Torque-velocity characteristics and muscle fiber type in human vastus lateralis

1985 ◽  
Vol 59 (2) ◽  
pp. 309-314 ◽  
Author(s):  
E. A. Froese ◽  
M. E. Houston
Keyword(s):  
Muscle Fiber ◽  
Fiber Type ◽  
Vastus Lateralis ◽  
Peak Torque ◽  
Muscle Fiber Type ◽  
Knee Extensors ◽  
Full Extension ◽  
Isokinetic Contractions ◽  
Torque Values ◽  
Fast Twitch

The relationship between torque-velocity characteristics of the knee extensors during isokinetic contractions and muscle fiber type of the vastus lateralis, determined from two muscle biopsy samples, was investigated in 12 male and 18 female subjects. Peak torque, corrected for the effect of gravity and impact artifact, was classified as corrected peak torque. The torque measured 30 degrees from full extension and, corrected for gravity, was classified as corrected torque at 30 degrees. No significant correlations were found between the percentage of fast-twitch fibers (%FT) or the relative area of FT fibers (%FTA) and corrected peak torque values for any of the velocities tested or the knee angles where corrected peak torques were measured. However, significant inverse relationships were determined for corrected torque at 30 degrees at all but the fastest velocity (270 degrees/s) and both %FT and %FTA for the male subjects. These results reveal that muscle fiber type of the vastus lateralis, based on duplicate muscle samples, is not related to the peak torque actually generated by the knee extensors but may influence the shape of the torque output for maximal contractions sustained over the entire range of motion.

Ferulic acid regulates muscle fiber type formation through the Sirt1/AMPK signaling pathway

2019 ◽  
Vol 10 (1) ◽  
pp. 259-265 ◽  
Author(s):  
Xiaoling Chen ◽  
Yafei Guo ◽  
Gang Jia ◽  
Hua Zhao ◽  
Guangmang Liu ◽  
...  
Keyword(s):  
Ferulic Acid ◽  
Signaling Pathway ◽  
Muscle Fiber ◽  
Fiber Type ◽  
Muscle Fiber Type ◽  
Ampk Signaling ◽  
Slow Twitch ◽  
Fast Twitch

Ferulic acid promotes slow-twitch and inhibits fast-twitch myofiber formation via Sirt1/AMPK.

Muscle fiber type distribution and architecture of the cat diaphragm

1983 ◽  
Vol 55 (5) ◽  
pp. 1386-1392 ◽  
Author(s):  
G. C. Sieck ◽  
R. R. Roy ◽  
P. Powell ◽  
C. Blanco ◽  
V. R. Edgerton ◽  
...  
Keyword(s):  
Muscle Fiber ◽  
Fiber Type ◽  
Muscle Fibers ◽  
Muscle Fiber Type ◽  
Diaphragmatic Muscle ◽  
Band Area ◽  
Type Composition ◽  
Abdominal Surface ◽  
Fiber Type Distribution ◽  
Fast Twitch

Three types of diaphragmatic muscle fibers were identified histochemically in the sternal, costal, and crural regions of the cat diaphragm. Differences in the proportion of each muscle fiber type were observed between the abdominal and thoracic surfaces of the diaphragm but not among the different regions. A higher percentage of slow-twitch oxidative fibers was noted on the abdominal surface, whereas more fast-twitch fibers (fast-twitch oxidative-glycolytic and fast-twitch glycolytic) were found on the thoracic surface. Differences in muscle architecture were observed between diaphragmatic regions, but not between abdominal and thoracic sides. Overall, muscle fibers were longer in the crural regions, with the longest fibers being found in the crossing-band area of the crura. In the costal regions, fibers were longest in the center and became shorter toward the ventral and dorsal extent of these regions. Fiber lengths were similar throughout the sternal region. In each diaphragmatic region, the length of fibers extended from the origin of the muscle to its insertion. We conclude that functional differences between diaphragmatic regions could be attributed to fiber length and/or orientation, but not to differences in fiber-type composition.

scholarly journals Great power comes at a high (locomotor) cost: the role of muscle fascicle length in the power versus economy performance trade-off

2021 ◽  
Author(s):  
Amanda N. Cooper ◽  
William J. McDermott ◽  
James C. Martin ◽  
Shea O. Dulaney ◽  
David R. Carrier
Keyword(s):  
Muscle Fiber ◽  
Fiber Type ◽  
Vastus Lateralis ◽  
Power Production ◽  
Muscle Fiber Type ◽  
Maximal Power ◽  
Fascicle Length ◽  
Cost Of Transport ◽  
Trade Off ◽  
Muscle Fascicle

