Figure 7.

Graphical representation of the outcomes of a 30-s CST in the presence of some transitions with harmful levels of noise. The green line represents the estimation of the thigh angle over time, while the red line represents the transitions detected by the hysteresis algorithm. The transitions around Time = 20 and Time = 25 show a strong and narrow inverse peak of noise that tricks the algorithm into detecting a spurious StSi transition, and then another spurious SiSt transition. Thus, an extra SiSt transition was detected for each of them, and the final score was overestimated by two points; 25 SiSt transitions were reported instead of 23.