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Muscle Fiber Type Ratio Predictor
Predict dominant muscle fiber type (fast vs slow-twitch) from 1RM vs endurance performance.
Your one-rep maximum for the chosen lift
How many reps you can do at 80% of your 1RM
Results
Estimated Fast-Twitch (Type II)68%
Estimated Slow-Twitch (Type I)32%
80% Load Used80.0 kg
What is it?
Predicts your dominant muscle fibre type based on how many reps you can perform at 80% of your one-rep maximum.
How to use
Enter your 1RM and the number of reps you can complete at 80% of that weight. Results indicate Type I vs Type II fibre dominance.
Example scenario
If you can do 12 reps at 80% 1RM, you likely have a higher proportion of slow-twitch fibres — ideal for endurance sports.
Pro tip
Fast-twitch dominant athletes respond better to lower rep ranges (1-5). Slow-twitch dominant athletes thrive on higher reps (12+).