title: Barefoot Running Reduces the Submaximal Oxygen Cost in Female Distance Runners.
abstract: Berrones, AJ, Kurti, SP, Kilsdonk, KM, Cortez, DJ, Melo, FF, and Whitehurst, M. Barefoot running reduces the submaximal oxygen cost in female distance runners. J Strength Cond Res 30(8): 2348-2353, 2016-Being a competitive distance runner is, in part, attributable to a high V[Combining Dot Above]O2max. However, running economy (RE) is a more robust indicator of distance running performance among endurance athletes of similar V[Combining Dot Above]O2max levels. The purpose of this study was to examine the influence of unshod (barefoot) vs. shod (wearing shoes) running on RE (expressed as ml·kg·min) during three 5-minute submaximal running trials representing 65, 75, and 85% of V[Combining Dot Above]O2max. Other physiologic and perceptual variables such as respiratory exchange ratio, lactate, heart rate, and ratings of perceived exertion were also chosen as dependent variables. We measured V[Combining Dot Above]O2max in 14 recreationally active trained distance female runners (age = 27.6 ± 1.6 years; height = 163.3 ± 1.7 cm; weight = 57.8 ± 1.9 kg) who were completely inexperienced with unshod running. After initial testing, each subject was randomized to either unshod or shod for days 2 and 3. We analyzed the data with a 2-way (condition by intensity) repeated-measures analysis of variance. Submaximal oxygen consumption was significantly reduced at 85% of V[Combining Dot Above]O2max (p = 0.018), indicating an improvement in RE, but not during the 65% or 75% trials (p > 0.05, both). No other dependent measure was different between unshod and shod conditions. Our results indicate that the immediate improvement to RE while barefoot occurs at a relatively high fraction of maximal oxygen consumption. For the recreational or competitive distance runner, training or competing while barefoot may be a useful strategy to improve endurance performance.
authors.affiliation: 1Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky; 2Department of Kinesiology, Kansas State University, Manhattan, Kansas; and 3Department of Exercise Science and Health Promotion, Florida Atlantic University, Boca Raton, Florida.
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Berrones
authors.forename: Stephanie P
authors.initials: SP
authors.lastname: Kurti
authors.forename: Korey M
authors.initials: KM
authors.lastname: Kilsdonk
authors.forename: Delonyx J
authors.initials: DJ
authors.lastname: Cortez
authors.forename: Flavia F
authors.initials: FF
authors.lastname: Melo
authors.forename: Michael
authors.initials: M
authors.lastname: Whitehurst
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D005528:Foot / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D010101:Oxygen Consumption / Q000502:physiology*; D012420:Running / Q000502:physiology*; D012775:Shoes
chemical_list: D019344:Lactic Acid