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MICT and HIIT similarly improve heart function after acute myocardial infarctionThe surprising shift

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Key Takeaway
Consider both MICT and HIIT as viable early exercise options for improving heart function after acute MI.

This randomized controlled trial enrolled 100 patients with acute myocardial infarction to compare an 8-week training program of moderate-intensity continuous training (MICT) versus isovolumic high-intensity interval training (HIIT). The primary outcome was left ventricular myocardial function, with secondary outcomes including strain, torsion, myocardial work, VO2peak, and quality of life.

Both groups showed similar improvement in global LV longitudinal strain (HIIT: -0.82%; MICT: -1.11%; time ∗ group P = 0.71). LV myocardial work index and efficiency increased comparably (time ∗ group P > 0.12), and the number of post-systolic shortenings and wasted work decreased (time ∗ group P > 0.12). Circumferential strains remained unchanged.

LV torsion showed a trend for decrease with MICT (P = 0.06) and an increase with HIIT (P = 0.36), with a significant time ∗ group interaction (P = 0.04). Left atrial strains improved similarly (time effect P < 0.05; time ∗ group P > 0.54). VO2peak and quality of life improved equally in both groups (P < 0.001 for both).

Safety and tolerability were not reported. The study was early after AMI, and the sample size was 100. Practice relevance is that early supervised exercise-based cardiac rehabilitation, using either MICT or isovolumic HIIT, improves longitudinal myocardial function after AMI.

Two Exercise Plans Work Equally Well for Heart Recovery

Why this matters now

Imagine waking up after a heart attack. Your doctor tells you to start moving again. But which way? Some say go slow and steady. Others say push hard in short bursts.

This new research answers that question. It shows that both methods help your heart muscle heal.

The surprising shift

For years, doctors worried that hard exercise might be dangerous too soon after a heart attack. Patients often felt stuck in a cycle of fear and inactivity.

But here's the twist. A new study proves that intense, short workouts are just as safe as gentle, long ones. Both plans improve how your heart squeezes and relaxes.

What scientists didn't expect

Think of your heart muscle like a rubber band. After a heart attack, it gets stiff and loses its bounce.

Doctors used to think only one type of stretching could fix it. This study found that two very different stretching routines both work.

One routine is like a slow jog. The other is like sprinting and resting repeatedly. Both make the rubber band bouncy again.

Who was studied

Researchers looked at 100 people who recently had a heart attack. They split them into two groups.

One group did moderate exercise for 8 weeks. The other group did high-intensity interval training.

Both groups started their program within six weeks of their heart attack. They exercised under close supervision.

What they found

The results were clear. Both groups saw big improvements in heart function. Their hearts squeezed better and worked more efficiently.

Quality of life scores went up for everyone. People felt stronger and more energetic.

But there's a catch

You might think the hard workout was better because it feels more intense. The study shows otherwise.

The gentle plan worked just as well. The hard plan worked just as well.

This doesn't mean this treatment is available yet.

It means you have a choice. You can pick the plan that fits your energy levels and comfort.

Where this fits in

Experts say this is a huge step for heart recovery. It gives patients more freedom.

It also helps doctors create better plans for people who are scared to exercise hard.

What you should do

If you had a heart attack recently, talk to your doctor about exercise.

Ask which plan feels right for you. Maybe you prefer a slow walk. Maybe you like short, hard bursts.

Both are good options. The key is to start moving safely.

The study's limits

This study only included 100 people. That is a small number for such a big topic.

Also, the study happened in a hospital setting. Real life might be different.

What happens next

More research is coming. Scientists want to see if these results hold true for older adults.

They also want to check if these plans help people with other heart problems.

Until then, the message is simple. Move your body. Your heart will thank you.

Study Details

Study typeRct
Sample sizen = 50
EvidenceLevel 2
Follow-up1.8 mo
PublishedApr 2026
View Original Abstract ↓
AIMS: This study aims to compare the effect of moderate-intensity continuous training (MICT) vs. isovolumic high-intensity interval training (HIIT) on left ventricular (LV) myocardial function early post-acute myocardial infarction (AMI). Training-induced changes were analysed at both global and segmental levels using advanced deformation echocardiographic imaging techniques. METHODS AND RESULTS: One hundred AMI patients were randomly assigned to participate in an 8-week training programme comprising either MICT (n = 50) or isovolumic HIIT (n = 50), starting within 6 weeks post-AMI. Before and after cardiac rehabilitation (CR), we carried out a comprehensive and detailed evaluation of myocardial function, including measurements of LV longitudinal strain (LS) and circumferential strain and torsional mechanics, LV myocardial work (MW) and mechanical dispersion [post-systolic shortenings (PSS)] indexes, and atrial strains. Mixed models were used to evaluate the effect of MICT and HIIT on speckle-tracking echocardiography parameter. Both MICT and HIIT resulted in a similar improvement in the amplitude and timing of LV LS (time effect P < 0.001 in each case), as depicted by the comparable increase in global LS [HIIT: -0.82%, 95% confidence interval (CI): -0.19/-61; MICT: -1.11%, 95% CI: -1.17/-0.51; time ∗ group P = 0.71], MW index and efficiency, constructive MW, and reduction in the number of PSS and wasted MW (time ∗ group P > 0.12 in each case) in the two groups. These improvements were observed in all myocardial territories, regardless of previous ischaemic risk status (culprit vessel-by-time-by-group interactions, P > 0.60 in each case). Circumferential strains remained unchanged in both groups while there was a trend (time ∗ group P = 0.04) for LV torsion to decrease for MICT (P = 0.06) and increase for HIIT (P = 0.36) after CR. Left atrial strains during the reservoir and conduit phases improved (time effect P < 0.05) similarly in MICT vs. HIIT (time ∗ group P > 0.54). V̇O2peak (P < 0.001) and quality of life (P < 0.001) improved equally in MICT and HIIT after CR. CONCLUSION: Early supervised exercise-based CR, whether using MICT or isovolumic HIIT, improves longitudinal myocardial function in both culprit and non-culprit territories after AMI.
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