| Metric | Threshold | Source |
|---|---|---|
| Resting HR athletic | < 60 bpm | Standard cardiology consensus |
| HRV p50 (male <30y) | 55 ms SDNN | Umetani et al. 1998; Shaffer & Ginsberg 2017 |
| VO₂max excellent (male 20-29) | 50–56 mL/kg/min | Cooper Institute, 2010 |
| HR max formula | 208 − 0.7 × age (Tanaka) | Tanaka et al. J Am Coll Cardiol 2001 |
| HR Recovery 1 min | ≤12 bpm = abnormal | Cole et al. NEJM 1999 |
| Metric | Target | Source |
|---|---|---|
| Sleep duration | 7–9 h | Hirshkowitz et al. Sleep Health 2015 (NSF); Watson et al. JCSM 2015 (AASM) |
| Deep (N3) sleep | 13–23% of TST | AASM scoring manual |
| REM sleep | 20–25% of TST | AASM scoring manual |
| Sleep efficiency | > 85% | Standard clinical threshold |
| Level | Risk |
|---|---|
| < 70 dB(A) | Safe for chronic exposure |
| 85 dB(A) | Hearing risk if >40h/week (WHO 1999) |
| 100 dB(A) | Hearing risk after 15 minutes |
| Metric | Threshold | Source |
|---|---|---|
| Walking speed | >1.0 m/s healthy aging marker | Studenski et al. JAMA 2011 |
| Double support time | 20–30% of gait cycle | Clinical gait analysis norms |
| Step asymmetry | <3% clinically relevant | Clinical gait analysis norms |