Why do Large Animals Never Actuate Their Jumps with Latch-Mediated Springs? Because They can Jump Higher Without Them
| Autor: | Mark Ilton, Emanuel Azizi, Jeffrey P. Olberding, Sheila N. Patek, Gregory P. Sutton, Elizabeth Mendoza, Sarah J. Longo |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
S3 Playing with Power: Mechanisms of Energy Flow in Organismal Movement
Work (physics) Crossover Plant Science Mechanics medicine.disease_cause Muscle work Models Biological Biomechanical Phenomena Computer Science::Robotics Kinetics Jumping Available energy medicine Jump Animals AcademicSubjects/SCI00960 Animal Science and Zoology medicine.symptom Corrigendum Locomotion Mathematics Muscle contraction Muscle Contraction |
| Zdroj: | Integrative and Comparative Biology |
| ISSN: | 1557-7023 1540-7063 |
| Popis: | As animals get smaller, their ability to generate usable work from muscle contraction is decreased by the muscle’s force–velocity properties, thereby reducing their effective jump height. Very small animals use a spring-actuated system, which prevents velocity effects from reducing available energy. Since force–velocity properties reduce the usable work in even larger animals, why don’t larger animals use spring-actuated jumping systems as well? We will show that muscle length–tension properties limit spring-actuated systems to generating a maximum one-third of the possible work that a muscle could produce—greatly restricting the jumping height of spring-actuated jumpers. Thus a spring-actuated jumping animal has a jumping height that is one-third of the maximum possible jump height achievable were 100% of the possible muscle work available. Larger animals, which could theoretically use all of the available muscle energy, have a maximum jumping height that asymptotically approaches a value that is about three times higher than that of spring-actuated jumpers. Furthermore, a size related “crossover point” is evident for these two jumping mechanisms: animals smaller than this point can jump higher with a spring-actuated mechanism, while animals larger than this point can jump higher with a muscle-actuated mechanism. We demonstrate how this limit on energy storage is a consequence of the interaction between length–tension properties of muscles and spring stiffness. We indicate where this crossover point occurs based on modeling and then use jumping data from the literature to validate that larger jumping animals generate greater jump heights with muscle-actuated systems than spring-actuated systems. |
| Databáze: | OpenAIRE |
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