Campus Universitario, Universidad San Jorge, Autov A23 km 299, Villanueva de Gállego, 50830 Zaragoza, Spain.
Department of Physical Education and Sport, University of Granada, 18016 Granada, Spain.
Sensors (Basel). 2022 Jun 26;22(13):4828. doi: 10.3390/s22134828.
Several studies have already analysed power output in running or the relation between VO2max and power production as factors related to running economy; however, there are no studies assessing the difference in power output between shod and barefoot running. This study aims to identify the effect of footwear on the power output endurance runner. Forty-one endurance runners (16 female) were evaluated at shod and barefoot running over a one-session running protocol at their preferred comfortable velocity (11.71 ± 1.07 km·h−1). The mean power output (MPO) and normalized MPO (MPOnorm), form power, vertical oscillation, leg stiffness, running effectiveness and spatiotemporal parameters were obtained using the Stryd™ foot pod system. Additionally, footstrike patterns were measured using high-speed video at 240 Hz. No differences were noted in MPO (p = 0.582) and MPOnorm (p = 0.568), whereas significant differences were found in form power, in both absolute (p = 0.001) and relative values (p < 0.001), running effectiveness (p = 0.006), stiffness (p = 0.002) and vertical oscillation (p < 0.001). By running barefoot, lower values for contact time (p < 0.001) and step length (p = 0.003) were obtained with greater step frequency (p < 0.001), compared to shod running. The prevalence of footstrike pattern significantly differs between conditions, with 19.5% of runners showing a rearfoot strike, whereas no runners showed a rearfoot strike during barefoot running. Running barefoot showed greater running effectiveness in comparison with shod running, and was consistent with lower values in form power and lower vertical oscillation. From a practical perspective, the long-term effect of barefoot running drills might lead to increased running efficiency and leg stiffness in endurance runners, affecting running economy.
已有多项研究分析了跑步时的功率输出或 VO2max 与功率产生之间的关系，这些因素与跑步经济性有关；然而，目前尚无研究评估穿鞋和赤脚跑步时的功率输出差异。本研究旨在确定鞋类对耐力跑者的功率输出的影响。41 名耐力跑者（16 名女性）在其舒适速度（11.71 ± 1.07 km·h−1）下进行了单次跑步测试，评估他们在穿鞋和赤脚跑步时的功率输出。使用 Stryd™ 足底 pod 系统获得平均功率输出（MPO）和归一化 MPO（MPOnorm）、功率形式、垂直摆动、腿部刚度、跑步效率和时空参数。此外，使用 240 Hz 的高速摄像机测量足触地模式。在 MPO（p = 0.582）和 MPOnorm（p = 0.568）方面没有差异，而在功率形式方面，无论是绝对值（p = 0.001）还是相对值（p < 0.001）、跑步效率（p = 0.006）、刚度（p = 0.002）和垂直摆动（p < 0.001）方面都有显著差异。赤脚跑步时，与穿鞋跑步相比，接触时间（p < 0.001）和步长（p = 0.003）的数值更低，而步频（p < 0.001）更高。与穿鞋跑步相比，赤脚跑步的足触地模式明显不同，19.5%的跑者为后足着地，而赤脚跑步时没有跑者为后足着地。与穿鞋跑步相比，赤脚跑步的跑步效率更高，与功率形式和垂直摆动的数值更低相一致。从实际的角度来看，赤脚跑步训练的长期影响可能会提高耐力跑者的跑步效率和腿部刚度，从而影响跑步经济性。
