**5. Conclusions**

EMG amplitude peaks for several LLM were smaller for the hardest CFI (selective aluminum 60 HB Brinell hardness) than the other CFIs (polypropylene 58◦ Shore D, EVA 52◦ Shore A, and standard EVA 25◦ Shore A), except for the fibularis longus in right curves that is increased when the knee touches the road increasing the stability.

**Author Contributions:** All authors: concept, design, analyses, interpretation of data, drafting of manuscript or revising it critically for important intellectual content.

**Acknowledgments:** We would like to thank the persons that participated in this research.

**Conflicts of Interest:** The authors declare no conflict of interest.
