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Glen A Lichtwark on Muck Rack

Glen A Lichtwark

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Articles

Postural adaptations may contribute to the unique locomotor energetics seen in hopping kangaroos

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By Lauren Thornton, Taylor Dick, John Hutchinson Verified, Glen A Lichtwark
| eLife
eLife Assessment This valuable biomechanical analysis of kangaroo kinematics and kinetics across a range of hopping speeds and masses is a step towards understanding a long-standing problem in locomotion biomechanics: the mechanism for how kangaroos, unlike other mammals, can increase hopping speed without a concomitant increase in metabolic cost. The authors convincingly demonstrate that changes in kangaroo posture with speed increase tendon stress/strain and hence elastic energy storage/return.
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Cycling Cadence Selections at Different Saddle Heights Minimize Muscle Activation Rather Than Energy Cost

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By Cristian Riveros-Matthey, Mark Connick, Glen A Lichtwark, Timothy Carroll
| BioRxiv
Abstract Unlike walking and running, people do not consistently choose cadences that minimize energy consumption when cycling. Assuming a common objective function for all forms of locomotion, this suggests either that the neural control system relies on indirect sensorimotor cues to energetic cost that are approximately accurate during walking but not cycling, or that an alternative objective function applies that correlates with energy expenditure in walking but not cycling.
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Using physiologically-based models to predict in vivo skeletal muscle energetics

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By Ryan N. Konno, Glen A Lichtwark, Taylor Dick
| BioRxiv
Abstract Understanding how muscles use energy is essential for elucidating the role of skeletal muscle in animal locomotion. Yet, experimental measures of in vivo muscle energetics are challenging to obtain, so physiologically-based muscle models are often used to estimate energy use. These predictions of individual muscle energy expenditure are not often compared to indirect whole body measures of energetic cost.
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