05/26/2022
What is Inroad? Inroad is the depth of momentary muscular fatigue attained due to exercise. Inroad is the process to stimulating growth within the body. Turning on this growth mechanism is the real objective in exercise. The concept "inroad" is what differentiates exercise from non-exercise. If your effort is geared toward this momentary fatigue (inroad) within one to four minutes in a particular exercise, then you are within the realm of exercise. If your effort is devoted to prolonging activity (avoiding inroad) ie., achieving a state of steadiness, then you are moving away from exercise. Inroad is the intellectual foundation of exercise, yet few have ever heard of this term.
Below shows the performance of a static leg extension exercise. In yellow is the performance (force) of the subject. The subject maintains 250lbs for approximately 65 seconds. At 65 seconds (green arrow) momentary muscular failure is achieved. With continued effort the subject brings their strength down to the orange horizontal line at 213lbs before unloading. Imagine that the absolute force the subject can produce is 325lbs. The red line shows the declining strength of the subject from 325lbs down to 213lbs. 325-213= 112lbs 112/325 = .344×100= 34.4% inroad
