Results 101 to 110 of about 2,580,489 (207)

Small muscle mass aerobic exercise in health and disease: Unique insights into muscle vascular and metabolic control and performance

Experimental Physiology, EarlyView.
Abstract Studies of small muscle mass exercise (SMME) have revealed that the peripheral O2 transport–utilization cascade is a dynamically regulated system in which perfusive and diffusive components can be selectively amplified, redistributed and mechanically limited depending on contraction pattern, recruitment strategy and intramuscular pressure ...
Shunsaku Koga, David C. Poole, Thomas J. Barstow, Dai Okushima, Richie P. Goulding   +4 more
wiley   +1 more source

Zebrafish fast muscle contractions avoid the mammalian requirement for voltage-gated Na+ channels.

PLoS Biology
Fast skeletal muscle fibers from zebrafish share a number of functional properties with mammalian twitch muscle fibers, making this vertebrate a precious model to investigate the pathophysiology of neuromuscular disorders.
Léa Demesmay, Romane Idoux, Christine Berthier, Claire Bernat, Léon Espinosa, Vincent Jacquemond, Frédéric Brunet, Angel Maunier-Mercier, Philippe Lory, Sophie Nicole, Bruno Allard   +10 more
doaj   +1 more source

Intermittent low‐intensity contractions cause a dissociation between maximal motor unit firing rates and changes in torque and contractile speed

Experimental Physiology, EarlyView.
Abstract The purpose was to test: (1) whether the decline in maximal motor unit (MU) firing rate is an invariable response when maximal voluntary contraction (MVC) torque is reduced following a submaximal muscle fatiguing task; and (2) whether fatigue‐induced slowing of contractile speed and firing rate decline are co‐dependent. Ten participants (three
Alexander M. Zero, Raaj A. Dudani, Jacob Fanous, Charles L. Rice   +3 more
wiley   +1 more source

Differential response of skeletal muscles to mTORC1 signaling during atrophy and hypertrophy [PDF]

, 2013
BACKGROUND: Skeletal muscle mass is determined by the balance between protein synthesis and degradation. Mammalian target of rapamycin complex 1 (mTORC1) is a master regulator of protein translation and has been implicated in the control of muscle mass ...
Handschin, Christoph, Bentzinger, C. Florian, Guridi, Maitea, Castets, Perrine, Hall, Michael N, Tintignac, Lionel A., Hall, Michael N., Perrine Castets, Romanino, Klaas, Tintignac, Lionel, Rüegg, Markus A, Michael N Hall, Lin, Shuo, Markus A Rüegg, Bentzinger, C Florian, Christoph Handschin, Serge Summermatter, Summermatter, Serge, C Bentzinger, Klaas Romanino, Maitea Guridi, Shuo Lin, Rüegg, Markus A., Lionel A Tintignac   +23 more
core   +1 more source

Systemic pirfenidone treatment fails to mitigate fibrosis and compromises functional recovery in a porcine model of volumetric muscle loss

Experimental Physiology, EarlyView.
Abstract Repurposing clinically approved antifibrotic agents presents a potential near‐term therapeutic strategy to mitigate the extensive fibrotic scarring that follows severe volumetric muscle loss (VML) injury and inhibits functional recovery. We hypothesized that daily oral administration of pirfenidone, an FDA‐approved antifibrotic, would mitigate
Jessica M. Motherwell, Ondine Eken, Claudia E. Hernandez, Christopher L. Dearth, Stephen M. Goldman   +4 more
wiley   +1 more source

Nuclear receptors and skeletal muscle fiber type

Journal of Physical Fitness and Sports Medicine, 2015
The contractile and metabolic properties of skeletal muscle depend on muscle fiber type composition. There are two major fiber types: type 1 fibers (slow-twitch oxidative) and type 2 fibers (fast-twitch glycolytic).
Wataru Mizunoya
doaj   +1 more source

Putting the brakes on muscle growth: Myostatin as regulator of disuse atrophy

Experimental Physiology, EarlyView.
Abstract Skeletal muscle is a highly plastic tissue that rapidly adapts to changes in mechanical loading and metabolic activity. Periods of inactivity, including bed rest, limb immobilization or microgravity, induce a pronounced loss of muscle mass and function.
Derk H. C. Nieuwenhuijsen, Moritz Eggelbusch, Rob C. I. Wüst   +2 more
wiley   +1 more source

Slow motor neuron stimulation of locust skeletal muscle: model and measurement

, 2013
The isometric force response of the locust hind leg extensor tibia muscle to stimulation of a slow extensor tibia motor neuron is experimentally investigated, and a mathematical model describing the response presented.
Mace, Brian R., Rustighi, Emiliano, Wilson, Emma, Mace, Brian R, Newland, Philip L, Newland, Philip L., Wilson, Emma Denise   +6 more
core   +1 more source

Elevation of body temperature during exercise enhances protection against dexamethasone‑induced skeletal muscle atrophy

Experimental Physiology, EarlyView.
Abstract Prolonged glucocorticoid exposure induces skeletal muscle atrophy through suppression of protein synthesis and activation of catabolic signalling pathways. Although exercise attenuates glucocorticoid‐induced muscle loss, whether exercise‐induced increases in body temperature contribute remains unclear.
Berkay Ozerklig, Senay Akin, Seda Olgaz Bingol, Bulent Okan Yildiz, Scott K. Powers, Ibrahim Turkel, Haydar A. Demirel   +6 more
wiley   +1 more source

Imaging caffeine-induced Ca²⁺transients in individual fast-twitch and slow-twitch rat skeletal muscle fibers

, 1998
Fast-twitch and slow-twitch rat skeletal muscles produce dissimilar contractures with caffeine. We used digital imaging microscopy to monitor Ca2+ (with fluo 3-acetoxymethyl ester) and sarcomere motion in intact, unrestrained rat muscle fibers to study ...
Stuart R. Taylor, Murali K. D. Pagala
core   +1 more source