What is a good HRV score?

There's no universal 'good' number. HRV varies enormously by individual, age, and fitness level. Elite endurance athletes often have higher baseline HRV, but what matters is YOUR baseline and how your readings compare to it. A 'good' score is one that's normal or above for you.

Should I skip a workout if my HRV is low?

Not necessarily. A single low reading could be noise. Look at trends (3-7 day average). If HRV has been declining for several days AND you feel tired, it may be wise to ease up. If it's one low reading but you feel fine, proceed normally. Context matters.

How do I measure HRV?

Most commonly via a chest strap paired with an app (Elite HRV, HRV4Training) or built into smartwatches (Garmin, Apple Watch, Whoop, Oura). Measure consistently—same time (morning is best), same position (lying down), same duration (1-5 minutes).

Why does HRV change day to day?

Many factors affect HRV: sleep quality, stress, training load, alcohol, illness, hydration, time of day, and more. This variability is why you look at trends rather than single readings. Your body's state constantly changes.

Is higher HRV always better?

Generally, yes—higher HRV indicates a well-recovered, well-regulated nervous system. But very high readings (above your normal range) can indicate illness or overreaching. The goal is a stable, relatively high baseline for you personally.

Demystify HRV. Learn what heart rate variability actually measures, how to interpret it, and whether it should influence your training decisions.

Your watch says your HRV is low. Should you skip your workout?

Maybe. Maybe not. Here's what HRV actually means and how to use it intelligently.

What Is HRV?

The Basics

Heart Rate Variability (HRV) = the variation in time between consecutive heartbeats.

Even at a steady heart rate of 60 bpm, the time between beats varies:

Beat 1 to Beat 2: 0.98 seconds
Beat 2 to Beat 3: 1.02 seconds
Beat 3 to Beat 4: 0.99 seconds

HRV measures this variation.

Why It Matters

Your heart rate is controlled by the autonomic nervous system (ANS):

Sympathetic (fight or flight):

Increases heart rate
Decreases HRV
Activated by stress, exercise, poor recovery

Parasympathetic (rest and digest):

Decreases heart rate
Increases HRV
Activated by relaxation, recovery, good health

Higher HRV generally indicates good parasympathetic tone—your body is recovered and adaptable.

Lower HRV can indicate stress, fatigue, illness, or poor recovery.

The Interpretation

HRV Trend	Possible Meaning
Stable, relatively high	Well-recovered, good ANS balance
Gradually increasing	Improving fitness, good adaptation
Suddenly high (above normal)	Possible illness, overreaching, or parasympathetic spike
Declining over several days	Accumulated fatigue, stress, illness
Single low reading	Could be noise (poor sleep, stress, etc.)

How to Measure HRV

Consistency Is Key

Same conditions every time:

Same time of day (morning is best)
Same position (lying down preferred)
Same duration (1-5 minutes)
Same device

Why: HRV varies throughout the day. Consistency allows meaningful comparison.

Measurement Devices

Most accurate:

Chest strap (Polar, Garmin HRM-Pro) + HRV app
Dedicated devices (Whoop, Oura Ring)

Good enough:

Smartwatches with optical sensors (varies by model)
Smartphone camera + HRV app (finger on camera)

Apps and Platforms

HRV4Training: Research-backed, training recommendations. Elite HRV: Detailed analysis, morning readiness. Whoop: Continuous monitoring, recovery scores. Garmin/Apple: Built into watch ecosystem.

Reading Format

RMSSD (most common for HRV):

Measured in milliseconds
Range: typically 20-100+ ms for adults
Higher is generally better

HRV Score (normalized):

Many apps convert to 0-100 or other scales
Makes tracking easier but loses raw data precision

Interpreting Your Data

Baseline First

Before using HRV:

Measure for 2-4 weeks
Establish your personal baseline
Note your normal range

Why: There's no universal "good" HRV. You're comparing to yourself.

Trends Over Single Readings

Don't react to:

One low morning reading
Day-to-day fluctuations

Do respond to:

3-7 day declining trend
Consistently low readings with symptoms
Pattern of low HRV before injuries/illness

Correlate With Feel

The question: Does my HRV match how I feel?

Scenario	Interpretation
Low HRV, feel tired	Listen to both signals—ease up
Low HRV, feel great	Watch the trend, proceed cautiously
High HRV, feel tired	May still need rest, other factors at play
High HRV, feel great	Green light for quality training

Context Matters

Low HRV might be caused by:

Poor sleep
Alcohol
Illness (including before symptoms appear)
High training load
Life stress
Dehydration
Time of day variation

Consider all factors, not just the number.

Using HRV for Training

The Simple Approach

Very high HRV (above normal range):

Could do a harder workout
But also monitor for illness signs

Normal HRV:

Train as planned
No modifications needed

Below normal HRV:

Consider easier training
Monitor for other symptoms
Look at multi-day trend

Very low HRV (significantly below normal for multiple days):

Reduce training load
Prioritize recovery
Consider if something is wrong

Recovery-Based Training

Some apps recommend daily training based on HRV:

Green = go hard
Yellow = moderate
Red = rest or easy

Pros:

Objective input to training decisions
Catches overtraining early

Cons:

May not account for training plan structure
Single metric shouldn't override everything
Can create anxiety about numbers

Practical Integration

What works:

Use HRV as one input among many (sleep, feel, performance)
Trust trends more than single readings
Don't cancel important workouts for one low reading
Do adjust if HRV + feel + performance all point same direction

HRV Limitations

It's Not a Crystal Ball

HRV can't tell you:

Exactly what's wrong
Whether you'll get sick
Whether you'll have a good workout

Individual Variation

Some runners:

Have very stable HRV (small variations)
Have highly variable HRV (large swings)
Respond differently to stress

Your pattern is your pattern. What's normal for someone else isn't relevant.

Measurement Noise

Sources of error:

Movement during measurement
Inconsistent timing
Device inaccuracy
Caffeine, position changes

Reduce noise: Consistent protocol, same conditions, quality device.

Overreliance

Danger: Letting a number override everything else.

Better: Use HRV as one data point alongside:

How you feel
Sleep quality
Performance trends
Life stress
Motivation

HRV Best Practices

For Beginners

Get a baseline: 2-4 weeks of consistent morning measurement.
Look at 7-day averages: Ignore daily fluctuations.
Correlate with feel: Does the data match your experience?
Don't obsess: It's one metric, not the answer.

For Experienced Users

Track long-term trends: Months and years of data are valuable.
Notice patterns: Does HRV drop before illness? After hard weeks?
Use for periodization: HRV can inform training load adjustments.
Maintain perspective: It's still just one tool.

When to Pay Attention

Take HRV seriously when:

Trend has been declining 3+ days
Reading is significantly below normal (20%+)
You also feel tired, unwell, or unmotivated
Performance has been declining

Probably okay to ignore when:

Single low reading
You feel fine
Recently had alcohol, poor sleep, or other clear cause
Reading is just slightly below normal

HRV offers a window into your body's stress and recovery status. Used wisely—tracking trends, maintaining consistency, and integrating with how you actually feel—it's a valuable tool. Used poorly—obsessing over daily numbers, overriding feel with data—it creates more stress than it solves.

Track your metrics on your dashboard.

Contents

Heart Rate Variability (HRV) for Runners: What It Means and How to Use It

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