One workout lowers blood pressure for hours, and a habit protects your heart

Key takeaways

• In people with high blood pressure, one session of aerobic exercise lowers it about 5 to 7 points, and the drop can last up to 24 hours, the American College of Sports Medicine says².
• Working muscles can take sugar out of the blood whether or not insulin is available, and a workout can keep blood sugar lower for 24 hours or more¹.
• Across 47 trials in type 2 diabetes, structured exercise lowered A1C by 0.67 percentage points, while advice to be active, without diet advice, didn’t help⁴.
• Since 2010, Medicare has covered intensive cardiac rehab programs built on low-fat eating, exercise and practices such as yoga and meditation, for up to 72 sessions¹⁰¹¹¹².
• Call 911 for chest discomfort, pain in the arms, back, neck or jaw, shortness of breath or a cold sweat, during exercise or any time¹⁵.

Take a brisk walk, and your working leg muscles start pulling sugar out of your blood. They can do it whether or not insulin is available, the American Diabetes Association (ADA) explains¹. The effect can keep blood sugar lower for 24 hours or more¹.

Blood pressure follows a similar script. For people with high blood pressure, one session of aerobic exercise lowers it about 5 to 7 points, and the dip can last up to a day, according to the American College of Sports Medicine (ACSM)².

Then the effects fade. That’s the key to how activity works for the heart and metabolism. Each workout is a short-acting dose, and the habit is what keeps the benefit going.

The heart’s own risk follows the same rule. A hard effort briefly raises the chance of a heart attack, and that short-term risk is greatest in people who are least active⁷. Regular movement shrinks it. So does the rehab many heart patients skip.

Each workout is a short-acting dose for blood pressure

Doctors call the dip after a workout post-exercise hypotension. A 2009 position statement from the Australian Association for Exercise and Sports Science says a single bout can keep pressure lower for much of the waking day³.

Training adds up to a lasting change. The ACSM puts the drop in resting systolic pressure, the top number, at about 5 to 7 points with regular aerobic exercise in people with hypertension². Dynamic strength training lowers it about 2 to 3 points, though one pooled analysis found it about as effective as aerobic work².

Our blood pressure habits article explains how a few points add up and how the 2025 guideline grades each habit.

The ACSM’s prescription for people with high blood pressure²:

• Aerobic: 5 to 7 days a week, at moderate effort, about 11 to 14 on a 6-to-20 effort scale.
• Time: 30 to 60 minutes a day, in one stretch or added up across the day.
• Strength: 2 to 3 days a week, 2 to 4 sets of 8 to 12 repetitions for each major muscle group.
• Breathing: never hold your breath while lifting, which can send pressure very high.

Notice the “most days” part. Because one session’s effect lasts up to about a day, the ACSM points to it as the reason to exercise on most days².

Muscles pull sugar from your blood without waiting for insulin

Normally, insulin works like a key that lets sugar into your cells. Exercise opens a second door. When muscles contract, they can take up glucose and burn it for energy whether insulin is around or not, the ADA says¹. During and after activity, they also use whatever insulin is available more efficiently¹.

That matters most for people whose insulin works poorly, as in type 2 diabetes.

The best-known summary of the trials appeared in JAMA in 2011. Daniel Umpierre and colleagues pooled 47 randomized trials, studies that assign people by chance to one group or another, covering 8,538 people with type 2 diabetes⁴. Each lasted at least 12 weeks⁴.

Approach	Drop in A1C, percentage points
Structured exercise, all types	0.674
Aerobic training	0.734
Strength training	0.574
Both combined	0.514
More than 150 minutes a week	0.894
150 minutes a week or less	0.364
Advice to be active, plus diet advice	0.584
Advice to be active, alone	No significant change4

A1C is a blood test that reflects average blood sugar over recent months. By our math, a 0.67-point drop would take someone from 8.0% to about 7.3%. The trials varied a lot, so your own result could be larger or smaller⁴.

The surprise is the last row. Being told to exercise didn’t move A1C on its own; structured programs did⁴.

The ADA’s 2026 Standards of Care turn this into targets for adults with type 2 diabetes⁵:

• at least 150 minutes a week of moderate to vigorous aerobic activity, spread over at least 3 days, with no more than 2 days in a row off;
• strength training 2 to 3 times a week, on days that aren’t back to back;
• getting up from prolonged sitting at least every 30 minutes;
• for older adults, flexibility and balance work 2 to 3 times a week.

