Mythbuster
Cardio Training Destroys Muscle Growth (Interference Effect).
Summary
Moderate endurance training – especially cycling or step-based – barely impairs muscle growth; the interference effect occurs mainly with very high volume, excessive running, or directly consecutive intense sessions. With smart dosing, sequencing, and recovery, strength and endurance can be combined well.
Mythbuster: Cardio Training Destroys Muscle Growth (Interference Effect).
The Myth
Cardio training destroys muscle growth (interference effect).
What the Evidence Says
Moderate amounts of endurance training (especially cycling- or step-based) barely impair muscle growth. The interference effect occurs primarily with extremely high volume, excessive running training, or directly consecutive intense sessions.
Practice: Concrete Implementation
The interference effect is not a reason to cut cardio – it is a reason to dose and place cardio. The evidence (including Schumann et al. 2022) shows: moderate amounts of endurance training, especially cycling- or step-based, barely impair muscle growth. It becomes critical with very high volume, excessive running training, and directly consecutive intense sessions.
Example A — Weekly Plan (Strength + Cardio Combined)
Goal: Prioritize muscle growth, endurance as a supplement.
| Day | Session | Details |
|---|---|---|
| Mon | Strength (Lower Body) | 4–6 exercises, 3–4 sets, 6–12 reps |
| Tue | Easy Cardio | 30–40 min bike/ergometer, Zone 2 (able to speak comfortably) |
| Wed | Strength (Upper Body) | 4–6 exercises, 3–4 sets, 6–12 reps |
| Thu | Rest or easy movement | Walk, mobility |
| Fri | Strength (Full Body) | 4–6 exercises, 3–4 sets, 6–12 reps |
| Sat | Easy Cardio | 30–40 min bike/ergometer, Zone 2 |
| Sun | Rest | — |
Note: Cardio here should be easy and bike-/step-based. This minimizes the interference effect because the load pre-fatigues the legs less than intense running.
Example B — Execution & Coaching Cues
- Order on the same day: Strength first, then cardio – or at least 6 hours apart. This way you start the strength session fresh.
- Cardio intensity: Zone 2, i.e., you can still hold a conversation. No "all-out" intervals directly before or after heavy leg training.
- Choose the mode: Bike, ergometer, stairmaster, or cross-trainer instead of long, hard runs – less eccentric load for the legs.
- Limit volume: Don't run for hours every day. Better to do 2–3 moderate cardio sessions per week.
- Ensure recovery: Eat enough (especially protein and calories), sleep, and pay attention to signals like persistent fatigue or stagnating strength values.
Example C — Microcycle (4 Weeks)
| Week | Strength | Cardio | Focus |
|---|---|---|---|
| 1 | 3 sessions | 2× 30 min easy | Adaptation, technique |
| 2 | 3 sessions | 2× 35 min easy | Slightly increase volume |
| 3 | 3 sessions | 2× 40 min easy | Maintain consistency |
| 4 | 3 sessions | 1× 30 min easy (deload) | Recovery, check strength values |
If strength values and muscle growth stagnate: first reduce cardio volume or intensity, not the strength sessions.
Ideal: Strength and cardio separated (different days or ≥6 h apart), cardio easy and bike-/step-based, 2–3 moderate sessions per week, eat and sleep enough.
Good enough: Strength first, cardio afterward in the same session, moderate intensity, 2 cardio sessions per week – completely sufficient for most recreational athletes.
First step: Schedule one easy 30-minute bike session per week on a training-free day and observe how strength values and recovery develop.
Continue at the source
Read the original sourceFAQ
Does cardio training destroy my muscle growth?
No, not across the board. According to the evidence (including Schumann et al. 2022), moderate amounts of endurance training – especially cycling- or step-based – barely impair muscle growth. It only becomes problematic with very high volume, excessive running training, or directly consecutive intense sessions.
On a given day, should I do strength first or cardio first?
For muscle growth, it is more favorable to complete the strength session first and cardio afterward – or to separate both by at least 6 hours. This way you train strength with fresh energy and reduce the interference effect.
Which form of cardio interferes least with muscle growth?
Cycling- or step-based forms such as ergometer, bike, or stairmaster place less eccentric load on the legs than long, hard runs and therefore interfere less with muscle growth. Easy Zone 2 training is ideal; use intense interval training sparingly.