Universität zu Köln

Guschlbauer, Christoph ORCID: 0000-0002-1817-5883, Hooper, Scott L., Mantziaris, Charalampos ORCID: 0000-0003-2280-1733, Schwarz, Anna ORCID: 0000-0003-3825-5538, Szczecinski, Nicholas S. and Büschges, Ansgar ORCID: 0000-0003-2123-1900 (2022). Correlation between ranges of leg walking angles and passive rest angles among leg types in stick insects. Current Biology, 32 (10). 2334 - 2345. CAMBRIDGE: CELL PRESS. ISSN 1879-0445

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Abstract

Because of scaling issues, passive muscle and joint forces become increasingly important as limb size decreases.(1-3) In some small limbs, passive forces can drive swing in locomotion,(4,5) and antagonist passive torques help control limb swing velocity.(6) In stance, minimizing antagonist muscle and joint passive forces could save energy. These considerations predict that, for small limbs, evolution would result in the angle range over which passive forces are too small to cause limb movement (called resting-state range in prior insect work(4) and area of neutral equilibrium in physics and engineering) correlating with the limb's typical working range, usually that in locomotion. We measured the most protracted and retracted thorax-femur (ThF) angles of the pro- (front), meso- (middle), and metathoracic (hind) leg during stick insect (Carausius morosus) walks. This ThF working range differed in the three leg types, being more posterior in more posterior legs. In other experiments, we manually protracted or retracted the denervated front, middle, and hind legs. Upon release, passive forces moved the leg in the opposite direction (retraction or protraction) until it reached the most protracted or most retracted edge of the ThF resting-state range. The ThF resting-state angle ranges correlated with the leg-type working range, being more posterior in more posterior legs. The most protracted ThF walking angles were more retracted than the post-protraction ThF angles, and the most retracted ThF walking angles were similar to the postretraction ThF angles. These correlations of ThF working- and resting-state ranges could simplify motor control and save energy. These data also provide an example of evolution altering behavior by changing passive muscle and joint properties.(7)

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Guschlbauer, Christoph UNSPECIFIED orcid.org/0000-0002-1817-5883 UNSPECIFIED Hooper, Scott L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mantziaris, Charalampos UNSPECIFIED orcid.org/0000-0003-2280-1733 UNSPECIFIED Schwarz, Anna UNSPECIFIED orcid.org/0000-0003-3825-5538 UNSPECIFIED Szczecinski, Nicholas S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Büschges, Ansgar UNSPECIFIED orcid.org/0000-0003-2123-1900 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-677123
DOI:	10.1016/j.cub.2022.04.013
Journal or Publication Title:	Current Biology
Volume:	32
Number:	10
Page Range:	2334 - 2345
Date:	2022
Publisher:	CELL PRESS
Place of Publication:	CAMBRIDGE
ISSN:	1879-0445
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Biology > Zoologisches Institut
Subjects:	Life sciences
Uncontrolled Keywords:	Keywords Language INVERTEBRATE MUSCLES; NEURAL-CONTROL; CARAUSIUS; MOVEMENTS; FORCES; WRIST; PARAMETERS; RESPONSES; PATTERNS; POSTURE Multiple languages Biochemistry & Molecular Biology; Biology; Cell Biology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/67712