title: Author's Response to Comment on "Contributions of the individual ankle plantar flexors to support, forward progression and swing initiation during walking" (Neptune et al., 2001) and "Muscle mechanical work requirements during normal walking: The energetic cost of raising the body's center-of-mass is significant" ().
authors.affiliation: Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA.
authors.forename: Richard R
authors.initials: RR
authors.lastname: Neptune
authors.forename: Felix E
authors.initials: FE
authors.lastname: Zajac
authors.forename: Steven A
authors.initials: SA
authors.lastname: Kautz