults. Endurance, or aerobic, exercises are shown to provide greater benefits and should normally be performed at a frequency of 3-5 days/week for a duration of 20-60 minutes at 60-85% of one¡¯s maximum heart rate. However, for those with severe hypertension or particularly elevated blood pressure, the intensity should be lowered to about 50-70% of ones maximum heart rate.
People with hypertension should exercise cautiously when performing all types of weight lifting. Lifting heavy weights occasionally inspires breath holding and an increase in intra-abdominal pressure resulting in a subsequent sharp rise in blood pressure. This is a dangerous activity for anyone, but is particularly so for someone whose blood pressure is already elevated. Therefore, perform all weight training activities with low weights and high repetitions and concentrate on even, regular breathing. Also, be sure to contact your doctor before starting an exercise program.
Karp Rehabilitation is an active rehabilitation program specializing with soft-tissue injury rehabilitation. For more information call 604.420.7800.