Configure physiological training thresholds using the highly personalized Karvonen Heart Rate Reserve (HRR) methodology alongside traditional maximal heart limits.
Target Heart Rate (THR) zones provide an objective infrastructure for modulating cardiopulmonary strain during physical execution. Measuring training intensity via biometric feedback prevents metabolic under-stimulation while mitigating structural and myocardial fatigue thresholds.
Traditional tracking systems extract baseline thresholds purely using fixed percentages of a user's calculated peak limit ($HR_{max}$). This crude method overlooks variations in resting baseline states. The **Karvonen Method** resolves this by establishing metrics from your explicit Heart Rate Reserve (HRR).
By mapping the dynamic gap between resting metabolic states and absolute physical boundaries, the Karvonen method customizes mathematical zone bounds to a person's current systemic athletic adaptations.
The system actively runs calculations across two key structural branches:
Heart Rate Reserve Calculation: $HRR = HR_{max} - HR_{rest}$
Karvonen Target Range ($THRR$): $THRR = (HRR \times \text{Intensity \%}) + HR_{rest}$
Standard Max HR Target Formula ($THR_{max}$): $THR_{max} = \text{Intensity \%} \times HR_{max}$
| Intensity Tier | Karvonen (HRR) Range | Standard ($HR_{max}$) Range | Borg RPE Scale |
|---|---|---|---|
| Very Light Intensity | < 19% | < 34% | < 10 (Extremely Gentle) |
| Light Core Loading | 20% - 39% | 35% - 54% | 10 - 11 (Warm Up Status) |
| Moderate Aerobic Zone | 40% - 59% | 55% - 69% | 12 - 13 (Steady Endurance) |
| Hard Anaerobic Threshold | 60% - 84% | 70% - 89% | 14 - 16 (Heavy Ventilation) |
| Very Hard (Max Interval) | 85% - 100% | 90% - 100% | 17 - 19 (Neuromuscular Limit) |