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Keywords: Muscle
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Journal Articles
J Exp Biol (2021) 224 (1): jeb228973.
Published: 04 January 2021
... elevating tissue temperature to increase the rate of chemical processes. Yet, movement performance that is robust to changes in body temperature has been observed in numerous species. This thermally robust performance appears exceptional in light of the well-documented effects of temperature on muscle...
Journal Articles
J Exp Biol (2020) 223 (24): jeb236109.
Published: 21 December 2020
..., showed altered migratory behaviour (daily activity and Zugunruhe onset), and enhanced muscle growth and plasma testosterone levels, but showed no effect on testis growth. Temperature was perceived at both peripheral and central levels, and affected multiple molecular drivers culminating into the...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (17): jeb227736.
Published: 11 September 2020
... decades we have made progress in identifying that marine mammals require a period of postnatal maturation in order to attain mature diving physiology; this involves maturation of their blood and muscle oxygen stores, as well as an enhanced ability to reduce heart rate while diving, and the development of...
Journal Articles
J Exp Biol (2020) 223 (15): jeb218776.
Published: 13 August 2020
...Jackey Chen; Parastoo Mashouri; Stephanie Fontyn; Mikella Valvano; Shakeap Elliott-Mohamed; Alex M. Noonan; Stephen H. M. Brown; Geoffrey A. Power ABSTRACT The increase or decrease in isometric force following active muscle lengthening or shortening, relative to a reference isometric contraction at...
Journal Articles
J Exp Biol (2020) 223 (14): jeb218370.
Published: 27 July 2020
... from the limb flexors; however, skeletal muscle mass of sloths is reduced compared with other arboreal mammals. Although suspensory locomotion demands that muscles are active to counteract the pull of gravity, it is possible that sloths minimize muscle activation and/or selectively recruit slow motor...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (1): jeb199018.
Published: 06 January 2020
...Thomas Libby; Chidinma Chukwueke; Simon Sponberg ABSTRACT Muscle mediates movement but movement is typically unsteady and perturbed. Muscle is known to behave non-linearly and with history-dependent properties during steady locomotion, but the importance of history dependence in mediating muscle...
Journal Articles
J Exp Biol (2019) 222 (18): jeb180414.
Published: 12 September 2019
.... © 2019. Published by The Company of Biologists Ltd 2019 Summary: We propose that the term ‘yank’ should be used to denote the time derivative of force; this will help elucidate the function of multi-scale structures and processes throughout the sensorimotor system. Biomechanics Muscle...
Journal Articles
J Exp Biol (2019) 222 (5): jeb188805.
Published: 01 March 2019
... limbs is related to variation in locomotor performance. Although these studies have suggested direct relations between sprint speed and hindlimb morphology, few quantitative data exist. Consequently, it remains unclear whether selection acts in limb segment lengths, overall muscle mass or muscle...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (1): jeb187807.
Published: 04 January 2019
... form and function, as predicted from interspecific studies. Large differences in body mass of the queen caste of social bumblebees further allows testing of the predicted impact of size on flight metabolic properties, including the activity of some metabolic enzymes in flight muscle. Furthermore...
Journal Articles
J Exp Biol (2018) 221 (6): jeb171009.
Published: 23 March 2018
... butterflies to fly continuously in a respirometer (3 min duration), which typically caused episodes of exhaustion and recovery, suggesting a potential for cellular injury from hypoxia and reoxygenation in flight muscles. Indeed, flight muscle from butterflies flown on consecutive days had lipidome profiles...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (4): jeb166199.
Published: 22 February 2018
...Steven J. Newman; Bruce C. Jayne ABSTRACT A central issue for understanding locomotion of vertebrates is how muscle activity and movements of their segmented axial structures are coordinated, and snakes have a longitudinal uniformity of body segments and diverse locomotor behaviors that are well...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (22): 4225–4233.
Published: 15 November 2017
... transparency of the anemone shrimp Ancylomenes pedersoni . After as few as three tail flips, the previously transparent abdominal muscle became cloudy. Eliciting additional tail flips to the point of exhaustion (16±1 s.e.m.; n =23) resulted in complete opacity, though the original transparency returned after...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (6): 1154–1161.
Published: 15 March 2017
... predators on other constrictors remain unknown. To begin addressing these mechanisms, we studied the scaling of muscle cross-sectional area, pulling force and constriction pressure across the ontogeny of six species of snakes ( Lampropeltis californiae , L. getula , L. holbrooki , Pantherophis...
Journal Articles
J Exp Biol (2017) 220 (2): 167–170.
Published: 15 January 2017
... not a fundamental characteristic of muscle physiology, but a result of runners responding to speed constraints, i.e. runners selecting step frequencies that minimize metabolic cost per distance for a series of treadmill-specified speeds. Evaluating hopping metabolic rate over a narrow range of hop...
Journal Articles
J Exp Biol (2016) 219 (22): 3532–3543.
Published: 15 November 2016
... limiting factors of the manoeuvring performance of hummingbirds: (1) muscle mechanical power output and (2) delays in the neural sensing and control system. We focused on the magnificent hummingbird ( Eugenes fulgens , 7.8 g) and the black-chinned hummingbird ( Archilochus alexandri , 3.1 g), which...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (11): 1625–1631.
Published: 01 June 2016
... speed at which they move ( Hillman et al., 2014 ). Locomotor performance is determined by the relationship between muscle power output and the energetic cost to achieve that power output ( Curtin and Woledge, 1991 ; Lichtwark and Wilson, 2005 ; Woledge et al., 2009 ). In other words, locomotor...
Journal Articles
J Exp Biol (2016) 219 (2): 168–174.
Published: 01 January 2016
.... myosin V) or the strain-sensing myosins (e.g. myosin 1c). In contrast, most muscle myosins spend 80% of their ATPase cycle detached from actin. Within the myosin IIs found in human muscle, there are 11 different sarcomeric myosin isoforms, two smooth muscle isoforms as well as three non-muscle isoforms...
Journal Articles
J Exp Biol (2015) 218 (21): 3377–3380.
Published: 01 November 2015
...Alessandra Bosutti; Stuart Egginton; Yoann Barnouin; Bergita Ganse; Jörn Rittweger; Hans Degens ABSTRACT It is thought that the prime determinant of global muscle capillary density is the mean oxidative capacity. However, feedback control during maturational growth or adaptive remodelling of local...
Journal Articles
J Exp Biol (2015) 218 (19): 3010–3022.
Published: 01 October 2015
... investigate these factors, we measured electromyographic activity in eight hindlimb muscles of the guinea fowl ( Numida meleagris , N =6) during treadmill locomotion at two speeds (0.7 and 1.3 m s −1 ) and three terrain conditions at each speed: (i) level, (ii) repeated 5 cm low-contrast obstacles (<10...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (18): 2856–2863.
Published: 01 September 2015
...Nancy A. Curtin; Rebecca A. Diack; Timothy G. West; Alan M. Wilson; Roger C. Woledge ABSTRACT Skinned fibres have advantages for comparing the muscle properties of different animal species because they can be prepared from a needle biopsy taken under field conditions. However, it is not clear how...