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The effects of gait strategy on metabolic rate and indicators of stability during downhill walking

Monsch, E.D., Franz, C.O., Dean, J.C.·2012·Journal of Biomechanics
DOI 10.1016/j.jbiomech.2012.05.024
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Abstract

When walking at a given speed, humans often appear to prefer gait patterns that minimize metabolic rate, thereby maximizing metabolic economy. However, recent experiments have demonstrated that humans do not maximize economy when walking downhill. The purpose of this study was to investigate whether this non-metabolically optimal behavior is the result of a trade-off between metabolic economy and gait stability. We hypothesized that humans have the ability to modulate their gait strategy to increase either metabolic economy or stability, but that increase in one measure will be accompanied by decrease in the other. Subjects walked downhill using gait strategies ranging from risky to conservative, which were either prescribed by verbal instructions or induced by the threat of perturbations. We quantified spatiotemporal gait characteristics, metabolic rate and several indicators of stability previously associated with fall risk: stride period variability; step width variability; Lyapunov exponents; Floquet multipliers; and stride period fractal index. When subjects walked using conservative gait strategies, stride periods and lengths decreased, metabolic rate increased, and anteroposterior maximum Lyapunov exponents increased, which has previously been interpreted as an indicator of decreased stability. These results do not provide clear support for the proposed trade-off between economy and stability, particularly when stability is approximated using complex metrics. However,…

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  • When walking downhill, humans do not select a gait pattern that minimizes COT.

    “More recently, it has been discovered that when walking downhill, humans do not select a gait pattern that minimizes COT.”

    From Preferred walking speed on rough terrain: is it all about energetics? (2019) · cites this paper as Monsch et al. (2012)

  • Simply minimizing COT does not fully represent the human objective function for walking speed.

    “In summary, based on both the current findings, which show a difference between the speed that minimizes the COT and the preferred speed on rough terrain, and previous research (Brown et al., 2002;Clark-Carter et al., 1986;Monsch et al., 2012;Schniepp et al., 2014), it seems that simply minimizing COT does not fully represent the human objective function for walking speed.”

    From Preferred walking speed on rough terrain: is it all about energetics? (2019) · cites this paper as Monsch et al., 2012

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Metadata

Authors
Monsch, E. D., Franz, C. O., & Dean, J. C.
Venue
Journal of Biomechanics
Publisher
Elsevier BV
Published
2012-07
Volume
45
Issue
11
Pages
1928-1933
ISSN
0021-9290
DOI
10.1016/j.jbiomech.2012.05.024
Cited by
35
References
0
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)

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