Our sitting article covers ways to break up long stretches.

A hard effort strains an unready heart, but a habit shrinks the risk

In 2007, an American Heart Association (AHA) scientific statement reviewed exercise and sudden heart events⁷. Regular activity lowers coronary heart disease events, it found. But vigorous effort can briefly raise the risk of a heart attack or sudden cardiac death in people who are susceptible⁷.

That risk falls hardest on people who are least active, often during unaccustomed effort⁷. Most of these events happen in people with an underlying heart problem, such as clogged arteries in adults⁷. Our article on starting exercise after inactivity covers the famous 1993 study that measured this hour by hour.

The AHA updated its review in 2020, drawing on more than 300 studies⁸. People who stayed active, walkers included, were up to 50% less likely to have a heart attack or die suddenly of a heart problem⁸. The danger clustered at the extremes. In marathons and half-marathons, half of the cardiac events came in the last mile, and first-timers accounted for nearly 40% of the events in triathlons⁸.

“Exercise is medicine,” said Barry Franklin, who chaired the statement, adding that “like medicine, it is possible to underdose and overdose on exercise”⁸.

Our summary of the AHA’s advice for building up safely⁸:

1. Begin small, with 5- or 10-minute sessions, and add time a little at a time.
2. Bookend each session: a few easy minutes of the same activity first, and a slow walk at the end.
3. Stick to flat routes for the first 6 to 8 weeks. If you’ve had no symptoms, then add hills or jogging.
4. Back off when the air is very humid or you’re at an altitude you aren’t used to.

Squeezing it all into weekends? Our consistency and weekly-target articles cover that pattern.

Cardiac rehab: Medicare covers the exercise, and even the yoga

Cardiac rehabilitation is a supervised program of exercise, education and counseling after a heart problem. Medicare covers it after a heart attack within the past year, bypass surgery, stable angina, valve repair or replacement, angioplasty or a stent, a heart or heart-lung transplant, or for stable chronic heart failure¹⁰¹¹. Federal rules define that last one as a weak pump, pushing out 35% or less of the blood in its main chamber with each beat, with symptoms despite at least six weeks of optimal treatment¹¹. A doctor must refer you¹⁰.

Standard rehab covers up to 36 one-hour sessions, up to two a day, with 36 more if medically necessary¹⁰. In 2026, you pay 20% coinsurance after the $283 Part B deductible¹⁰.

A 2016 review in American Family Physician describes a study of more than 600,000 Medicare patients hospitalized for acute coronary syndromes, such as heart attacks. Those who attended 25 or more rehab sessions had a 2.2% death rate at one year, versus 5.3% for those who attended 1 to 24⁹. By our math, that’s about 3 fewer deaths per 100 people. People who attend more may also be healthier, so this is a link, not proof.

Many people never get the referral. In one study of 172,817 hospital discharges, only 56% of eligible patients were referred, and a review found women referred less often than men, 38.5% versus 45%⁹. Our article on trainers and physical therapists covers national participation rates and a 2026 review of rehab trials.

Intensive rehab: diet, exercise and stress practices in one program

Since 2010, Medicare has also covered intensive cardiac rehab, up to 72 one-hour sessions over 18 weeks, as many as six a day¹⁰¹¹¹². Three programs have won approval¹²¹³¹⁴:

Program	Approved	What it involves	What the evidence looks like
Dr. Ornish’s Program for Reversing Heart Disease	August 2010	Low-fat, whole-food vegetarian diet with about 10% of calories from fat, at least 3 hours of exercise a week, about an hour a day of stress management such as restorative yoga and meditation, group support12	A 48-person trial showed artery narrowing shrank slightly in a year while controls worsened; a 333-person project found no significant difference in heart attacks, strokes or deaths12
Pritikin Program	August 2010	About 10% to 15% of calories from fat and 65% to 75% from complex carbohydrates, daily 45- to 60-minute treadmill walks, daily education13	Mostly studies without comparison groups13
Benson-Henry Institute Cardiac Wellness Program	May 2014	Supervised exercise, counseling and behavioral training, including the relaxation response in studies CMS reviewed14	In Medicare claims, 3-year death rates were 6.2% versus about 10.5% to 11% in comparison groups, a difference that could have been chance14

To qualify, a program must show peer-reviewed evidence that it slowed heart disease or cut the need for bypass or stents¹¹. It must also show significant drops in at least five of six measures, such as LDL cholesterol, both blood pressure numbers and the need for medicines¹¹¹².

