| Autor: |
Fuller, Joel T., Buckley, Jonathan D., Tsiros, Margarita D., Brown, Nicholas A. T., Thewlis, Dominic |
| Předmět: |
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| Zdroj: |
Journal of Athletic Training (Allen Press); Oct2016, Vol. 51 Issue 10, p806-812, 7p, 1 Diagram, 2 Graphs |
| Abstrakt: |
Context: Minimalist shoes have been suggested as a way to alter running biomechanics to improve running performance and reduce injuries. However, to date, researchers have only considered the effect of minimalist shoes at slow running speeds. Objective: To determine if runners change foot-strike pattern and alter the distribution of mechanical work at the knee and ankle joints when running at a fast speed in minimalist shoes compared with conventional running shoes. Design: Crossover study. Setting: Research laboratory. Patients or Other Participants: Twenty-six trained runners (age=30.0 6 7.9 years [age range, 18-40 years], height=1.79 6 0.06 m, mass = 75.3 6 8.2 kg, weekly training distance = 27 6 15 km) who ran with a habitual rearfoot foot-strike pattern and had no experience running in minimalist shoes. Intervention(s): Participants completed overground running trials at 18 km/h in minimalist and conventional shoes. Main Outcome Measure(s): Sagittal-plane kinematics and joint work at the knee and ankle joints were computed using 3-dimensional kinematic and ground reaction force data. Footstrike pattern was classified as rearfoot, midfoot, or forefoot strike based on strike index and ankle angle at initial contact. Results: We observed no difference in foot-strike classification between shoes (v2 1=2.29, P=.13). Ankle angle at initial contact was less (2.468 versus 7.438; t25 = 3.34, P = .003) and strike index was greater (35.97% versus 29.04%; t25=2.38, P= .03) when running in minimalist shoes compared with conventional shoes. We observed greater negative (52.87 J versus 42.46 J; t24 = 2.29, P = .03) and positive work (68.91 J versus 59.08 J; t24=2.65, P=.01) at the ankle but less negative (59.01 J versus 67.02 J; t24= 2.25, P= .03) and positive work (40.37 J versus 47.09 J; t24 = 2.11, P = .046) at the knee with minimalist shoes compared with conventional shoes. Conclusions: Running in minimalist shoes at a fast speed caused a redistribution of work from the knee to the ankle joint. This finding suggests that runners changing from conventional to minimalist shoes for short-distance races could be at an increased risk of ankle and calf injuries but a reduced risk of knee injuries. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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