Testing protocol · Strength
Repetition maximum and estimated 1RM
Load lifted and repetitions completed to failure, in one set per athlete; the one-rep max is estimated with the Brzycki equation from 1 to 12 repetitions. Record the exercise and the equipment. It does not prescribe training loads.
Version 1 of the protocol in the StatsCenter catalogue.
Calculator
One-rep max (1RM) calculator: the Brzycki equation
Enter the load lifted and the repetitions completed to failure, from 1 to 12. With one repetition, the 1RM is the load itself.
The formula
Estimated 1RM = load (kg) × 36 ÷ (37 − repetitions)
Brzycki (1993), Journal of Physical Education, Recreation & Dance 64(1):88-90. The equation estimates; it is not a clinical report and does not replace a direct measurement. It is the same calculation StatsCenter applies when a club collects.
Result
When collecting
What StatsCenter records and calculates.
Read from the product's protocol catalogue, in the version a club uses today when it creates an assessment.
Measures
- Load lifted
- kg · recorded as measured
- Repetitions completed
- repetitions · recorded as measured
Collection conditions
- Exercise
- Listed: back squat, Smith machine squat, leg press, bench press, deadlift and hip thrust; another can be described. Must match for two collections to be compared.
- Equipment
- Listed: free barbell, Smith machine and machine; another can be described. Must match for two collections to be compared.
Derived values
Estimated 1RM
kg- Equation
- load (kg) × 36 ÷ (37 − repetitions)
- As published
- load ÷ (1.0278 − 0.0278 × repetitions); 1.0278 and 0.0278 round 37/36 and 1/36
- Repetitions
- a whole number from 1 to 12; with 1 repetition, the 1RM is the load itself
One-rep max estimated with the Brzycki equation. Brzycki (1993), Journal of Physical Education, Recreation & Dance 64(1):88-90. Source
Protocol reference
- Strength Testing: Predicting a One-Rep Max from Reps-to-Fatigue. An equation estimating the 1RM from repetitions to failure; it does not replace a direct 1RM test or set training loads.
Other protocols
Who uses it at the club
Record your squad's repetition maximums in StatsCenter.
The protocol comes ready, with its attempts, its formulas and every athlete's history.
No card needed, every module included. Sign-up and the product are in Portuguese.