Distribution of the center of mass work and metabolism during stair climbing

LAN Jian; ZHANG Jiwen; FU Chenglong; CHEN Ken

doi:10.16511/j.cnki.qhdxxb.2020.26.017

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (11) : 934-942. DOI: 10.16511/j.cnki.qhdxxb.2020.26.017

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Distribution of the center of mass work and metabolism during stair climbing

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Abstract

The distribution of the center of mass (CoM) work and the metabolism are of great significance for studies of the mechanism of climbing stairs. This paper presents a stair climbing model, defines key parameters reflecting the distribution of the CoM work and metabolism and presents the mathematical relationships between these parameters and the vertical ground reaction force (VGRF). Tests and analyses show that the average power in a single leg is less than the average CoM work rate in one step during the double support and single support phases. During the double support phase, the work rates by the leading and trailing legs are nearly balanced with slightly more work done by the leading leg. The CoM work distribution has little effect on the VGRF curve shape but protects the knee joint during the single support phase. Analysis of the metabolism during the CoM work shows that walking upstairs naturally saves energy, but is not the most energy efficient method. The slightly concave shape of the VGRF curve reduces the probability of early ankle joint plantarflexion and excessive plantarflexion.

Key words

CoM work distribution / metabolism consumption / CoM work rate / ratio of average power / metabolic consumption ratio

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LAN Jian, ZHANG Jiwen, FU Chenglong, CHEN Ken. Distribution of the center of mass work and metabolism during stair climbing[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(11): 934-942 https://doi.org/10.16511/j.cnki.qhdxxb.2020.26.017

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