Myoelectric evidence of peripheral muscle fatigue during exercise in severe hypoxia: some references to m. vastus lateralis myosin heavy chain composition

1997 ◽  
Vol 75 (2) ◽  
pp. 151-159 ◽  
Author(s):  
A. D. Taylor ◽  
R. Bronks ◽  
P. Smith ◽  
B. Humphries
Keyword(s):  
Myosin Heavy Chain ◽  
Muscle Fatigue ◽  
Heavy Chain ◽  
Vastus Lateralis ◽  
Severe Hypoxia ◽  
Peripheral Muscle ◽  
Chain Composition ◽  
Myosin Heavy Chain Composition

scholarly journals Effect of pedaling rates and myosin heavy chain composition in the vastus lateralis muscle on the power generating capability during incremental cycling in humans

2008 ◽  
pp. 873-884
Author(s):  
J Majerczak ◽  
Z Szkutnik ◽  
K Duda ◽  
M Komorowska ◽  
L Kolodziejski ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Vastus Lateralis ◽  
Incremental Exercise ◽  
Vastus Lateralis Muscle ◽  
Lower Content ◽  
Lateralis Muscle ◽  
Chain Composition ◽  
Myosin Heavy Chain Composition

In this study, we have determined power output reached at maximal oxygen uptake during incremental cycling exercise (P(I, max)) performed at low and at high pedaling rates in nineteen untrained men with various myosin heavy chain composition (MyHC) in the vastus lateralis muscle. On separate days, subjects performed two incremental exercise tests until exhaustion at 60 rev min(-1) and at 120 rev min(-1). In the studied group of subjects P(I, max) reached during cycling at 60 rev min(-1) was significantly higher (p=0.0001) than that at 120 rev min(-1) (287+/-29 vs. 215+/-42 W, respectively for 60 and 120 rev min(-1)). For further comparisons, two groups of subjects (n=6, each) were selected according to MyHC composition in the vastus lateralis muscle: group H with higher MyHC II content (56.8+/-2.79 %) and group L with lower MyHC II content in this muscle (28.6+/-5.8 %). P(I, max) reached during cycling performed at 60 rev min(-1) in group H was significantly lower than in group L (p=0.03). However, during cycling at 120 rev min(-1), there was no significant difference in P(I, max) reached by both groups of subjects (p=0.38). Moreover, oxygen uptake (VO(2)), blood hydrogen ion [H(+)], plasma lactate [La(-)] and ammonia [NH(3)] concentrations determined at the four highest power outputs completed during the incremental cycling performed at 60 as well as 120 rev min(-1), in the group H were significantly higher than in group L. We have concluded that during an incremental exercise performed at low pedaling rates the subjects with lower content of MyHC II in the vastus lateralis muscle possess greater power generating capabilities than the subjects with higher content of MyHC II. Surprisingly, at high pedaling rate, power generating capabilities in the subjects with higher MyHC II content in the vastus lateralis muscle did not differ from those found in the subjects with lower content of MyHC II in this muscle, despite higher blood [H(+)], [La(-)] and [NH(3)] concentrations. This indicates that at high pedaling rates the subjects with higher percentage of MyHC II in the vastus lateralis muscle perform relatively better than the subjects with lower percentage of MyHC II in this muscle.

Effects of increased occlusal vertical dimension on daily activity and myosin heavy chain composition in rat jaw muscle

2009 ◽  
Vol 54 (8) ◽  
pp. 783-789 ◽  
Author(s):  
Yoshiki Ohnuki ◽  
Nobuhiko Kawai ◽  
Eiji Tanaka ◽  
Geerling E.J. Langenbach ◽  
Kazuo Tanne ◽  
...  
Keyword(s):  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Daily Activity ◽  
Vertical Dimension ◽  
Jaw Muscle ◽  
Chain Composition ◽  
Occlusal Vertical Dimension ◽  
Myosin Heavy Chain Composition

Effects of inactivity on myosin heavy chain composition and size of rat soleus fibers

1998 ◽  
Vol 21 (3) ◽  
pp. 375-389 ◽  
Author(s):  
Elena J. Grossman ◽  
Roland R. Roy ◽  
Robert J. Talmadge ◽  
Hui Zhong ◽  
V. Reggie Edgerton
Keyword(s):  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Chain Composition ◽  
Myosin Heavy Chain Composition

scholarly journals Myosin Heavy Chain Composition in Normal and Atrophic Equine Laryngeal Muscle

2006 ◽  
Vol 43 (6) ◽  
pp. 881-889 ◽  
Author(s):  
C. M. Adreani ◽  
Z. B. Li ◽  
M. Lehar ◽  
L. L. Southwood ◽  
P. L. Habecker ◽  
...  
Keyword(s):  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Laryngeal Muscle ◽  
Chain Composition ◽  
Myosin Heavy Chain Composition

Myosin Heavy Chain Composition is Related to Vertical Jump Performance

2015 ◽  
Vol 47 ◽  
pp. 102
Author(s):  
Michael T. Lane ◽  
Andrew C. Fry ◽  
Trent J. Herda ◽  
Joseph P. Weir ◽  
Ashley W. Herda
Keyword(s):  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Vertical Jump ◽  
Jump Performance ◽  
Chain Composition ◽  
Myosin Heavy Chain Composition

Myosin heavy chain composition of skeletal muscles in young rats growing under hypobaric hypoxia conditions

2000 ◽  
Vol 88 (2) ◽  
pp. 479-486 ◽  
Author(s):  
A. X. Bigard ◽  
H. Sanchez ◽  
O. Birot ◽  
B. Serrurier
Keyword(s):  
Myosin Heavy Chain ◽  
Heavy Chain ◽  
Wheel Running ◽  
Barometric Pressure ◽  
Major Influence ◽  
Type I ◽  
Running Activity ◽  
Equivalent Quantity ◽  
Chain Composition ◽  
Myosin Heavy Chain Composition

This study investigated the effects of voluntary wheel running on the myosin heavy chain (MHC) composition of the soleus (Sol) and plantaris muscles (Pla) in rats developing under hypobaric choronic hypoxia (CH) conditions during 4 wk in comparison with those of control rats maintained under local barometric pressure conditions (C) or rats pair-fed an equivalent quantity of food to that consumed by CH animals (PF). Compared with C animals, sedentary rats subjected to CH conditions showed a significant decrease in type I MHC in Sol (−12%, P < 0.01). Although strongly decreased under hypoxia, spontaneous running activity increased the expression of type I MHC ( P < 0.01) so that no difference in the MHC profile of Sol was shown between CH active and C active rats. The MHC distribution in Sol of PF rats was not significantly different from that found in C animals. CH resulted in a significant decrease in type I ( P < 0.01) and type IIA ( P < 0.005) MHC, concomitant with an increase in type IIB MHC in Pla ( P < 0.001), compared with C and PF animals. In contrast to results in Sol muscle, this slow-to-fast shift in the MHC profile was unaffected by spontaneous running activity. These results suggest that running exercise suppresses the hypoxia-induced slow-to-fast transition in the MHC expression in Sol muscles only. The hypoxia-induced decrease in food intake has no major influence on MHC expression in developing rats.

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