. 2018 Sep 18;13(9):e0202913. doi: 10.1371/journal.pone.0202913

Table 1. The study protocol.

Condition 1: Right leg / fixed location (4 slips and 4 trips)

F1, N1, S1_m, T1_m, F2, N2, S2_m, T2_m, S3_m, T3_m, S4_m, T4_m

Condition 2: Left leg / fixed location (4 slips and 4 trips)

S5_m, T5_m, N3, S6_m, T6_m, S7_m, N4, T7_m, S8_m, T8_m

Condition 3: Random leg / random location (4 slips and 4 trips)

S9_f/R, T9_n/R, T10_f/R, N5, S10_m/L, S11_n/R, N6, T11_m/L, S12_f/R, T12_n/R

F: free walk (no regulation), N: non-perturbed trial (regulated to usual gait pace), L: left leg, R: right leg, S: slip, T: trip. Locations of the hazards on the walkway (n: near, m: middle, f: far). Gait speed (step length and cadence) was regulated using stepping tiles and metronome adjusted to the participant’s usual gait. All participants underwent the same protocol. The bolded letters signify the trials used to in statistical analyses. The purpose and analyses of the F1 and F2 are described in S1 Appendix.