## 3 Results
### Lateral Single-Leg Jump Landing  
There were significant differences in inversion ROM (F\({}_{2,28}\) = 4.344, \(p\) = 0.029, [PERSON]'s \(\Lambda\) = 0.690, \(\eta\)p\({}^{2}\) = 0.658), total ROM in both sagittal (F\({}_{2,28}\) = 6.404, \(p\) = 0.009, [PERSON]'s \(\Lambda\) = 0.373, \(\eta\)p\({}^{2}\) = 0.813) and frontal (F\({}_{2,28}\) = 6.655, \(p\) = 0.006, [PERSON]'s \(\Lambda\) = 0.571, \(\eta\)p\({}^{2}\) = 0.846) planes, ankle joint stiffness (F\({}_{2,28}\) = 3.783, \(p\) = 0.040, [PERSON]'s \(\Lambda\) = 0.703, \(\eta\)p\({}^{2}\) = 0.610), and MLSI (F\({}_{2,28}\) = 7.554, \(p\) = 0.041, [PERSON]'s \(\Lambda\) = 0.664, \(\eta\)p\({}^{2}\) = 0.601) between shoe conditions. Post hoc pairwise tests indicated that inversion ROM was significantly smaller for the high collar, compared to the elastic collar (\(p\) = 0.028, d\(z\) = 0.615) shoe (Table 1). The high collar resulted in a significantly smaller total ROM, compared to the low collar (\(p\) = 0.001, d\(z\) = 0.634) in the sagittal plane (Figure 3), while the elastic collar resulted in a significantly larger ROM, compared to the high collar (\(p\) = 0.019, d\(z\) = 0.873) in the frontal plane (Figure 3). No other pairwise differences were observed for ankle joint stiffness and MLSI (Tables 1 and 2). landings. Our results indicate that the high collar football shoe resulted in smaller dorsiflexion ROM and total ROM in the sagittal plane during the anterior single-leg jump landing, while it also decreased inversion ROM and total ROM in the sagittal and frontal planes during the lateral single-leg jump landing. We also found that ankle joint stiffness was significantly larger for the high collar football shoe during anterior and lateral single-leg jump landings, which contradicted our original hypothesis. For dynamic stability, only MLSI showed significant differences during both landing tasks, which was greater when wearing the high collar football shoe and lesser in other conditions; this is partly consistent with our original hypothesis. The ankle ROM during the anterior single-leg jump landing suggested that the high collar significantly constrained ankle movement, compared to the elastic and low collars. These findings are consistent with [PERSON] et al. and [PERSON] et al., who reported that peak ankle dorsiflexion or total ankle ROM during a sagittal maneuver was reduced as collar height increases [13; 37]. They suggested that collar height and material play an important role in influencing the flexibility and deformation of the whole shoe [13; 37]. Additionally, the high collar basketball shoes with strips of plastic that are positioned at the collar's anterior and posterior to the medial and lateral malleoli showed a more restricted ROM of the ankle joint in the sagittal and frontal planes, compared to no plastic condition [16]. It is noteworthy that the elastic collar could not constrain the ankle movement, which might have been due to the low rigidity or high elasticity of the collar material. However, there was no significant change in the frontal plane's ROM. One possible reason is that our healthy participants might have had few inversion-everson movements during the anterior single-leg jump landings, because our results detected significant differences in inversion and total ankle ROM in the frontal plane between the high and elastic collar, but not between the high and low collar during lateral single-leg jump landings. The elastic collar, similar to ankle taping, likely provides a feeling of confidence and stability [18; 24]. This result, in our perspective, is in disagreement with a recent report that indicated that high collar basketball shoes do not restrict the peak inversion angle (29.3\({}^{\circ}\) vs. 28.3\({}^{\circ}\)) and ROM (17.4\({}^{\circ}\) vs. 15.2\({}^{\circ}\)) in a self-initiated drop landing on an inversion platform [14].