Four-week habituation to simulated barefoot running improves running economy when compared with shod running

The purpose of this study was to evaluate the effects of a 4-week familiarization to simulated barefoot running (SBR) on running economy (RE) when compared with shod running. Fifteen trained male runners (age: 24±4years; stature: 177.2±6.21cm; mass: 67.99±7.36kg and VO_2max 70.2±5.2mL/kg/min) were recruited. Subjects completed two RE tests, 24h apart, in a random order, in both the SBR and shod condition (pretest) at 11km/h and 13km/h. Oxygen uptake, heart rate, stride frequency, and foot strike patterns were measured in both conditions. Subjects then completed a 4-week familiarization period of SBR, before repeating the two RE tests (post-test). At pretest, there was no significant difference in RE between SBR and shod running (P=0.463), but following the 4-week familiarization period, RE significantly improved by 6.9% in the SBR condition compared with shod running (46.4±0.9 vs 43.2±1.2mL/kg/min; P=0.011). A significant improvement in RE was observed in the SBR condition (8.09%) between the pretest and post-test (47.0±1.2 vs 43.2±1.2mL/kg/min; P=0.002). RE improved in the SBR condition as a result of familiarization, and became significantly lower in SBR compared with shod running.