Fysiqal
Tracking
Tracking

Readiness, Recovery, and Strain Scores

2 min read
Sources and review status

Review pending — this text hasn’t been signed off by a reviewer yet.

See this lesson’s sources
readiness-scorerecovery-scorestrain-scorewhoopouracomposite-metricautoregulation

0% read · 2 min left

DefinitionA short reference note, not a full lesson.
Definition

These single numbers blend HRV, resting HR, sleep, and recent load against your own baseline — useful directional nudges, but proprietary, baseline-relative, and not to be obeyed over how you feel.

Detail

Consumer wearables roll several signals into headline scores:

  • Readiness / Recovery score — "how recovered are you today" as a percentage or 0–100. The most common inputs are HRV (the heaviest contributor), resting heart rate, sleep duration/quality, respiratory rate, skin temperature, and recent training load, each compared to your personal baseline rather than a universal standard. (See Heart-Rate Variability (HRV), Resting Heart Rate (RHR), Sleep Tracking.)
  • Strain score — "how much stress you've put on the body today," driven mainly by heart-rate-derived load over the day/session. One popular platform uses a 0–21 strain scale based on the Borg perceived-exertion concept.

The intended loop: high readiness/recovery → green light for hard training; low → ease off or recover. Strain is then balanced against recovery so you train hard when recovered and pull back when not (a form of RPE / RIR Autoregulation).

Critical limits — treat scores as directional, not gospel:

  • Proprietary and opaque. Each brand's algorithm differs and is undisclosed, so scores aren't comparable across devices and can't be independently validated. Research evaluating these composite scores finds them inconsistent.
  • Baseline-relative. A "70%" means relative to your recent norm, not an absolute health statement.
  • Garbage-in. They inherit sensor error, especially wrist-optical HRV/HR (see HR Monitor Accuracy (Chest vs Optical), Wearable Accuracy and Its Limits).
  • They miss life. A score can read "recovered" while you feel awful, or vice versa.

Use them alongside your own subjective ratings and training-load picture (see Training-Load Monitoring (Acute:Chronic)); when score and feel disagree, weight how you feel and the trend, not a single day's number. A sustained low-recovery run is a real flag (see Overtraining vs Overreaching).

Key facts

  • Readiness/recovery blend HRV (top input) + RHR + sleep + resp rate + skin temp + load.
  • Scores are computed vs your personal baseline, not an absolute scale.
  • Strain ≈ daily HR-derived load; one platform uses a 0–21 Borg-based scale.
  • Algorithms are proprietary, brand-specific, not cross-comparable or independently validated.
  • Directional nudges only — don't override how you feel; pair with subjective ratings.

Connections

Go deeperRPE / RIR Autoregulation

Sources

Cited in text — not yet linked
Wearable score documentation (WHOOP strain 0–21; Oura readiness) and a composite-score

Keep this lesson, or ask how it applies to you.

Save the lessonFree account · keeps it in your LibraryAsk a question about thisAnswers cite the Library’s own articlesBuild my planFree · starts a performance plan that uses this, then brings you back here

Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.

Explore related topics

Atlas Connections

RPE / RIR Autoregulation
Adjusting load and volume day to day by how hard a set actually feels — using Reps in Reserve (RIR) or a 1–10 RPE scale — so the dose tracks real readiness instead of a fixed number on paper.
HR Monitor Accuracy (Chest vs Optical)
Chest straps read the heart's electrical signal and are the more accurate reference; wrist optical sensors are convenient and usually close at rest but err more during intense or wrist-moving exercise.
Heart-Rate Variability (HRV)
HRV is the tiny beat-to-beat timing variation in your heart rate; higher (vs your own baseline) generally signals good recovery, lower signals stress or fatigue.
Subjective Readiness Ratings (Mood / Energy / Soreness)
A 10-second daily self-rating of mood, energy, sleep, soreness, and stress is cheap and, in research, tracks training stress at least as well as expensive sensors.
Resting Heart Rate (RHR)
Beats per minute fully at rest — a cheap fitness and recovery marker; a sustained rise above your baseline flags fatigue, stress, or illness.
Sleep Tracking
Track sleep duration and consistency first; treat wearable "stage" breakdowns as rough, and judge quality mostly by how you feel and function.
Training-Load Monitoring (Acute:Chronic)
Quantify how much training you're doing — internally (sRPE, HR) and externally (volume, distance) — and watch how fast load is ramping relative to what you're used to.
Wearable Accuracy and Its Limits
Wearables are good at some things (steps, heart rate at rest) and weak at others (calorie burn, sleep stages) — trust their trends over their absolute numbers.
Overtraining vs Overreaching
A spectrum of too much training with too little recovery — from functional overreaching (a brief dip that rebounds into gains) through non-functional overreaching to overtraining syndrome (severe, prolonged underperformance taking months to resolve).