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Six degree-of-freedom analysis of hip, knee, ankle and foot provides updated understanding of biomechanical work during human walking

Heesophia 添加于 2016-6-24 11:11 | 1294 次阅读 | 0 个评论

作者
Zelik KE, Takahashi KZ, Sawicki GS
摘要
Measuring biomechanical work performed by humans and other animals is critical for understanding muscle-tendon function, joint-specific contributions and energy-saving mechanisms during locomotion. Inverse dynamics is often employed to estimate joint-level contributions, and deformable body estimates can be used to study work performed by the foot. We recently discovered that these commonly used experimental estimates fail to explain whole-body energy changes observed during human walking. By re-analyzing previously published data, we found that about 25% (8 J) of total positive energy changes of/about the body\'s center-of-mass and >30% of the energy changes during the Push-off phase of walking were not explained by conventional joint- and segment-level work estimates, exposing a gap in our fundamental understanding of work production during gait. Here, we present a novel Energy-Accounting analysis that integrates various empirical measures of work and energy to elucidate the source of unexplained biomechanical work. We discovered that by extending conventional 3 degree-of-freedom (DOF) inverse dynamics (estimating rotational work about joints) to 6DOF (rotational and translational) analysis of the hip, knee, ankle and foot, we could fully explain the missing positive work. This revealed that Push-off work performed about the hip may be >50% greater than conventionally estimated (9.3 versus 6.0 J, P=0.0002, at 1.4 m s(-1)). Our findings demonstrate that 6DOF analysis (of hip-knee-ankle-foot) better captures energy changes of the body than more conventional 3DOF estimates. These findings refine our fundamental understanding of how work is distributed within the body, which has implications for assistive technology, biomechanical simulations and potentially clinical treatment.
详细资料
- 关键词: Adult; Ankle Joint/*physiology; Biomechanical Phenomena; Female; Foot/*physiology; Hip Joint/*physiology; Humans; Knee Joint/*physiology; Male; *Walking; Young Adult; Biomechanics; Foot work; Gait analysis; Inverse dynamics; Joint work; Mechanical work
- 文献种类: Journal Article
- 期刊名称: The Journal of Experimental Biology
- 期刊缩写: J Exp Biol
- 期卷页: 2015年第218卷第Pt 6期 876-886页
- 地址: Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, NC 27695, USA
- ISBN: 0022-0949
学科领域自然科学 » 数学
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