When we look at a single throw traditionally we categorize it by RPE (Rate of Perceived Exertion). The issue with determining a throws value by RPE is that most players do not effectively categorize a throws intensity from feel.

With advancements in technology we can now track exact stress per throw and apply objective measures through daily training or play. Let’s look at how this is done.

Newton Metre, or NM, represents torque on the arm during any single throw. This torque will range from throw to throw. Generally higher torque or “high effort throws” can be valued any Newton Metre reading above 45Nm. Lower torque or a “lower effort throw” can be valued any Newton Metre reading below 45Nm.

Typically as we progress in distance or velocity our stress value will progress as well. Using this knowledge let’s calculate the value of a single throw.

Let’s say our first throw today was a throw at 20Nm. The Motus Sleeve would track this throw and place a value of 20Nm to it.

The problem we face though is our value of 20Nm does not reflect our size. To normalize this to our body type we must utilize an equation. Just as all throws are not created equal neither should all athletes. Some athletes are much larger with longer limb length. Some smaller.

To take into account your individual size Motus calculates a single throw by taking Nm and dividing it by height times weight. From there they raise this to the power of 1.3.

Seems complicated but keep in mind this is all being auto generated as you throw. The Motus Sleeve does this for every throw. That means as you throw in your game or training session your Motus Sleeve is working in the background to value every throw for you.

Once your throwing day is complete the Motus Sleeve adds up all of your single throw values and creates what is called “Daily Workload” (DWL for short). Daily Workload accounts for all stress and total volume per day.

This value can be used to develop uniquely individualized throwing plans and allow insight to how ready any given pitcher is to compete. In our next units we will discuss how daily workload over time we can calculate both Acute and Chronic workload.