Ryan Worthington Vitality & Mind

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DOES CARDIO KILL YOUR GAINS? NOT IF YOU PROGRAM IT RIGHT

I just wrote a new NSCA journal article reviewing the research on concurrent training (strength + cardio) and the so-called interference effect.

Short version: The interference effect is real, but often wildly overstated.

Here are the practical takeaways for trainers and coaches:

1️⃣ Hypertrophy is pretty resilient

- Moderate cardio after lifting (≤30 min) has little to no meaningful impact on muscle growth
- Cycling, incline walking > running
- Biggest issues show up only with high volumes or long durations

2️⃣ Strength interference is usually small

- Lift before cardio when done in the same session
- 20–30 min of moderate cardio rarely hurts strength gains
- Problems mainly occur with high-frequency endurance work or poor recovery
- If strength is the top priority → separate sessions by ≥6 hours

3️⃣ Power is the most sensitive

- Power (jumping, sprinting, RFD) is affected more by fatigue than muscle loss
- Keep post-lift cardio short (15–20 min) and low–moderate intensity
- Ideally separate power training and cardio by ~24 hours

4️⃣ Scheduling matters more than avoidance

Best → Worst:

1. Separate days
2. Same day, ≥6–8 hours apart
3. Same session, lift before cardio
4. Same session, cardio before lifting

BOTTOM LINE:

The interference effect is context-dependent, not automatic. With smart sequencing, reasonable cardio doses, and clear priorities, athletes can build strength, muscle, and endurance at the same time—without sacrificing results.

Train smarter, not more scared of cardio 💪