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Keywords: power output
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Journal Articles
J Exp Biol (2015) 218 (22): 3589–3595.
Published: 01 November 2015
... (force per muscle cross-sectional area) and maximal work loop power output (normalised to muscle mass) all significantly increased with greater SVL. In contrast, fatigue resistance during repeated work loops significantly decreased with SVL and there was no effect of size on tetanus activation time. When...
Journal Articles
J Exp Biol (2013) 216 (14): 2587–2594.
Published: 15 July 2013
..., which provides a realistic assessment of in vivo power output, has not previously been undertaken in mammals that undergo prolonged torpor during hibernation. In the present study, our aim was to assess the effects of 3 months of hibernation on contractile performance (using the work loop technique) and...
Journal Articles
J Exp Biol (2012) 215 (2): 324–330.
Published: 15 January 2012
...Natalie C. Holt; Graham N. Askew SUMMARY Asymmetric cycles with more than half of the cycle spent shortening enhance the mechanical power output of muscle during flight and vocalisation. However, strategies that enhance muscle mechanical power output often compromise efficiency. In order to...
Journal Articles
J Exp Biol (2010) 213 (21): 3710–3716.
Published: 01 November 2010
... power output stroke volume Anuran water turnover rates are approximately an order of magnitude greater than rates in other vertebrate groups in terrestrial environments ( Shoemaker and Nagy, 1977 ). Consequently, dehydration is a constant potential environmental stress. Species have varying...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2007) 210 (14): 2411–2418.
Published: 15 July 2007
... analyzed using videography to detail the kinematics in conjunction with a hydromechanical model to determine the power output ( P t ) and propulsive efficiency(η p ). Manatees swam at velocities of 0.06–1.14 m s –1 . Locomotion was accomplished by undulation of the body and caudal fluke. Undulatory...
Journal Articles
J Exp Biol (2006) 209 (13): 2535–2553.
Published: 01 July 2006
...A. Kristopher Lappin; Jenna A. Monroy; Jason Q. Pilarski; Eric D. Zepnewski; David J. Pierotti; Kiisa C. Nishikawa SUMMARY Ballistic tongue projection in toads is a remarkably fast and powerful movement. The goals of this study were to: (1) quantify in vivo power output and activity of the...
Journal Articles
J Exp Biol (2005) 208 (17): 3293–3302.
Published: 01 September 2005
... ground-dwelling birds such as phasianids. We hypothesized that by making use of elastic energy storage and release, the leg muscles could provide the large power outputs needed for achieving high velocities after takeoff. We investigated the performance of the leg muscles of the guinea fowl Numida...
Journal Articles
J Exp Biol (2005) 208 (15): 3003–3012.
Published: 01 August 2005
...Scott D. Kirkton; Jared A. Niska; Jon F. Harrison SUMMARY Developing vertebrates increase both their locomotory power output and endurance due to ontogenetic improvements in anaerobic and aerobic metabolic capacities. Do similar patterns hold for insect locomotion, or do longer tracheal lengths...
Journal Articles
J Exp Biol (2003) 206 (11): 1855–1865.
Published: 01 June 2003
... and mechanical power output. Pollen foragers had hovering metabolic rates approximately 10% higher than nectar foragers, regardless of the amount of load carried. Pollen foragers also had a more horizontal body position and higher inclination of stroke plane than measured previously for honey bees...
Journal Articles
J Exp Biol (2002) 205 (15): 2153–2160.
Published: 01 August 2002
...Graham N. Askew; Richard L. Marsh SUMMARY Take-off in birds at high speeds and steep angles of elevation requires a high burst power output. The mean power output of the pectoralis muscle of blue-breasted quail ( Coturnix chinensis ) during take-off is approximately 400 W kg -1 muscle, as...
Journal Articles
J Exp Biol (2002) 205 (8): 1145–1152.
Published: 15 April 2002
... output of the muscles at 6 Hz and the fatigue-resistance of force production at 2 Hz (other correlations between power and fatigue were negative but non-significant). Thus, our data support the suggestion that a physiological conflict between maximum power output and fatigue resistance exists at the...
Journal Articles
J Exp Biol (2001) 204 (21): 3587–3600.
Published: 01 November 2001
... vitro to the in vivo length and activity patterns, whilst measuring force. The net power output was only 80 W kg –1 because of a large artefact in the force record during lengthening. For more realistic estimates of the pectoralis power output, we ignored the power absorbed by the muscle bundles during...
Journal Articles
J Exp Biol (2001) 204 (21): 3601–3619.
Published: 01 November 2001
... kinetic energy. In addition, high-speed video recordings of the position of the wings over the course of the wing stroke, and morphological measurements, allowed us to calculate the aerodynamic and inertial power requirements. The total power output required from the pectoralis muscle was, on average, 390...
Journal Articles
J Exp Biol (2001) 204 (13): 2231–2238.
Published: 01 July 2001
... , where BL is total body length. Time from stimulus to 90% relaxation ( T 90 ) changed significantly with axial location, increasing from 203±11ms at 0.45 BL to 239±9ms at 0.75 BL . Fast muscle power outputs were measured using the work loop technique. Maximum power outputs at ±5% strain using optimal...
Journal Articles
J Exp Biol (1992) 166 (1): 33–46.
Published: 01 May 1992
... hydrodynamic models, those of Lighthill and Yates, to determine the mean thrust ( T ) and mean power output ( P ) at these swimming speeds ( U ) close to U ms . A large fish (‘Salmon’) and a small fish (‘Smolt’) were selected for analysis. For salmon using Lighthill's model, T =0.30N and P =0.26W, and using...
Journal Articles
J Exp Biol (1991) 158 (1): 325–342.
Published: 01 July 1991
... speeds, compared to previous estimates. Other aspects of power output, including the probable magnitude of inertial power, are considered in relation to published data. J. exp. Biol. 158, 325-342 (1991) 3 2 5 Printed in Great Britain © The Company of Biologists Limited 1991 DRAGONFLY FLIGHT: POWER...
Journal Articles
J Exp Biol (1987) 130 (1): 235–258.
Published: 01 July 1987
... predictions that maximum mass-specific power output and lift production should decrease with increasing body mass and wing disk loading. 13 3 1987 © 1987 by Company of Biologists 1987 flight lift power output flight muscle wing loading scaling birds bats insects J. exp. Biol. 130...