What is it (in research terms)?
Diaphragmatic breathing (DB) is a breathing pattern that emphasises diaphragm activation, reduced upper chest movement and a slower respiratory rate, often paired with nasal breathing and longer exhales.
Nervous system and stress
Strong evidence
- Activates the parasympathetic nervous system (vagus nerve)
- Increases heart rate variability (HRV), a marker of resilience
- Reduces cortisol and perceived stress
Key findings
- A 2017 study (Ma et al.) showed diaphragmatic breathing significantly reduced cortisol after 8 weeks
- Slow breathing (around 5–6 breaths per minute) improves vagal tone and emotional regulation
Takeaway
Diaphragmatic breathing is one of the simplest, evidence-based tools for stress reduction.
Respiratory efficiency
Moderate to strong evidence
- Improves tidal volume (deeper breaths)
- Reduces respiratory rate
- Improves oxygen exchange efficiency
Used clinically in
- COPD
- Asthma management
- Post-surgical rehabilitation
Takeaway
Less effort, more efficient breathing.
Core stability and function
Emerging but important evidence
The diaphragm works with:
- Transversus abdominis
- Pelvic floor
- Multifidus
This system regulates intra-abdominal pressure.
Research shows
- Proper diaphragm function improves spinal stability (Hodges and colleagues)
- Dysfunctional breathing is linked to low back pain
Takeaway
Breathing is part of the core system, not separate from it.
Pain and musculoskeletal health
Growing evidence
- Reduces pain perception via nervous system down regulation
- Helps reduce neck and shoulder overactivity
- Associated with improvements in chronic low back pain
Takeaway
Highly relevant for people with tension and postural issues.
Sleep and recovery
Moderate evidence
Slow diaphragmatic breathing:
- Reduces arousal
- Improves sleep onset
- Enhances recovery
Used in
- Insomnia protocols
- Anxiety management
Metabolic and hormonal impact
Early but promising evidence
Indirect effects via:
- Reduced cortisol
- Improved insulin sensitivity (via stress reduction)
Important nuance
- Diaphragmatic breathing is not just “belly breathing”
- Over-emphasising abdominal expansion without ribcage control can reduce core function
- The goal is 360-degree ribcage expansion with coordinated core activation
Practical takeaway for you
Diaphragmatic breathing can:
- Reduce stress
- Improve core stability
- Support posture
- Enhance movement efficiency
- Improve recovery and sleep
Diaphragmatic breathing, also known as abdominal or belly breathing, is a technique that emphasises using your diaphragm effectively. Here’s how to do it:
1. **Find a Comfortable Position**:
Sit or lie down in a comfortable position. If you’re sitting, keep your back straight.
2. **Place Your Hands**:
Put one hand on your chest and the other on your abdomen. This will help you feel the movement as you breathe.
3. **Inhale Deeply**:
Through your nose, take a slow, deep breath in. Focus on filling your abdomen with air rather than your chest. Your abdomen should rise more than your chest.
4. **Pause Briefly**:
Hold the breath for a moment, allowing the air to fill your diaphragm.
5. **Exhale Slowly**:
Breathe out slowly through your mouth, feeling your abdomen fall. Try to exhale for a longer duration than your inhale.