Activation of fast-twitch fibers assessed with twitch potentiation

2012 ◽  
Vol 46 (2) ◽  
pp. 218-227 ◽  
Author(s):  
Kazushige Sasaki ◽  
Yukie Tomioka ◽  
Naokata Ishii
Keyword(s):  
Twitch Potentiation ◽  
Fast Twitch

scholarly journals Evidence for membrane microheterogeneity in the sarcoplasmic reticulum of fast twitch skeletal muscle.

1982 ◽  
Vol 257 (19) ◽  
pp. 11689-11695
Author(s):  
W B Van Winkle ◽  
R J Bick ◽  
D E Tucker ◽  
C A Tate ◽  
M L Entman
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Fast Twitch ◽  
Membrane Microheterogeneity

The effect of gadolinium DTPA on tissue water compartments in slow- and fast-twitch rabbit muscles

1989 ◽  
Vol 11 (2) ◽  
pp. 172-181 ◽  
Author(s):  
I. Kofi Adzamli ◽  
Ferenc A. Jolesz ◽  
Alan R. Bleier ◽  
Robert V. Mulkern ◽  
Tamas Sandor
Keyword(s):  
Tissue Water ◽  
Gadolinium Dtpa ◽  
Water Compartments ◽  
Fast Twitch

scholarly journals Adrenergic control of vascular resistance varies in muscles composed of different fiber types: influence of the vascular endothelium

2011 ◽  
Vol 301 (3) ◽  
pp. R783-R790 ◽  
Author(s):  
Bradley J. Behnke ◽  
Robert B. Armstrong ◽  
Michael D. Delp
Keyword(s):  
Blood Flow ◽  
Vascular Resistance ◽  
Vascular Endothelium ◽  
Fold Increase ◽  
Male Rats ◽  
Type I ◽  
Fiber Types ◽  
Fast Twitch Muscle ◽  
Dose Responses ◽  
Fast Twitch

The influence of the sympathetic nervous system (SNS) upon vascular resistance is more profound in muscles comprised predominately of low-oxidative type IIB vs. high-oxidative type I fiber types. However, within muscles containing high-oxidative type IIA and IIX fibers, the role of the SNS on vasomotor tone is not well established. The purpose of this study was to examine the influence of sympathetic neural vasoconstrictor tone in muscles composed of different fiber types. In adult male rats, blood flow to the red and white portions of the gastrocnemius (GastRed and GastWhite, respectively) and the soleus muscle was measured pre- and postdenervation. Resistance arterioles from these muscles were removed, and dose responses to α1-phenylephrine or α2-clonidine adrenoreceptor agonists were determined with and without the vascular endothelium. Denervation resulted in a 2.7-fold increase in blood flow to the soleus and GastRed and an 8.7-fold increase in flow to the GastWhite. In isolated arterioles, α2-mediated vasoconstriction was greatest in GastWhite (∼50%) and less in GastRed (∼31%) and soleus (∼17%); differences among arterioles were abolished with the removal of the endothelium. There was greater sensitivity to α1-mediated vasoconstriction in the GastWhite and GastRed vs. the soleus, which was independent of whether the endothelium was present. These data indicate that 1) control of vascular resistance by the SNS in high-oxidative, fast-twitch muscle is intermediate to that of low-oxidative, fast-twitch and high-oxidative, slow-twitch muscles; and 2) the ability of the SNS to control blood flow to low-oxidative type IIB muscle appears to be mediated through postsynaptic α1- and α2-adrenoreceptors on the vascular smooth muscle.

scholarly journals High-speed jaw-opening exercise in training suprahyoid fast-twitch muscle fibers

2018 ◽  
Vol Volume 13 ◽  
pp. 125-131 ◽  
Author(s):  
Mariko Matsubara ◽  
Haruka Tohara ◽  
Koji Hara ◽  
Hiromichi Shinozaki ◽  
Yasuhiro Yamazaki ◽  
...  
Keyword(s):  
High Speed ◽  
Muscle Fibers ◽  
Jaw Opening ◽  
Fast Twitch Muscle ◽  
Fast Twitch

Effect of endurance training on glucose transport capacity and glucose transporter expression in rat skeletal muscle

1990 ◽  
Vol 259 (6) ◽  
pp. E778-E786 ◽  
Author(s):  
T. Ploug ◽  
B. M. Stallknecht ◽  
O. Pedersen ◽  
B. B. Kahn ◽  
T. Ohkuwa ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Glucose Transport ◽  
Glucose Transporter ◽  
Training Session ◽  
Residual Effect ◽  
Exercise Session ◽  
Transport Capacity ◽  
Glut 1 ◽  
Glut 4 ◽  
Fast Twitch

The effect of 10 wk endurance swim training on 3-O-methylglucose (3-MG) uptake (at 40 mM 3-MG) in skeletal muscle was studied in the perfused rat hindquarter. Training resulted in an increase of approximately 33% for maximum insulin-stimulated 3-MG transport in fast-twitch red fibers and an increase of approximately 33% for contraction-stimulated transport in slow-twitch red fibers compared with nonexercised sedentary muscle. A fully additive effect of insulin and contractions was observed both in trained and untrained muscle. Compared with transport in control rats subjected to an almost exhaustive single exercise session the day before experiment both maximum insulin- and contraction-stimulated transport rates were increased in all muscle types in trained rats. Accordingly, the increased glucose transport capacity in trained muscle was not due to a residual effect of the last training session. Half-times for reversal of contraction-induced glucose transport were similar in trained and untrained muscles. The concentrations of mRNA for GLUT-1 (the erythrocyte-brain-Hep G2 glucose transporter) and GLUT-4 (the adipocyte-muscle glucose transporter) were increased approximately twofold by training in fast-twitch red muscle fibers. In parallel to this, Western blot demonstrated a approximately 47% increase in GLUT-1 protein and a approximately 31% increase in GLUT-4 protein. This indicates that the increases in maximum velocity for 3-MG transport in trained muscle is due to an increased number of glucose transporters.

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