Training After a Heart Attack: How to Come Back Without Overdoing It

A concrete plan for training after a heart attack: walking minutes week by week, when to add weights, how to gauge effort, and when to stop immediately.

A heart attack does not mean you are done training, but it does mean that for the next few months you train by someone else's rules. Supervised exercise after a heart attack is one of the few measures that genuinely lowers the risk of another cardiac event — but only if the dose is right, neither too small nor too big. Here is what that dose looks like in minutes, beats and kilograms.

Cardiac rehab is the starting point, not an option

Before any self-made plan comes an exercise stress test, usually 2 to 6 weeks after hospital discharge. That test gives you two things you need: an upper heart-rate limit that is safe for you, and information on whether effort produces ECG changes. Structured cardiac rehabilitation programmes run 8 to 12 weeks with 2 to 3 supervised sessions per week, and that is the best-spent time of your first year.

If no such programme exists where you live, ask your cardiologist for a written prescription with three numbers: your maximum training heart rate, the allowed intensity range, and the date of your next check-up. Without those three numbers, any plan is guesswork.

How to gauge effort when heart rate lies

Most people take a beta blocker after a heart attack, and it pulls heart rate down by roughly 10 to 30 beats per minute. So do not trust the watch alone.

Borg scale (6-20): for the first 6 to 8 weeks stay at 11-13, meaning light to somewhat hard.
Talk test: you must be able to say a full 8 to 10 word sentence without gasping.
Heart rate: if you have stress test results, start at 40-60% of heart rate reserve, then move toward 70% after 8 to 12 weeks.

The first six weeks: walking is the training

Weeks 1-2: twice a day, 10 minutes each, flat ground, the pace you would use walking to the shop, about 4 km/h.
Weeks 3-4: once a day, 20 to 25 minutes, five days a week.
Weeks 5-6: 30 minutes, five days a week, adding a little pace rather than more length.

Every session gets 5 minutes of warm-up and 5 minutes of cool-down. Stopping abruptly after effort drops your blood pressure and is the most common cause of dizziness at this stage. The target by the end of month three is 150 minutes of moderate activity per week — roughly 30 minutes, five times.

When strength work comes in

After an uncomplicated heart attack with no surgery, resistance training is usually added 4 to 6 weeks after the event, and only once walking is already steady. If your breastbone was cut for surgery, do not push, pull or lift anything heavier than 5 kilograms for the first 8 to 12 weeks, no matter how good you feel — bone heals on its own schedule, not yours.

The starting protocol looks like this:

8 to 10 whole-body exercises, one set of 10 to 15 reps each
load around 30 to 40% of estimated max: a weight you could do 20 reps with, but you stop at 12
2 to 3 sessions per week with at least one rest day between them
60 to 90 seconds of rest between sets
add 2 to 5% weight only when 15 reps feel like Borg 12

Breathing matters more than the load here: exhale on the push or the lift, never hold your breath. A Valsalva manoeuvre can spike systolic pressure by 100 mmHg, and it is the one thing in the gym that can genuinely cost you.

What not to do in the first months

Sets to failure and one-rep max attempts.
High-intensity intervals without explicit cardiology approval; when cleared, start with 4 intervals of 1 minute.
Training above 30 °C or below -5 °C.
Sauna, hot showers and alcohol in the first two hours after a session.
Static loaded holds such as farmer's carries lasting more than 30 seconds in the early weeks.

Signs to stop the session immediately

Stop and sit down if you get chest pressure, tightness or burning, pain spreading into the left arm, neck or jaw, breathlessness out of proportion to the effort, cold sweat, nausea, dizziness, or irregular beats. If the symptom does not clear within 5 minutes of rest, it is no longer a training question.

When to see a doctor

Emergency services immediately if chest pain lasts longer than 5 minutes at rest, does not settle after two doses of nitroglycerin taken 5 minutes apart, or if you have a blackout, sudden severe breathlessness, or a pounding rhythm that will not stop.

Book an appointment within a few days if you notice: a 2 kg weight gain over 3 days with ankle swelling, resting heart rate persistently above 100, resting blood pressure persistently above 140/90, breathlessness when lying flat, or a drop in exercise tolerance — the same walk that was easy last week suddenly is not.

You also see the doctor before doubling your training volume or adding intervals on your own. A check-up every 3 to 6 months during the first year is a sensible schedule.

Small things that actually pay off

Salt: aim below 2000 mg of sodium per day, about 5 grams of table salt.
Protein: 1.2 to 1.6 g per kilogram of body weight, so muscle does not drain away while training volume is low.
Weigh yourself every morning after the toilet and write it down — fluid retention shows on the scale before it shows in your legs.
Sleep 7 to 8 hours; chronically short sleep raises blood pressure and resting heart rate.
Cigarettes: zero. Nothing else you do in the first year comes close in effect.

The short version

Do not start alone: a stress test and an 8 to 12 week rehab programme, 2-3 sessions a week, come first.
The first 6 weeks are walking, from 2 x 10 minutes up to 30 minutes five days a week, targeting 150 minutes weekly.
Keep effort at Borg 11-13; a beta blocker cuts heart rate by 10-30 beats, so the watch alone is not reliable.
Strength after 4-6 weeks: 8-10 exercises, 1 set of 10-15 reps, 30-40% of max, no breath holding. After sternotomy, nothing over 5 kg for 8-12 weeks.
Chest pain over 5 minutes at rest, fainting, or +2 kg in 3 days with swollen legs means a doctor, not a rest day.