**3. Results**

The personal characteristics of the two groups are detailed in Table 1. There were no significant di fferences between the two groups in age, sex, and BMI.


**Table 1.** Median and interquartile ranges of demographic characteristics of the subjects.

TD: Typically Developed; ASD: Autism Spectrum Disorder; BMI: Body Mass Index.

The maximal limb accelerations of each group in each condition, as well as the coordination parameters of the upper and lower limbs are presented in Table 2. There was a significant main e ffect of group, but there was no main e ffect of condition. Specifically, the TD children reached higher accelerations of their left limbs during self-selected rhythm jumping compared to children with ASD (Figure 1). In that condition, the LV of their legs were lower compared with the LV of the legs of children with ASD (Figure 2). Additionally, the LV of the arms in TD children, jumping with the rhythmic signal, was lower compared to that of the ASD group (Figure 2).

**Figure 1.** The maximal acceleration (m/s2) of the (**a**) left leg with self-selected rhythm and (**b**) left arm with self-selected rhythm in Typically Developed (TD) children and children with Autism Spectrum Disorder (ASD).

**Figure 2.** The lag variability of the (**a**) legs with self-selected rhythm and (**b**) arms with rhythmic signal in Typically Developed (TD) children and children with Autism Spectrum Disorder (ASD).


**Table 2.** Medial and interquartile percentage of the maximal acceleration values (m/s2) of each limb and the coordination measures for the time of the peak

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post hoc Mann-Whitney results in bold (\* *p* < 0.05 and \*\* *p* < 0.01).
