A 2023 analysis in the British Journal of Sports Medicine pooled 270 randomized trials with nearly 16,000 participants. All exercise types lowered resting blood pressure, and isometric exercise lowered it the most. The usual study protocol was four 2-minute holds, three days a week.
For decades the standard exercise advice for blood pressure was aerobic: walk, jog, cycle. That advice still stands. A large 2023 analysis added something unexpected, which is that holding still under tension may lower resting blood pressure even more.
What the 2023 analysis looked at
Researchers pooled 270 randomized controlled trials published between 1990 and early 2023, with 15,827 participants in total. Each trial tested an exercise program lasting at least two weeks against a control group and measured resting blood pressure before and after. The analysis was published in the British Journal of Sports Medicine.
The trials were sorted into five types of training:
- Aerobic exercise, such as walking, running and cycling
- Dynamic resistance training, such as weights
- Combined aerobic and resistance training
- High-intensity interval training
- Isometric exercise, where a muscle is held under tension without moving
What it found, by the numbers
Every category lowered resting blood pressure. The average reductions in systolic and diastolic pressure, in mmHg, were:
- Isometric exercise: about 8.2 systolic and 4.0 diastolic
- Combined training: about 6.0 and 2.5
- Dynamic resistance: about 4.6 and 3.0
- Aerobic exercise: about 4.5 and 2.5
- High-intensity intervals: about 4.1 and 2.5
Within those categories, the wall squat, better known as the wall sit, ranked as the most effective single exercise for systolic pressure. Running ranked highest for diastolic pressure.
What an isometric session looks like
Isometric exercise means holding a position. In a wall sit, the back rests flat against a wall and the knees are bent as if sitting on an invisible chair. Nothing moves, and the thigh muscles work the whole time.
The protocol used in many of the isometric trials was short:
- Hold for 2 minutes
- Rest for 1 to 2 minutes
- Repeat for 4 holds in total
- Do this 3 days a week
That adds up to about 15 minutes per session. Some trials used a handgrip device or a seated leg extension instead of a wall sit. The 2017 US blood pressure guideline from the American College of Cardiology and American Heart Association already lists isometric handgrip training among the non-drug approaches with evidence behind it.
The depth of the wall sit sets the difficulty. A higher position with a small knee bend is easier, and a lower position is harder. In the trials, intensity was set for each person so the last hold felt hard but could be finished.
Why holding still might work
The mechanism is not fully settled. The leading explanation is that a sustained contraction squeezes the blood vessels in the working muscle and briefly reduces flow. When the hold ends, blood rushes back in, and repeating that cycle over weeks appears to improve how well the vessels relax. Changes in the nervous system's control of blood pressure may also play a part.
Who should be careful
Isometric exercise raises blood pressure during the hold itself, sometimes sharply. That short-term rise is the main reason for caution.
- Breathing matters. Holding the breath and straining makes the rise larger. In the studies, participants were coached to breathe steadily through each hold.
- High or uncontrolled blood pressure. People with a diagnosis of hypertension, especially if readings are not controlled, should talk with their clinician before trying isometric training.
- Heart or blood vessel conditions. The same applies to people with heart disease, an aneurysm or a history of stroke.
- Knee pain. A wall sit loads the knees. A higher position or a handgrip protocol may suit some people better.
Chest pain, severe headache, dizziness or fainting during exercise needs medical attention.
What this does not mean
It does not mean cardio is out. Aerobic exercise lowered blood pressure too, and it brings benefits for fitness, blood sugar and mood that isometric holds have not been shown to match. Our guides to VO2 max and walking for heart health cover that side.
It also does not mean exercise replaces medication. For someone who has been prescribed blood pressure medicine, any change to that treatment is a decision for the prescribing clinician. Exercise is something to add, not a swap.
The takeaway
A few minutes of isometric holds, three days a week, lowered resting blood pressure in trials by an amount that is meaningful at the population level. It needs no equipment and little time. It works alongside the other basics: regular aerobic activity, less sodium, limited alcohol, enough sleep and knowing your numbers.
Home blood pressure readings and routine bloodwork give a clinician more to work with when building a plan.
This article is educational and is not medical advice. Talk with a licensed clinician before starting a new exercise program, especially with high blood pressure.
References
- Edwards JJ, Deenmamode AHP, Griffiths M, et al. Exercise training and resting blood pressure: a large-scale pairwise and network meta-analysis of randomised controlled trials. Br J Sports Med. 2023;57(20):1317-1326. Source
- Whelton PK, Carey RM, Aronow WS, et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults. J Am Coll Cardiol. 2018;71(19):e127-e248. Source
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