## 2 Materials and Methods
### Instruments
#### 2.2.2 Continuous Kinetic Variables Computation Formulas  
The Orange Matrix contains a series of data necessary for calculating the kinetic variables: (i) in cell B4, the acceleration of gravity; (ii) in cells B5 and B6, the time at the start and end of the baseline measurement; (iii) in cells C5 and C6, the force at those moments; (iv) in cells B7 and B8 and C7 and C8, the time at the start and end of the jump and the corresponding force values; and (v) in cells B9 and B13, a series of variables related to body weight:  
* Cell B9. The weight in Newtons is calculated based on the values between points B1 and B2 (baseline) on the pink-bordered graph.
* Cell B10. The body mass in kg is determined from the weight (cell B9) and the acceleration of gravity (cell B4).  
Cells B11 and B12 display the weight recorded with an external scale, indicated on the Input sheet, which serves as a confirmatory measure to ensure consistency with the calculated weight value.
* Cell B13 contains half of the body weight.  
To calculate the kinetic variables of the CMJ, velocity and displacement at each instant are determined through an integration process based on instantaneous acceleration. This process is explained in detail below. The sheet is designed to accommodate up to 5000 records. If the platform records at 1,000 Hz, this corresponds to a recording duration of 5 s (with each row representing one millisecond). The sampling number is displayed in the Green Matrix, column A. Columns B, C, E, and F contain data from the \"Input\" sheet. Columns D, F, and H calculate the resultant force: column D shows the resultant force by subtracting the force recorded by the platform from the participant's weight (column D) or half of the body weight (columns F and H). The White Matrix displays the rows containing the jump data, as selected on the Pink Border Plot. The Grey Matrix shows data from the resultant force (limited to data selected in the Pink Border Plot), the Blue Matrix displays data from the force platform under the left leg, and the Red Matrix includes data from the force platform under the right leg.  
Columns L, R, and X display the instantaneous total resultant force, the force recorded on the left platform and the force on the right platform, respectively. Columns M, S, and Y contain the instantaneous acceleration data, calculated by dividing the instantaneous force by the weight. Columns N, T, and Z present the instantaneous velocity, derived from the instantaneous acceleration and the velocity of the preceding row. In columns O, U, and AA, displacement is calculated using the instantaneous velocity and the displacement from the previous row. The instantaneous power (columns P, V, and AB) is determined based on the instantaneous force and velocity. Finally, the instantaneous impulse (columns Q, W, and AC) is computed using the instantaneous force and the sampling frequency. All these calculations are summarized in Table 1.  
\begin{table}
\begin{tabular}{c c c c} \hline
**Matrix** & **Variable** & **Excel Col.** & _Computation_ \\ \hline \multirow{4}{*}{Net resultant force} & \multirow{2}{*}{D, L} & Subtracting the participant’s weight to the resultant force at each instant \\ \cline{2-3}  & & & M \\ \cline{2-3}  & & & \\ \cline{2-3}  & & & \\ \cline{2-3}  & & & \\ \cline{2-3}  & & & \\ \cline{2-3} Grey & & & \\ \cline{2-3}  & Displacement of the CG & & & \\ \cline{2-3}  & & & & \\ \cline{2-3}  & & & & \\ \cline{2-3}  & & & & \\ \hline \multirow{4}{*}{Instantaneous power of the CG} & \multirow{2}{*}{P} & Multiplying the net resultant force at each instant by the velocity of the CG at each instant \\ \cline{2-3}  & & & & each instant \\ \cline{2-3}  & & & & each instant \\ \cline{2-3}  & & & & \\ \hline \multirow{4}{*}{Instantaneous impulse of the CG} & \multirow{2}{*}{Q} & Multiplying the net resultant force at each instant by the time of one record \\ \cline{2-3}  & & & & \\ \cline{2-3}  & & & & \\ \hline \end{tabular}
\end{table}
Table 1: Computation of the continuous kinetic variables.