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Keywords: skeletal muscle
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J Exp Biol (2022) 225 (16): jeb243584.
Published: 16 August 2022
... al., 1994 ), and divided by the product of muscle fiber length ( L f ) and the density of mammalian skeletal muscle (1.06 g cm −3 ; Sacks and Roy, 1982 ). Brynnel et al. (2018) reported that fiber and muscle lengths ( L f ) were ∼13.5% longer in Ttn Δ112-158 muscles. However, the fiber length...
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J Exp Biol (2022) 225 (12): jeb243730.
Published: 20 June 2022
... behavior even when levels of testosterone are low in the bloodstream. One idea is that select tissues make their own androgens from scratch to support behavioral performance. We first studied this phenomenon in the skeletal muscles that actuate elaborate sociosexual displays in downy woodpeckers and two...
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J Exp Biol (2020) 223 (22): jeb230896.
Published: 23 November 2020
... by skeletal muscle during locomotion, results in significant unidirectional flow of CSF ( Olstad et al., 2019 ). With the evolution of tetrapods, some of the axial musculature that originally functioned in locomotion evolved into ventilatory systems ( Boggs, 2002 ; Perry et al., 2010 ). Although only studied...
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J Exp Biol (2020) 223 (21): jeb225839.
Published: 12 November 2020
... increases net power. Pectoralis major Work loop Skeletal muscle Bird flight Flying animals routinely perform locomotor behaviors that require adjustments to the aerodynamic force they produce. Behaviors such as accelerating and decelerating, maneuvering, changing altitude or carrying...
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J Exp Biol (2020) 223 (19): jeb224410.
Published: 7 October 2020
... Muscle mass Muscle mechanics Mechanical work Skeletal muscle Summary: Adding mass to rat plantaris muscle decreases mechanical work per cycle during cyclic contractions. © 2020. Published by The Company of Biologists Ltd 2020 http://www.biologists.com/user-licence-1-1/ 3 3...
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J Exp Biol (2020) 223 (16): jeb228304.
Published: 26 August 2020
... cascade Phenotypic plasticity Skeletal muscle Phenotypic plasticity is the ability of an organism with a given genotype to express environmentally mediated alternative phenotypes ( Travis, 1994 ; West-Eberhard, 2003 ). Alternative phenotypes can occur in response to different developmental...
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J Exp Biol (2020) 223 (2): jeb197038.
Published: 27 January 2020
... (muscular dystrophy with myositis) soleus muscles. Skeletal muscles from mdm mice have a small deletion in the N2A region of titin and show no increase in titin stiffness during active stretch. We found that: (1) force enhancement and depression were reduced in mdm soleus compared with wild-type muscles...
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J Exp Biol (2019) 222 (23): jeb200832.
Published: 29 November 2019
...Scott Medler ABSTRACT Skeletal muscle fibers are classified according to the myosin heavy chain (MHC) isoforms and other myofibrillar proteins expressed within these cells. In addition to ‘pure’ fibers expressing single MHC isoforms, many fibers are ‘hybrids’ that co-express two or more different...
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J Exp Biol (2019) 222 (20): jeb213348.
Published: 24 October 2019
... that terrestrial exercise improves locomotion in amphibious fishes out of water as a result of skeletal muscle remodeling. We compared the jumping performance of Kryptolebias marmoratus before and after an exercise training regimen, and assessed the muscle phenotype of control and exercise-trained fish. We found...
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J Exp Biol (2019) 222 (18): jeb204925.
Published: 23 September 2019
... relative telomere length (RTL) in DNA extracted from liver, heart, skeletal muscle (SM) and BAT of 45 juvenile and adult animals sampled either at mid- or late hibernation. Age did not have a significant effect on RTL in any tissue. At mid-hibernation, RTL of juvenile females was longer in BAT and SM than...
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J Exp Biol (2018) 221 (15): jeb180190.
Published: 1 August 2018
.... To study this issue, we examined gene expression profiles in select skeletal muscles that actuate woodpecker drum displays. This remarkable whole-body signal is produced when individuals rapidly hammer their bill against trees. We found that, compared with muscles that play no part in producing...
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J Exp Biol (2018) 221 (13): jeb173146.
Published: 4 July 2018
... of the insulin-like growth factor (IGF) system – an endocrine pathway downstream of growth hormone (GH). Skeletal muscle is the main target for growth and energetic storage in fish, yet little is known about how its growth is regulated during an immune response. We addressed this knowledge gap by characterising...
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J Exp Biol (2018) 221 (12): jeb177758.
Published: 22 June 2018
... activity during routine swimming. References Acevedo , L. M. and Rivero , J.-L. L. ( 2006 ). New insights into skeletal muscle fibre types in the dog with particular focus towards hybrid myosin phenotypes . Cell Tissue Res.   323 , 283 - 303 . 10.1007/s00441-005-0057-4 Agüera...
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