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Keywords: acceleration
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Journal Articles
J Exp Biol (2021) 224 (14): jeb242397.
Published: 26 July 2021
... acceleration revealed that spontaneous activity, inferred as the variance of external acceleration (VAR m ), was low and invariant in hypoxia. Warming (21 to 31°C) caused progressive tachycardia with no differences in f H between holding conditions. Mean VAR m was, however, significantly higher in the tank...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (15): jeb182303.
Published: 1 August 2018
... progression in acceleration, has proved valuable in the estimation of the metabolic cost of speed-changing gaits. However, its use with steep slopes requires extrapolation of the experimental cost versus gradient function for constant running speed, resulting in less-reliable estimates. The present study...
Journal Articles
J Exp Biol (2018) 221 (12): jeb175372.
Published: 19 June 2018
... of their plantigrade posture or due to adaptations to their Arctic marine existence. To evaluate whether polar bears are representative of terrestrial ursids or distinctly uneconomical walkers, this study measured the mass-specific metabolism, overall dynamic body acceleration, and gait kinematics of polar bears...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (2): jeb167262.
Published: 29 January 2018
... copepods, Anomalocera patersoni and Pontella mediterranea , and one pelagic calanoid copepod, Calanus helgolandicus ( euxinus ). We show that jumping out of the water does not happen just by inertia gained during the copepod's acceleration underwater, but also requires the force generated by the thoracic...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (22): 4252–4260.
Published: 15 November 2017
... frequently when walking and any acceleration requires net positive ankle work. The present study unveiled how the muscle–tendon interaction of human ankle plantar flexors are adjusted and integrated with body mechanics to provide net positive work during accelerative walking. We found that for accelerative...
Journal Articles
J Exp Biol (2016) 219 (19): 3100–3105.
Published: 1 October 2016
.... Biomechanics Locomotion Hydrodynamics Fineness ratio Acceleration Predator–prey interactions References Abrahams , M. V. and Kattenfeld , M. G. ( 1997 ). The role of turbidity as a constraint on predator-prey interactions in aquatic environments . Behav. Ecol. Sociobiol.   40...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (11): 1618–1624.
Published: 1 June 2016
... are increasingly employed for this purpose, their application in small-bodied animals has been limited by weight restrictions. Additionally, accelerometers engender novel complications, as a system is needed to reliably map acceleration to behaviors. In this study, we describe newly developed, tiny acceleration...
Journal Articles
J Exp Biol (2015) 218 (22): 3700–3709.
Published: 1 November 2015
... and can be enhanced by a trigger and catch mechanism for small loads. Muscle–tendon system Elastic energy Power amplification Catch mechanism Acceleration Jumping The mechanical output of skeletal muscle is bound by an intrinsic power limit, defined by the force–velocity properties...
Journal Articles
J Exp Biol (2015) 218 (9): 1419–1432.
Published: 1 May 2015
... accelerations. We quantified behavioral responses of individual larvae to local instantaneous flows using two-phase, infrared particle-image velocimetry. Both high dissipation rates and high wave-generated accelerations induced most larvae to swim faster upward. High dissipation rates also induced some rapid...
Journal Articles
J Exp Biol (2014) 217 (14): 2449–2455.
Published: 15 July 2014
... obtain: (6) or, in the frequency domain and for a given single frequency: (7) so: (8) Calculating pressure and acceleration magnitudes for a frequency of 20 Hz produced results that did not satisfy these relationships: the magnitude of was not equal to the wave number...
Journal Articles
J Exp Biol (2013) 216 (8): 1458–1469.
Published: 15 April 2013
... and acceleration α. In calm water most larvae had near-zero vertical velocities despite propelling themselves upward (swimming). In stronger turbulence all larvae used more propulsive force, but relative to the larval axis, larvae propelled themselves downward (diving) instead of upward more frequently and more...
Journal Articles
J Exp Biol (2012) 215 (23): 4115–4124.
Published: 1 December 2012
..., an acceleration peak produced by the legs contributed to 85±1% of the whole-body resultant acceleration in finch and 77±6% in dove. At lift-off, coincident with the start of the first downstroke, the percentage of hindlimb contribution to initial flight velocity was 93.6±0.6% in finch and 95.2±0.4% in dove...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (23): 4104–4114.
Published: 1 December 2012
... ( angierobertson2010@gmail.com ) 22 5 2012 15 8 2012 © 2012. 2012 bird acceleration maneuver To fly effectively, a bird must successfully coordinate the muscles that move its wings. The musculature of bird wings is complex both in anatomy and in function ( Dial, 1992a ; Hudson et al...
Journal Articles
J Exp Biol (2012) 215 (21): 3685–3692.
Published: 1 November 2012
... patagonicus ) at the Crozet Archipelago, Indian Ocean. We used partial dynamic body acceleration (PDBA) to quantify body movement during dive and estimate diving cost. During the initial part of the descent, older birds exerted more effort for a given speed but younger penguins worked harder in relation...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (3): 442–453.
Published: 1 February 2012
...Eric J. McElroy; Kristen L. Archambeau; Lance D. McBrayer SUMMARY Burst locomotion is thought to be closely linked to an organism's ability to survive and reproduce. During the burst, animals start from a standstill and then rapidly accelerate to near-maximum running speeds. Many previous studies...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (1): 135–140.
Published: 1 January 2012
... Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan † Author for correspondence ( koshio@aori.u-tokyo.ac.jp ) 4 10 2011 © 2012. 2012 dive path acceleration Aptenodytes forsteri Breath-holding divers are always in a dilemma during...
Journal Articles
J Exp Biol (2011) 214 (17): 2973–2987.
Published: 1 September 2011
... altered the body density and mass of three free-ranging elephant seals by remotely detaching weights and floats while monitoring their swimming speed, depth and three-axis acceleration with a high-resolution data logger. Cross-validation of three methods for estimating body density from hydrodynamic...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (10): 1763–1772.
Published: 15 May 2011
...Rebecca M. Walter; David R. Carrier SUMMARY The ability of a quadruped to apply propulsive ground reaction forces (GRF) during rapid acceleration may be limited by muscle power, foot traction or the ability to counteract the nose-up pitching moment due to acceleration. Because the biomechanics...
Journal Articles
J Exp Biol (2011) 214 (10): 1685–1691.
Published: 15 May 2011
... ( Sceloporus woodi ), we compared how swing- and stance-phase muscles relate to maximum running speed and acceleration. We employed both a level and vertical trackway to elicit ecologically relevant locomotor performance. Six individuals were filmed at 250 frames s –1 in lateral view. Following performance...
Journal Articles
J Exp Biol (2010) 213 (21): 3748–3759.
Published: 1 November 2010
... of the longfin squid ( Loligo pealeii ) using near-field acoustic and shaker-generated acceleration stimuli. Sound field pressure and particle motion components were measured from 30 to 10,000 Hz and acceleration stimuli were measured from 20 to 1000 Hz. Responses were determined using auditory evoked potentials...
Includes: Supplementary data