# lect5 - Biology 427 Biomechanics Lecture 5. Terrestrial...

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Biology 427 Biomechanics Lecture 5. Terrestrial locomotion II: mechanical analysis of gaits and jumpiness. • Recap: gaits and ballistic walking • When the Froude Number (V 2 /g L) is greater than 1, simple ballistic walking is no longer possible. • The jumper model accounts for an airborne phase of movement. • Calculating optimal gaits for energy expenditure Simple Quantifiers of Movement on Land V 2 = a R V 2 < g L < g L R g Froude number (Fr)= V 2 /gL “Ballistic Waking” Modifiers of the radius of curvature Lumbar flexion Pelvic rotation Pelvic tilt Plantar flexion

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10 5 2 1 0.1 0.5 1 2 5 10 20 Froude = V 2 / g L Relative Stride Length S/L S L V 2 / g l > 1! / g l > 1! The jumper: for speeds greater than Fr = 1, gait must change with an airborne phase
The jumper: for speeds greater than Fr = 1, gait must change with an airborne phase M m h d a b V Assume constant V no air resistance no skidding gait: jumpiness = j = b/a Goal: compute the power (rate of energy expenditure) as a function of size ( M,m ) and gait ( j = b/a )

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## This note was uploaded on 06/03/2008 for the course BIOL 427 taught by Professor Daniels during the Spring '08 term at University of Washington.

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lect5 - Biology 427 Biomechanics Lecture 5. Terrestrial...

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