The Baseline Principle
Alpha Helix does not compare you to professional athletes, population averages, or generic health targets. Your score is based on what is normal for you.
Each signal is interpreted against a personal baseline built from your recent history. This matters because the same heart rate, HRV, sleep duration, or training load can mean very different things for different people.
Helix gives more importance to recent data while still preserving longer-term patterns. This allows the system to respond to changes in sleep, training, travel, illness, stress, and fitness without overreacting to a single unusual day.
Baseline learning: Helix needs enough data to understand your normal range before scores become meaningful. Early scores may be marked as developing while your baseline matures.
The Triple Helix Framework
The Helix Index is built from three physiological strands: Sleep, Load, and Recovery.
| Strand | Role | What It Represents |
|---|---|---|
| Sleep | Restores | The overnight foundation for physical and cognitive restoration |
| Load | Stresses | The recent demand placed on your body through training and activity |
| Recovery | Rebuilds | The cardiovascular and autonomic signals that show how well your body is returning to baseline |
The three strands are separate but interdependent. Strong training only helps if recovery can absorb it. Good sleep supports recovery. A low recovery state can limit readiness even when sleep or activity looks normal.
Sleep Strand
The Sleep strand evaluates overnight restoration. It looks beyond total hours and considers the structure, timing, and stability of your sleep.
| Signal | What It Reflects |
|---|---|
| Sleep Duration | Total sleep relative to your own normal range |
| Sleep Consistency | Regularity of your sleep and wake timing |
| Deep Sleep | Physical restoration and repair |
| REM Sleep | Cognitive restoration, memory, and emotional processing |
| Sleep Disturbance | Fragmentation from awakenings and disrupted sleep |
| Respiratory Rate | Overnight breathing stability and systemic stress |
| Wrist Temperature | Temperature deviation that may reflect immune activity, alcohol, hormonal variation, or training accumulation |
Sleep duration is not judged against a fixed eight-hour target. It is interpreted relative to your own baseline. A shorter-than-normal night usually matters more than a longer-than-normal night because insufficient sleep directly limits restoration.
When certain sleep signals are unavailable from Apple Health, Helix adjusts the calculation and lowers confidence rather than pretending the data is complete.
Load Strand
The Load strand evaluates recent physiological demand. It compares recent activity against your recent capacity so the app can distinguish a productive training pattern from an unusual spike.
Helix considers structured workouts, heart rate intensity, and general daily activity. A hard workout, a long day of walking, and a recovery day all create different forms of demand.
The purpose of the Load strand is not to reward doing more. It is to understand whether your current activity level is balanced, unusually low, or unusually high relative to your own recent history.
Important caveat: Load is not an injury prediction system. It is a readiness input that helps describe the relationship between recent demand and recent capacity.
Recovery Strand
The Recovery strand evaluates how well your body is returning toward baseline after stress. It focuses on cardiovascular and autonomic signals collected primarily during rest and sleep.
| Signal | What It Reflects |
|---|---|
| Heart Rate Variability | Autonomic balance and nervous system recovery |
| Resting Heart Rate | Accumulated fatigue, illness, stress, or cardiovascular strain |
| Overnight Heart Rate Dip | How deeply your body shifted into recovery during sleep |
| Overnight Respiratory Rate | Breathing stability and systemic stress during sleep |
Heart rate variability is highly individual. A value that is excellent for one person may be normal or suppressed for another. Helix therefore interprets HRV relative to your personal baseline, not against a universal target.
Overnight heart rate dip is also important. During restorative sleep, heart rate usually falls as the body shifts into a more recovered state. Stress, illness, alcohol, and heavy training can reduce that dip.
The Helix Index
The Helix Index combines Sleep, Load, and Recovery into one daily readiness score.
The score is not a simple average. Helix considers how the strands interact. Better sleep can support recovery. High recent load can suppress recovery. A severely reduced recovery state can limit the overall score even when other signals look acceptable.
The index also accounts for balance. Three moderately healthy strands may represent a more stable readiness state than one strong strand combined with two weak ones.
Confidence
Health data is imperfect. Watches are not always worn. Some devices do not provide every signal. Sleep staging, temperature, HRV, and respiratory data can vary in availability.
When data is missing, Helix does not hide that fact. The app calculates from available signals, adjusts the interpretation, and displays a confidence level so you know how complete the underlying data was.
- High Confidence Most expected signals are present and the baseline is well-established.
- Medium Confidence Some signals are unavailable, but the score is still supported by enough data to be useful.
- Low Confidence Multiple signals are missing or the baseline is still developing. The score should be treated as an estimate.
Privacy and Processing
Alpha Helix is designed as an interpretation layer above Apple Health. Your health data stays on your device. The app does not require an account, does not upload your health data to a server, and does not sell personal health information.
The methodology is intentionally transparent about what kinds of signals influence the score and why. Exact implementation details may evolve as the app is validated and improved.
What Helix Is Not
Alpha Helix is not a medical device. It does not diagnose illness, detect disease, prescribe treatment, or replace the guidance of a qualified health professional.
The Helix Index is a readiness signal. It describes your current physiological state relative to your own history so you can make more informed decisions about training, recovery, and daily effort.
Contact
Questions: support@alphahelix.app
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Eugene, Oregon