Bailey Joshua, Mata Tiffany, Mercer John A
Department of Movement Sciences, University of Idaho, Moscow, ID, USA.
Department of Kinesiology & Nutrition Sciences, University of Nevada, Las Vegas, Las Vegas, NV, USA.
Int J Exerc Sci. 2017 Nov 1;10(7):1067-1075. doi: 10.70252/NRSU8209. eCollection 2017.
The purpose of the study was to compare the relationship between stride length (SL), stride frequency (SF), and velocity while running on a treadmill and overground. Participants (n=10; 22.3±2.6 yrs; 1.71±.08 m; 71.4±15.5 kg) completed a total of 14 runs (7 treadmill, 7 overground) with each run at a different velocity. SL, SF, and velocity data were recorded using wearable technology (Garmin, Fenix2). The outdoor trials occurred first. The treadmill velocities were selected to match the range of velocities used overgroud. SL vs. velocity plots were generated for treadmill and overground data for each participant and fit with a 2 order polynomial in the form of SL=Av+Bv+C. Each equation coefficient (i.e., A, B, C) was averaged across participants and compared between treadmill and overground using paired t-tests. The A coefficient (v term) was different treadmill vs. overground (p=0.031). Neither B (p=0.136) nor C (p=0.260) coefficients were different treadmill vs. overground. It was concluded that the A coefficient (v term) for SL vs. velocity was larger during overground vs. treadmill running. This is an indication that the strategy of changing SL across velocities was different when on the treadmill vs. overground. Specifically, while running on a treadmill, SL continued to increase in a more linear manner than when running overground.
本研究的目的是比较在跑步机上跑步和在地面上跑步时步长（SL）、步频（SF）与速度之间的关系。参与者（n = 10；年龄22.3±2.6岁；身高1.71±0.08米；体重71.4±15.5千克）总共完成了14次跑步（7次在跑步机上，7次在地面上），每次跑步速度不同。使用可穿戴技术（佳明，Fenix2）记录SL、SF和速度数据。首先进行户外试验。选择跑步机速度以匹配在地面上使用的速度范围。为每个参与者生成跑步机和地面数据的SL与速度图，并拟合为SL = Av + Bv + C形式的二阶多项式。每个方程系数（即A、B、C）在参与者之间进行平均，并使用配对t检验比较跑步机和地面之间的差异。A系数（v项）在跑步机和地面之间存在差异（p = 0.031）。B系数（p = 0.136）和C系数（p = 0.260）在跑步机和地面之间没有差异。得出的结论是，在地面跑步与跑步机跑步时，SL与速度关系的A系数（v项）在地面跑步时更大。这表明在跑步机上与在地面上时，跨速度改变SL的策略不同。具体而言，在跑步机上跑步时，SL比在地面上跑步时以更线性的方式持续增加。
