HRV Training

Mechanisms:

• HRV measures variation in time between heartbeats - controlled by autonomic nervous system
• Higher HRV generally indicates parasympathetic (rest/recovery) dominance and adaptability
• Lower HRV indicates sympathetic (stress/fight-or-flight) dominance or fatigue
• Resonance breathing (typically 4.5-7 breaths/min) maximizes respiratory sinus arrhythmia
• Regular biofeedback training strengthens vagal tone over time

Key concepts:

• Resonance frequency - your personal optimal breathing rate where HRV amplifies (usually 5-6 breaths/min)
• Coherence - state where heart rhythm, breathing, and blood pressure sync up
• rMSSD - common HRV metric for recovery; measures parasympathetic activity
• Morning readiness - HRV measured upon waking reflects overnight recovery
• Baseline vs daily - individual trends matter more than absolute numbers

Evidence base:

• Meta-analyses show HRV biofeedback reduces stress, anxiety, and depression symptoms
• Resonance frequency breathing improves athletic recovery and emotional regulation
• Morning HRV tracking validated for guiding training load in athletes
• Studies show 4-10 weeks of training needed for lasting HRV improvements
• Mixed evidence on whether higher HRV directly causes better outcomes vs. reflects them

Limitations:

• Individual baselines vary hugely - comparisons between people meaningless
• Many factors affect HRV (alcohol, sleep, illness, hydration, time of measurement)
• Consumer devices less accurate than research-grade equipment
• "Readiness scores" are proprietary algorithms, not pure HRV

Getting started:

1. Choose a tracking method - Phone app + chest strap for accuracy, or wearable for convenience
2. Establish baseline - Track morning HRV for 1-2 weeks before making decisions from data
3. Find your resonance frequency - Use an app to test breathing rates from 4.5-7 breaths/min
4. Start biofeedback sessions - 5-10 minutes daily at your resonance frequency
5. Use data to guide training - HRV below baseline suggests recovery day; above suggests push day

Morning HRV protocol:

• Measure within 5 minutes of waking, before getting out of bed
• Same position daily (lying or seated)
• 1-3 minute reading minimum
• Don't check after poor sleep and expect good news - just log it
• Look at 7-day rolling average, not single days

Resonance breathing protocol:

• Find a quiet spot, sit comfortably
• Breathe at your resonance frequency (typically 5-6 breaths/min)
• Inhale 5-6 seconds, exhale 5-6 seconds (adjust to find your sweet spot)
• Watch biofeedback display - aim for smooth, high-amplitude waves
• Start with 5 min sessions, build to 10-20 min

When to use HRV data:

• Morning HRV 10%+ below baseline → consider easy day or rest
• Morning HRV at or above baseline → green light for hard training
• Consistently suppressed HRV → possible overtraining, illness, or life stress

Risks:

• Over-reliance on data - ignoring how you actually feel
• Anxiety from "bad" HRV numbers creating stress (which lowers HRV)
• Skipping important workouts due to single low readings
• Hyperventilation if breathing too fast during practice
• Analysis paralysis from too many metrics

Contraindications:

• Cardiac arrhythmias (HRV data may be unreliable or misleading)
• Severe anxiety disorders (biofeedback may increase body awareness unhelpfully - work with therapist)
• Pacemaker or implanted cardiac device (consult cardiologist first)

Warning signs:

• Obsessive checking multiple times per day
• Mood determined by morning HRV number
• Avoiding all exertion when HRV is low
• Frustration when HRV doesn't improve on expected timeline

How to avoid problems:

• Trust trends over single data points
• Use HRV as one input, not the only input
• If a low HRV day feels fine, light movement often helps
• Take breaks from tracking if it becomes stressful

Key metrics:

• Morning rMSSD or HRV score (primary)
• 7-day rolling average (more reliable than daily)
• Coherence score during biofeedback sessions
• Session duration and frequency
• Subjective feel vs HRV correlation

Signs it's working:

• More stable morning HRV (less erratic day-to-day)
• Baseline HRV trends upward over weeks
• Faster recovery after hard training
• Better awareness of stress/recovery state
• Improved ability to calm down on demand

Entry level (free to $50):

• Elite HRV - Free app, morning readiness + biofeedback
• HRV4Training - Phone camera or chest strap, science-focused
• Polar H10 chest strap (~$90) - Gold standard for accuracy

Mid-tier wearables ($200-300):

• Oura Ring - Overnight HRV, sleep tracking
• Whoop - Recovery scores, strain tracking
• Garmin watches - Morning HRV, body battery

For detailed device comparisons and recommendations: HRV Zone

Key researchers and educators:

• Marco Altini, PhD - Creator of HRV4Training, researcher, practical HRV science
• Jason Moore - Elite HRV founder, HRV education
• Andrew Huberman - Covers HRV and breathing protocols
• Peter Attia - Discusses HRV in longevity/training context

Online communities:

• r/hrv - HRV tracking discussion
• Elite HRV Facebook group
• Oura and Whoop communities

Common positive reports:

• "Finally understand why some days feel off"
• "Helped me stop overtraining"
• "Resonance breathing is like a reset button"
• "Caught early signs of getting sick"

Common complaints:

• "Obsessed over numbers at first"
• "Wearable HRV less accurate than chest strap"
• "Takes weeks to see trends"
• "Morning routine adds time"

Pairs well with:

• Morning Sunlight - Both support circadian rhythm and autonomic balance
• Cold Exposure - Trains autonomic flexibility; HRV shows adaptation
• Zone 2 Cardio - HRV guides training intensity; Z2 improves baseline HRV
• Time-Restricted Eating - Both optimize recovery; HRV often improves with consistent eating window

Timing considerations:

• Morning HRV before getting out of bed
• Biofeedback sessions anytime, but consistent timing helps
• Use HRV to decide training intensity for the day

Stacks with:

• All recovery interventions
• Training and longevity protocols
• Stress management approaches