Muscle design constraints preclude simultaneous specialization of the vertebrate locomotor system for explosive and economical force generation. The resulting performance trade-off between power and economy has been attributed primarily to individual differences in muscle fiber type composition. While certainly crucial for performance specialization, fiber type likely interacts with muscle architectural parameters, such as fascicle length, to produce this trade-off. Longer fascicles composed of more serial sarcomeres can achieve faster shortening velocities, allowing for greater power production. Long fascicles likely reduce economy, however, because more energy-consuming contractile units are activated for a given force production. We hypothesized that longer fascicles are associated with both increased power production and locomotor cost. In a set of 11 power- and 13 endurance-trained recreational athletes, we measured 1) muscle fascicle length via ultrasound in gastrocnemius lateralis, gastrocnemius medialis, and vastus lateralis, 2) maximal power during cycling and countermovement jumps, and 3) running cost of transport. We estimated muscle fiber type noninvasively based on the pedaling rate at which maximal cycling power occurred. As predicted, longer gastrocnemius muscle fascicles were correlated with greater lower-body power production and cost of transport. Multiple regression analyses revealed that variability in maximal power was explained by fiber type (48% for cycling; 25% for jumping) and average fascicle length (18% for cycling; 12% for jumping), while average fascicle length accounted for 15% of the variation in cost of transport. These results suggest that, at least for certain muscles, fascicle length plays an important role in the power versus economy performance trade-off.

scholarly journals Muscle-Fiber Type and Blood Oxidative Stress After Eccentric Exercise

2011 ◽  
Vol 21 (6) ◽  
pp. 462-470 ◽  
Author(s):  
John Quindry ◽  
Lindsey Miller ◽  
Graham McGinnis ◽  
Megan Irwin ◽  
Charles Dumke ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Muscle Fiber ◽  
Fiber Type ◽  
Muscle Fiber Type ◽  
Vastus Lateralis Muscle ◽  
Type I ◽  
Oxidative Stress Biomarkers ◽  
Stress Biomarkers ◽  
Fast Twitch Muscle ◽  
Fast Twitch

Acute strength exercise elicits a transient oxidative stress, but the factors underlying the magnitude of this response remain unknown. The purpose of this investigation was to determine whether muscle-fiber type relates to the magnitude of blood oxidative stress after eccentric muscle activity. Eleven college-age men performed 3 sets of 50 eccentric knee-extensions. Blood samples taken pre-, post-, and 24, 48, 72, and 96 hr postexercise were assayed for comparison of muscle damage and oxidative-stress biomarkers including protein carbonyls (PCs). Vastus lateralis muscle biopsies were assayed for relative percentage of slow- and fast-twitch muscle fibers. There was a mixed fiber composition (Type I = 39.6% ± 4.5%, Type IIa = 35.7% ± 3.5%, Type IIx = 24.8% ± 3.8%; p = .366). PCs were elevated 24, 48, and 72 hr (p = .032) postexercise, with a peak response of 126% (p = .012) above baseline, whereas other oxidative-stress biomarkers were unchanged. There are correlations between Type II muscle-fiber type and postexercise PC. Further study is needed to understand the mechanisms responsible for the observed fast-twitch muscle-fiber oxidative-stress relationship.

Torque-velocity relationships and muscle fiber composition in elite female athletes

1979 ◽  
Vol 47 (2) ◽  
pp. 388-392 ◽  
Author(s):  
R. J. Gregor ◽  
V. R. Edgerton ◽  
J. J. Perrine ◽  
D. S. Campion ◽  
C. DeBus
Keyword(s):  
Muscle Fiber ◽  
Female Athletes ◽  
Fiber Type ◽  
Vastus Lateralis ◽  
Fiber Types ◽  
Full Extension ◽  
Slow Twitch ◽  
Extensor Torque ◽  
Slow Twitch Fibers

The relationship between the predominance of fast and slow muscle fibers of the vastus lateralis and “in vivo” torque velocity properties in 22 female athletes was studied. Fiber types were classified according to the histochemical myofibrillar adenosine triphosphatase technique at a basic pH. Maximal extensor troques were recorded at 30 degrees from full extension at four selected velocities. While results confirm earlier reports on muscle fiber type and performance, an additional finding was that as knee extension velocities increased from 0 to 95 degrees/s angle specific extensor torque production did not decline as seen in in vitro muscle preparations. The difference in extensor torque between 0 and 96 degrees/s appeared far more critical than the differences observed between 96 and 288 degrees/s. Significant differences in torque were seen at 96, 192, and 288 degrees/s in thos with greater than 50% and less than 50% slow-twitch fibers. When expressed per kilogram of body weight the subjects with greater than 50% fast-twitch fiber produced the greatest torque at 192 degrees/s. These results suggest that the velocity at which torque begins to decline in vivo is related to the proportion of slow-twitch fibers in the vastus lateralismuscle.

Relation of Porcine Muscle Fiber Type and Size to Postmortem Shortening

1971 ◽  
Vol 32 (1) ◽  
pp. 57-61 ◽  
Author(s):  
H. B. Hendricks ◽  
D. T. Lafferty ◽  
E. D. Aberle ◽  
M. D. Judge ◽  
J. C. Forrest
Keyword(s):  
Muscle Fiber ◽  
Fiber Type ◽  
Muscle Fiber Type ◽  
Porcine Muscle
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