Figure 4. The Bland Altman plots in the validity assessment: (A) Force platform (FP) vs. the Polar V800/Stride Sensor in squat jump (SJ). (B) High-speed camera/ Kinovea system (HSC/KS) vs. the Polar V800/Stride Sensor in SJ. (C) FP vs. HSC/KS in SJ. (D) Force platform (FP) vs. the Polar V800/Stride Sensor in countermovement jump (CMJ). (E) HSC/KS vs. the Polar V800/Stride Sensor in CMJ. (F) FP vs. HSC/KS in CMJ. R² refers to proportional bias. Dif. = differences.