We would like to thank Dr Kram and Mr Franz for their comments regarding our study on the oxygen cost of barefoot running. Our research showed that in 10 recreational male and female runners, VO_2, heart rate (HR) and rating of perceived exertion (RPE) were all significantly lower in the barefoot compared to shod conditions. Though not significant, we also saw 5.7% higher VO_2 overground and 2.0% on the treadmill in the tested runners. This was the first study to our knowledge that has investigated barefoot running on an overground track. Previous studies have used either a treadmill or a short runway across a force plate in a laboratory setting.
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