Still, the trials behind these programs were small or uncontrolled, and the Benson-Henry studies were 87% to 94% white¹²¹³¹⁴. Since February 2018, federal rules have also covered intensive rehab for stable chronic heart failure¹¹. At least one consumer guide still lists it as excluded¹⁰, so ask the program directly.

The activity plan by situation

This is our own summary of the guidance above, to discuss with your clinician.

Your situation	What to do	How much	Safety notes
High blood pressure	Brisk walking, cycling or swimming, plus strength work2	Aerobic 5 to 7 days, 30 to 60 minutes a day in any size pieces; strength 2 to 3 days2	A 2009 Australian exercise-science statement says to postpone and see your doctor promptly if resting pressure is 180/110 or higher3; don’t hold your breath while lifting2; cool down gradually3
Prediabetes or type 2 diabetes	Aerobic and strength training; stand up often5	At least 150 minutes over 3 or more days, no more than 2 days off; strength 2 to 3 days; break sitting every 30 minutes5	If you use insulin or pills that boost insulin, check glucose before; at 100 mg/dL or lower, eat 15 to 20 grams of carbs first1
Type 1 diabetes	Activity you enjoy, with a plan from your care team56	Same weekly targets as adults, as you’re able5	If glucose is high, check ketones; if they’re positive, skip vigorous activity; carry fast-acting carbs6
After a heart attack, stent, bypass or valve surgery	Ask for a cardiac rehab referral10	Up to 36 sessions; intensive rehab up to 7210	Get medical approval before starting a program on your own8
Stable chronic heart failure	Ask about standard or intensive cardiac rehab1011	Up to 36 sessions; intensive up to 7211	Coverage requires a weak pump (35% or less) with symptoms despite at least 6 weeks of treatment11
Leg pain when walking that eases with rest	Ask a clinician whether narrowed leg arteries are the cause	A companion article on circulation covers testing and walking programs	Don’t just push through new symptoms
Older adult with diabetes or high blood pressure	Add balance and flexibility work5	2 to 3 times a week5	Take a longer cool-down; drink fluids if you take a water pill3

When to stop, and when to call 911

Stop and get checked if you feel lightheaded, short of breath or have chest pain or pressure during exercise, the AHA advises⁸. Palpitations also deserve a medical look³.

Blood pressure medicines change how exercise feels. Beta-blockers slow your heart rate during effort, so judge intensity by how hard it feels, and they make heat harder to handle³. Water pills lower body fluid, especially in the first weeks, so drink enough³. With some blood pressure drugs, stopping exercise abruptly can make pressure drop sharply, so slow down gradually³.

Diabetes medicines can cause lows. If you use insulin or pills that make your pancreas release more insulin, the ADA advises¹:

1. Check your glucose before activity.
2. At 100 mg/dL or lower, have 15 to 20 grams of carbohydrate, such as 4 glucose tablets or 4 ounces of juice.
3. Recheck in 15 minutes, and repeat until you’re above 100 before you start.
4. Watch for lows long after a workout, too, especially after long or hard sessions.

If you get frequent lows or highs, your care team may adjust your insulin or meal plan⁶. Make medicine changes with them, never on your own. The same goes for blood pressure pills: if your home readings drop as you get fitter, share them with your clinician.

What the evidence shows

Claim	Evidence rating	What it rests on
Regular aerobic exercise lowers blood pressure in hypertension	Strong evidence	About 5 to 7 points systolic, per ACSM23
One session lowers blood pressure for hours	Strong evidence	ACSM and Australian position statements23
Structured exercise lowers A1C in type 2 diabetes	Strong evidence	47 randomized trials4
Advice alone, without structure or diet advice, lowers A1C	Evidence says no, or unsafe	No significant change in pooled trials4
Regular activity lowers heart attack and sudden death risk	Strong evidence	AHA reviews of more than 300 studies, mostly observational78
More cardiac rehab sessions are linked to fewer deaths after heart events	Strong evidence	A Medicare cohort of more than 600,000 patients, observational; Cochrane reviews9
Intensive lifestyle rehab programs reverse heart disease	Promising but early	Small or uncontrolled studies reviewed by Medicare121314

Movement is medicine you make yourself

Natural-health traditions have long held that the body heals when given the right conditions. The exercise evidence points the same way: the body answers what you ask of it, one day at a time.

