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Keywords: Work loop
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Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol jeb.248177.
Published: 24 October 2024
...Caitlin Bemis; Nicolai Konow; Monica Daley; Kiisa Nishikawa Traditional work loop studies, that use sinusoidal length trajectories with constant frequencies, lack the complexities of in vivo muscle mechanics observed in modern studies. This study refines methodology of the “avatar” method...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol jeb.248051.
Published: 4 October 2024
...Roger W. P. Kissane; Graham N. Askew The work loop technique was developed to assess muscle performance during cyclical length changes with phasic activation, simulating the in vivo conditions of many muscles, particularly during locomotion. To estimate muscle function in vivo , the standard...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2024) 227 (18): jeb249238.
Published: 19 September 2024
... work. Through a combination of X-ray reconstruction of moving morphology (XROMM), electromyography and fluoromicrometry, we characterised the 3D kinematics of the jaw and digastric muscle during feeding in rabbits. Subsequently, the work loop technique was used to simulate in vivo muscle behaviour...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2024) 227 (15): jeb246879.
Published: 1 August 2024
... not operate at optimal lengths during force development in vivo , but muscle fascicle velocities are consistent with optimizing power during work production, and economy of force at higher loads. Muscle function Muscle physiology Work loop Work loops Muscle properties KU Leuven http...
Includes: Supplementary data
Journal Articles
In collection:
Comparative biomechanics of movement
Journal:
Journal of Experimental Biology
J Exp Biol (2023) 226 (13): jeb244721.
Published: 13 July 2023
...Nicole Rice; Caitlin M. Bemis; Monica A. Daley; Kiisa Nishikawa ABSTRACT The work loop technique has provided key insights into in vivo muscle work and power during steady locomotion. However, for many animals and muscles, ex vivo experiments are not feasible. In addition, purely sinusoidal strain...
Journal Articles
In collection:
Comparative biomechanics of movement
Journal:
Journal of Experimental Biology
J Exp Biol (2022) 225 (9): jeb243285.
Published: 11 May 2022
...Sharn P. Shelley; Rob S. James; Steven J. Eustace; Emma Eyre; Jason Tallis ABSTRACT This study examined the effect of stimulation frequency (140, 200, 230 and 260 Hz) on isometric force, work loop (WL) power and the fatigue resistance of extensor digitorum longus (EDL) muscle ( n =32), isolated...
Includes: Supplementary data
Journal Articles
In collection:
Comparative biomechanics of movement
Journal:
Journal of Experimental Biology
J Exp Biol (2022) 225 (9): jeb244178.
Published: 9 May 2022
... muscle. Four-week-old female CD-1 mice were randomly selected to consume either a standard laboratory diet or a standard laboratory diet in conjunction with a HFD for 20 weeks. Peripheral soleus and core diaphragm were isolated from each animal and maximal isometric force and work loop power were...
Journal Articles
In collection:
Comparative biomechanics of movement
Journal:
Journal of Experimental Biology
J Exp Biol (2020) 223 (21): jeb225839.
Published: 12 November 2020
... amplitude over frequency may instead derive from limitations of muscle physiology at high frequency. We tested this hypothesis by developing a novel in situ work loop approach to measure muscle force and power output from the whole pectoralis major of zebra finches. This method allowed for multiple...
Includes: Supplementary data
Journal Articles
In collection:
Comparative biomechanics of movement
Journal:
Journal of Experimental Biology
J Exp Biol (2020) 223 (1): jeb199018.
Published: 6 January 2020
... strain perturbations is history dependent, but is captured by a viscoelastic model with memory; the data and model show that the muscle perturbation response depends on locomotor frequency. Muscle Work loop Force Running Cockroach Viscoelastic Muscle produces, dissipates, stores...
Journal Articles
In collection:
Comparative biomechanics of movement
Journal:
Journal of Experimental Biology
J Exp Biol (2019) 222 (7): jeb195578.
Published: 5 April 2019
... of the humerotriceps, we developed an in situ work loop approach to measure how activation duration and contractile cycle frequency affected muscle work and power across the full range of activation onset times. The humerotriceps produced predominantly net negative power, likely due to relatively long stimulus...
Includes: Supplementary data
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2018) 221 (21): jeb190132.
Published: 5 November 2018
... served as controls or underwent 8 weeks of voluntary wheel running. Following the treatment intervention, whole soleus (SOL) or a section of the costal diaphragm (DIA) was isolated from each mouse and tested to determine the effect of 70 µmol l −1 caffeine on work loop power output. Although caffeine...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2016) 219 (2): 183–188.
Published: 1 January 2016
... in vivo . Robert Josephson incorporated lengthening contractions into a work loop analysis that shifted the focus to dynamic muscle function, varying force, length and work done both by and on muscle during a single muscle work cycle. It became apparent that muscle is both a force generator and a spring...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2015) 218 (22): 3589–3595.
Published: 1 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
Journal:
Journal of Experimental Biology
J Exp Biol (2015) 218 (19): 3150–3159.
Published: 1 October 2015
... elements (CEs) within a compliant muscle–tendon unit (MTU), we used a novel work loop approach that included implanted sonomicrometry crystals along muscle fascicles. This enabled us to decouple CE and SEE length trajectories when cyclic strain patterns were applied to an isolated plantaris MTU from...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2013) 216 (14): 2587–2594.
Published: 15 July 2013
... lasting more than a week, during which the animals are largely immobile. Previous hibernation studies have demonstrated that such natural models of skeletal muscle disuse cause limited or no change in either skeletal muscle size or contractile performance. However, work loop analysis of skeletal muscle...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2012) 215 (3): 552–558.
Published: 1 February 2012
... of temperature on sustained skeletal muscle performance. The iliotibialis muscle was isolated from eight male Xenopus tropicalis individuals and subjected to in vitro isometric and work-loop studies at test temperatures of 15, 24, 30 and 32°C. Work-loop power output (average power per cycle) was maximised...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2012) 215 (2): 324–330.
Published: 15 January 2012
... (C,D) and heat (E,F) traces and work loops (G,H) for mouse soleus muscles subjected to Saw25% (A,C,E,G) and Saw50% (B,D,F,H) cycles at 5 Hz. The dashed lines highlight the end of shortening. Fig. 4. Example strain (A,B), stress (C,D) and heat (E,F) traces and work loops (G,H) for mouse soleus...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2008) 211 (10): 1603–1611.
Published: 15 May 2008
... and power production were measured in isolated bundles of red fibres from 0.5 L by the work loop technique. Power was maximal at 3–4 Hz and fell to less than 50% of maximum after 6 Hz. Based on the timing of activation, muscle strain, tail beat frequencies and forces in the caudal tendon while swimming, we...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2008) 211 (6): 873–882.
Published: 15 March 2008
... resting length. We subjected in vitro VIL preparations to strain cycling and stimulus phase and duration similar to that of natural crawling. The resulting work loops were figure-eight shaped, with the muscle performing work during the shortest 45–65% of the strain cycle but dissipating work during...
Journal Articles
Journal:
Journal of Experimental Biology
J Exp Biol (2008) 211 (2): 180–186.
Published: 15 January 2008
... and activation. A simulated work loop method was used to understand prior observations of sub-maximal power output in the dominant flight musculature of the hawkmoth Manduca sexta L. Here we show that mechanical work output and energy consumption ( via ATP) vary with the phase of activation, although they do so...
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