Tu, Michael S. and Dickinson, Michael H. (1994) Modulation of Negative Work Output from a Steering Muscle of the Blowfly Calliphora Vicina. Journal of Experimental Biology, 192 . pp. 207-224. ISSN 0022-0949 http://resolver.caltech.edu/CaltechAUTHORS:20120221-094249639
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Of the 17 muscles responsible for flight control in flies, only the first basalar muscle (b1) is known to fire an action potential each and every wing beat at a precise phase of the wing-beat period. The phase of action potentials in the b1 is shifted during turns, implicating the b1 in the control of aerodynamic yaw torque. We used the work loop technique to quantify the effects of phase modulation on the mechanical output of the b1 of the blowfly Calliphora vicina. During cyclic length oscillations at 10 and 50 Hz, the magnitude of positive work output by the b1 was similar to that measured previously from other insect muscles. However, when tested at wing-beat frequency (150 Hz), the net work performed in each cycle was negative. The twitch kinetics of the b1 suggest that negative work output reflects intrinsic specializations of the b1 muscle. Our results suggest that, in addition to a possible role as a passive elastic element, the phase-sensitivity of its mechanical properties may endow the b1 with the capacity to modulate wing-beat kinematics during turning maneuvers.
|Additional Information:||© 1994 The Company of Biologists Limited. Accepted 31 January 1994. This study was supported by a David and Lucille Packard Fellowship for Science and Engineering to M.H.D. and by NSF Grant IBN-0208765 to M.H.D.|
|Subject Keywords:||muscle mechanics, work, insect flight, Calliphora vicina, blowfly|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||22 Feb 2012 00:32|
|Last Modified:||26 Dec 2012 14:51|
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