期刊
JOURNAL OF APPLIED BIOMECHANICS
卷 32, 期 4, 页码 365-372出版社
HUMAN KINETICS PUBL INC
DOI: 10.1123/jab.2015-0183
关键词
kinematics; kinetics; modeling; force
资金
- Graduate Student Research, Service, and Educational Leadership Grant
Achilles tendon (AT) injuries are common in runners. The AT withstands high magnitudes of stress during running which may contribute to injury. Our purpose was to examine the effects of foot strike pattern and step frequency on AT stress and strain during running utilizing muscle forces based on a musculoskeletal model and subject-specific ultrasound-derived AT cross-sectional area. Nineteen female runners performed running trials under 6 conditions, including rearfoot strike and forefoot strike patterns at their preferred cadence, +5%, and -5% preferred cadence. Rearfoot strike patterns had less peak AT stress (P<.001), strain (P<.001), and strain rate (P<.001) compared with the forefoot strike pattern. A reduction in peak AT stress and strain were exhibited with a +5% preferred step frequency relative to the preferred condition using a rearfoot (P<.001) and forefoot (P=.005) strike pattern. Strain rate was not different (P>.05) between step frequencies within each foot strike condition. Our results suggest that a rearfoot pattern may reduce AT stress, strain, and strain rate. Increases in step frequency of 5% above preferred frequency, regardless of foot strike pattern, may also lower peak AT stress and strain.
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