Input Parameters
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Lander 1RMLander 1985
113.7kg
~251 lbs
Clinical Responsibility Note: This calculation provides statistical estimations for informational and educational purposes only. It is not an individualized medical diagnosis or clinical prescription.
Mathematical Formula & Scientific Methodology
Formula: J. Lander Formula (1985)
1RM = (100 × Weight) / (101.3 - 2.67123 × Reps)Published in the NSCA Journal, modeling percentage load degradation per repetition.
Model Assumptions
- Trained lifters
Variables & Standard Units
| Symbol | Physiological Meaning | Unit |
|---|---|---|
| 2.67123 | Linear fatigue slope coefficient per repetition | dimensionless |
Scientific Limitations
- Valid for reps 1 to 15
Peer-Reviewed Scientific Citations
Maximum based on reps (1985)
Lander J (1985) — National Strength and Conditioning Association Journal, 6(6), 60-61
Key Finding: 1RM = (100 * weight) / (101.3 - 2.67123 * reps). Linear model widely used in strength conditioning.
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