Response to letter to the editor: Methodological considerations for a non-linear analysis of running in the heavy and severe intensity domains.

Dear Editor, We appreciate the opportunity to reply to the letter by Yentes et al. regarding our publication, "A non-linear analysis of running in the heavy and severe intensity domains" (Hunter et al. [2]). Figure 1 shows power spectrum density plots for a participant for hip, knee, and ankle flexion/extension prior to smoothing of marker coordinates. 1 Power spectral density plots of the ankle, knee and hip joint of a trial from a single participant representative of the group mean prior to smoothing. [Extracted from the article]