GIBD (Grupo de Investigación en Biomecánica aplicada al Deporte), Universidad de Valencia, Spain.
Gait Posture. 2013 Sep;38(4):929-33. doi: 10.1016/j.gaitpost.2013.04.026. Epub 2013 Jun 5.
The differences produced when running on a treadmill vs overground may call into question the use and validity of the treadmill as a piece of equipment commonly used in research, training, and rehabilitation. The aim of the present study was to analyze under pre/post fatigue conditions the effect of treadmill vs overground on plantar pressures. Twenty-seven recreational runners (17 men and 10 women) ran on a treadmill and overground at two speeds: S1=3.33 m/s and S2=4.00 m/s, before and after a fatigue protocol consisting of a 30-min run at 85% of their individual maximal aerobic speed (MAS). Contact time (CT in seconds), peak pressure (PP in kPa), and relative load (RL in %) were analyzed under nine foot zones of the left foot using an in-shoe plantar pressure device. A two-way repeated measures ANOVA showed that running on a treadmill increases CT (7.70% S1 and 9.91% S2), modifies the pressure distribution and reduces PP (25.98% S1 and 31.76% S2), especially under the heel, medial metatarsals, and hallux, compared to running overground. Moreover, on both surfaces, fatigue (S2) led to a reduced stride frequency (2.78%) and reduced PP on the lateral heel and hallux (15.96% and 16.35%, respectively), and (S1) increased relative load on the medial arch (9.53%). There was no significant interaction between the two factors analyzed (surface and fatigue). Therefore, the aforementioned surface effect, which occurs independently of the fatigue state, should be taken into account when interpreting the results of studies that use the treadmill in their experimental protocols, and when prescribing physical exercise on a treadmill.
在跑步机上和在地面上跑步时产生的差异可能会使人们质疑跑步机作为一种在研究、训练和康复中常用的设备的使用和有效性。本研究的目的是在疲劳前后条件下分析跑步机和地面跑步对足底压力的影响。27 名休闲跑步者（17 名男性和 10 名女性）以两种速度在跑步机和地面上跑步：S1=3.33 m/s 和 S2=4.00 m/s，然后进行疲劳协议，即在 85%个体最大有氧速度（MAS）下跑步 30 分钟。使用足底压力装置，在左脚的九个足部区域下分析接触时间（CT，以秒为单位）、峰值压力（PP，以 kPa 为单位）和相对负荷（RL，以%为单位）。双因素重复测量方差分析显示，与在地面上跑步相比，在跑步机上跑步会增加 CT（S1 增加 7.70%，S2 增加 9.91%），改变压力分布并降低 PP（S1 降低 25.98%，S2 降低 31.76%），尤其是在脚跟、内侧跖骨和大脚趾下。此外，在两种表面上，疲劳（S2）会导致步频降低（2.78%），并且外侧脚跟和大脚趾的 PP 降低（分别为 15.96%和 16.35%），而（S1）则会增加内侧足弓的相对负荷（9.53%）。两种分析因素（表面和疲劳）之间没有显著的相互作用。因此，当使用跑步机的实验方案解释研究结果并规定在跑步机上进行体育锻炼时，应该考虑到这种独立于疲劳状态的表面效应。
