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J Exp Biol (2021) 224 (1): jeb235614.
Published: 12 January 2021
...Anthony L. Hessel; Brent J. Raiteri; Michael J. Marsh; Daniel Hahn ABSTRACT Much of our understanding of in vivo skeletal muscle properties is based on studies performed under maximal activation, which is problematic because muscles are rarely activated maximally during movements such as walking...
Includes: Supplementary data
J Exp Biol (2020) 223 (23): jeb228882.
Published: 7 December 2020
...Vladimir A. Vityazev; Jan E. Azarov ABSTRACT The activation sequence of the ventricular myocardium in ectotherms is a matter of debate. We studied the correlation between the ventricular activation sequence and the pattern of local stretches in 13 toads ( Bufo bufo ). Epicardial potential mapping...
Includes: Supplementary data
In collection:Comparative biomechanics of movement
J Exp Biol (2018) 221 (21): jeb187260.
Published: 5 November 2018
... the nature of the relationship between the distribution of activation and the distribution of force-generating capacity among the three heads of the triceps surae [soleus (SOL), gastrocnemius medialis (GM) and gastrocnemius lateralis (GL)]. Twenty volunteers performed isometric plantarflexions, during which...
J Exp Biol (2014) 217 (19): 3528–3534.
Published: 1 October 2014
...Ollie M. Blake; James M. Wakeling Animals produce rapid movements using fast cyclical muscle contractions. These types of movements are better suited to faster muscle fibres within muscles of mixed fibre types as they can shorten at faster velocities and achieve higher activation–deactivation rates...
J Exp Biol (2013) 216 (2): 198–207.
Published: 15 January 2013
... be recruited. Faster motor units have faster activation–deactivation rates than slower motor units, and they contract at higher strain rates; therefore, recruitment of faster motor units may be advantageous for tasks that involve rapid movements or high rates of work. This study identified motor unit...
J Exp Biol (2012) 215 (5): 723–730.
Published: 1 March 2012
...M. Rockwell Parker; Robert T. Mason SUMMARY Vertebrates indicate their genetic sex to conspecifics using secondary sexual signals, and signal expression is often activated by sex hormones. Among vertebrate signaling modalities, the least is known about how hormones influence chemical signaling. Our...
J Exp Biol (2012) 215 (2): 324–330.
Published: 15 January 2012
... loop skeletal muscle power output initial efficiency activation heat production locomotion Muscle length trajectory is a major determinant of muscle mechanical power output ( Josephson, 1985 ; Altringham and Johnston, 1990 ; Askew and Marsh, 1997 ; Girgenrath and Marsh, 1999 ). In many...
Philip Brownridge, Luciane Vieira de Mello, Mary Peters, Lynn McLean, Amy Claydon, Andrew R. Cossins, Phillip D. Whitfield, Iain S. Young
J Exp Biol (2009) 212 (2): 184–193.
Published: 15 January 2009
.... and Hollingworth, S. ( 1998 ). Model of sarcomeric Ca 2+ movements, including ATP Ca 2+ binding and diffusion, during activation of frog skeletal muscle. J. Gen. Physiol. 112 , 297 -316. Benzonan, G., Capony, J. P. and Pechere, J. F. ( 1972 ). Binding of calcium to muscular parvalbumins. Biochim. Biophys...
J Exp Biol (2006) 209 (12): 2276–2292.
Published: 15 June 2006
... in adaptation by domains of cytoplasm along a myofibre; serve researchers, through a marker role, as `clues' to various activities of muscle; are `connectors' that physically, and through signalling and cell-fibre communications, bridge myofibres to the intra- and extra-muscular environment; and are equipped...
Yukio Okada, Kotapola G. Imendra, Toshihiro Miyazaki, Hitoshi Hotokezaka, Rie Fujiyama, Jorge L. Zeredo, Takenori Miyamoto, Kazuo Toda
J Exp Biol (2005) 208 (24): 4747–4756.
Published: 15 December 2005
... (0.5 mmol l –1 ), but not affected by internal GDPβS (1 mmol l -1 ). The voltage of half-maximum ( V 1/2 )activation was –46 mV in both perforated and conventional modes. V 1/2 of inactivation was –80 mV in perforated mode and –86 mV in conventional mode. Internal GTPγS (0.5 mmol l –1 ) shifted the V 1...
J Exp Biol (2005) 208 (16): 3055–3063.
Published: 15 August 2005
... in the half-inactivation and a negative shift in the half-activation potentials for the sodium current, accompanied by a slowing of the rate of inactivation to half of the experimentally observed values. This suggests that once-only spiking can be attributed to the steady-state values of activation...
J Exp Biol (2001) 204 (24): 4249–4257.
Published: 15 December 2001
... was predicted. Subsequent experiments revealed that bass rostral white muscle showed faster rates of activation and relaxation than more caudal muscle, as has been observed in white muscle of other fish species. Rostral–caudal variations in white muscle protein composition and contractile properties...