The Assessment of the Dynamics of Changes in the Torques of Redressing and Derotating Forces Acting on the Spine During Active Kyphosis-Deepening Exercises in the Dynamic Individual Stimulation and Control for Spine Device (DISC4SPINE, D4S)

<b>Background</b>: The study aimed to assess the dynamics of changes in the torques of derotating and redressing forces acting on the apexes of deformation curvature arches during active, kyphosis-inducing exercises using the D4S device. <b>Methods</b>: The study group included 12 girls aged 9 to 10 years (age X = 9.36, SD = 1.52; weight X = 31.34 kg, SD = 3.28; height X = 134.23 cm, SD = 8.25). The study was carried out using the D4S interactive spine and posture rehabilitation system with dynamic, personalised stimulation. Measurements were taken during six successive therapeutic visits of each patient, each containing five repeated sets. A single set involved applying pressure on the device heads 20 times for 8 s. For each patient, the resistance head was in the right top (RT) setting, individually adjusted for patient needs. <b>Results</b>: The results showed that the values of the measured moments of the derotating-redressing forces acting on the curvature peak vertebrae ranged from 24.1 N/cm² to 39.9 N/cm². The analysis of the differences in the values of the pressure of the derotating head on the spine in subsequent measurements, accounting for all measurements taken in subsequent cycles of the study, indicates significant variation in pressure values (K-W = 31.0660, <i>p</i> = 0.00029 *). Similar dynamics of changes and variation in the results were noted for the values of the pressure applied with the derotating head in subsequent cycles of the study. In this case, the variation in the results was also statistically significant (K-W = 24.4747, <i>p</i> = 0.00018 *). <b>Conclusions</b>: The values of forces increase slightly with the subsequent series of exercises. The assessment of the value of forces may be an element of optimal and more effective training plans in the therapy discussed.