Medicare’s intensive rehab programs make the point from inside the system. A federal insurer covers programs built on vegetarian eating, daily walks, meditation and group support for people with qualifying heart conditions¹¹¹²¹³. That’s lifestyle treated as treatment, with testing and supervision alongside it.

Self-reliance matters, and so does structure. In the diabetes trials, advice alone did little, while organized programs worked⁴. Find a class, a walking partner or a rehab team.

Questions readers ask

The bottom line

Every bout of activity lowers blood pressure and blood sugar for hours, and those effects fade within a day or so. That’s one reason to move on most days, and why the habit, not the single workout, protects your heart.

If you’ve had a heart event, ask for cardiac rehab before you leave the hospital. If you take insulin or blood pressure pills, plan exercise with your care team. And if chest discomfort, breathlessness or a cold sweat strikes, stop and call 911.

Related reading

• The first 10 minutes of exercise pay off most, so start slower than you think
• A trainer coaches your squat while a physical therapist treats what hurts
• Exercise benefits start below 150 minutes and keep rising well past it
• Your heart counts the weekly total while your habits count the repeats
• Most of your sodium is added before food reaches your kitchen

Sources

1. American Diabetes Association. “Understanding Blood Glucose and Exercise.” diabetes.org, accessed October 2026. diabetes.org
2. Zaleski A. “Exercise for the Prevention and Treatment of Hypertension – Implications and Application.” American College of Sports Medicine, February 27, 2019, updated July 25, 2025. acsm.org
3. Sharman JE, Stowasser M. “Australian Association for Exercise and Sports Science Position Statement on Exercise and Hypertension.” Journal of Science and Medicine in Sport, 2009;12:252–257 (hosted by Sports Medicine Australia). sma.org.au
4. Umpierre D, Ribeiro PAB, Kramer CK, et al. “Physical Activity Advice Only or Structured Exercise Training and Association With HbA1c Levels in Type 2 Diabetes: A Systematic Review and Meta-analysis.” JAMA, 2011;305(17):1790–1799. jamanetwork.com
5. American Diabetes Association. “Standards of Care in Diabetes—2026,” Section 5, physical activity recommendations (as reproduced by Guideline Central). guidelinecentral.com
6. American Diabetes Association. “Exercise & Type 1.” diabetes.org, accessed October 2026. diabetes.org
7. Thompson PD, Franklin BA, Balady GJ, et al. “Exercise and Acute Cardiovascular Events: Placing the Risks Into Perspective.” American Heart Association scientific statement, Medicine & Science in Sports & Exercise, 2007;39(5):886–897 (UT Southwestern research record). utsouthwestern.elsevierpure.com
8. American Heart Association. “Slow, Steady Increase in Exercise Intensity Is Best for Heart Health — Much More Is Not Always Much Better” (on Franklin BA, et al., Circulation, 2020). News release, February 26, 2020. newsroom.heart.org
9. Servey JT, Stephens M. “Cardiac Rehabilitation: Improving Function and Reducing Risk.” American Family Physician, 2016;94(1):37–43. aafp.org
10. Medicare Rights Center. “Cardiac Rehabilitation Programs.” Medicare Interactive, updated April 2, 2025 (2026 cost figures). medicareinteractive.org
11. Code of Federal Regulations. 42 CFR 410.49, “Cardiac Rehabilitation Program and Intensive Cardiac Rehabilitation Program: Conditions of Coverage” (via Cornell Law School Legal Information Institute), accessed October 2026. law.cornell.edu
12. Centers for Medicare & Medicaid Services. “Decision Memo for Intensive Cardiac Rehabilitation (ICR) Program – Dr. Ornish’s Program for Reversing Heart Disease (CAG-00419N).” August 12, 2010. cms.gov
13. Centers for Medicare & Medicaid Services. “Decision Memo for Intensive Cardiac Rehabilitation (ICR) Program – Pritikin Program (CAG-00418N).” August 12, 2010. cms.gov
14. Centers for Medicare & Medicaid Services. “Decision Memo for Intensive Cardiac Rehabilitation (ICR) Program – Benson-Henry Institute Cardiac Wellness Program (CAG-00434N).” May 6, 2014. cms.gov
15. American Heart Association. “Warning Signs of a Heart Attack.” heart.org, last reviewed December 12, 2024. heart.org