You perform a 1-repitition maximum (1 RM) bench press exercise and determine your 1 RM weight is 150 lb. You decide to lift weights and do 3 sets of 10 repititions at 90 lb. What percentage of motor units are you recruiting to bench press 90 lb?
NOTE: you may use an on-screen calculator for this question.
To calculate the percentage of motor units recruited to bench press 90 lb, you need to compare it to your 1 RM weight.
The formula to calculate the percentage of motor units recruited is:
(Weight lifted / 1 RM weight) * 100
Let's plug the values:
(90 lb / 150 lb) * 100 = 0.6 * 100 = 60%
Therefore, you are recruiting 60% of your motor units to bench press 90 lb.