Twitch potentiation induced by stimulated and voluntary isometric contractions at various torque levels in human knee extensor muscles

2011 ◽  
Vol 43 (3) ◽  
pp. 360-366 ◽  
Author(s):  
Naokazu Miyamoto ◽  
Toshimasa Yanai ◽  
Yasuo Kawakami
Keyword(s):  
Knee Extensor ◽  
Isometric Contractions ◽  
Human Knee ◽  
Twitch Potentiation ◽  
Extensor Muscles ◽  
Knee Extensor Muscles

Twitch potentiation after voluntary versus electrically induced isometric contractions in human knee extensor muscles

2008 ◽  
Vol 104 (3) ◽  
pp. 463-472 ◽  
Author(s):  
Bernardo Requena ◽  
Helena Gapeyeva ◽  
Inmaculada García ◽  
Jaan Ereline ◽  
Mati Pääsuke
Keyword(s):  
Knee Extensor ◽  
Isometric Contractions ◽  
Human Knee ◽  
Twitch Potentiation ◽  
Extensor Muscles ◽  
Knee Extensor Muscles

Effects of chronic low-frequency electrical stimulation of human knee extensor muscles exposed to static passive stretching

2006 ◽  
Vol 32 (1) ◽  
pp. 74-80 ◽  
Author(s):  
B. S. Shenkman ◽  
E. V. Lyubaeva ◽  
D. V. Popov ◽  
A. I. Netreba ◽  
O. S. Tarasova ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Low Frequency ◽  
Knee Extensor ◽  
Human Knee ◽  
Passive Stretching ◽  
Extensor Muscles ◽  
Knee Extensor Muscles ◽  
Stimulation Of

Knee angle-dependent oxygen consumption during isometric contractions of the knee extensors determined with near-infrared spectroscopy

2005 ◽  
Vol 99 (2) ◽  
pp. 579-586 ◽  
Author(s):  
C. J. de Ruiter ◽  
M. D. de Boer ◽  
M. Spanjaard ◽  
A. de Haan
Keyword(s):  
Oxygen Consumption ◽  
Near Infrared ◽  
Vastus Lateralis ◽  
Knee Extensor ◽  
Rectus Femoris ◽  
Knee Extensors ◽  
Isometric Contractions ◽  
Knee Angle ◽  
Extensor Muscles ◽  
Knee Extensor Muscles

Fatigue resistance of knee extensor muscles is higher during voluntary isometric contractions at short compared with longer muscle lengths. In the present study we hypothesized that this would be due to lower energy consumption at short muscle lengths. Ten healthy male subjects performed isometric contractions with the knee extensor muscles at a 30, 60, and 90° knee angle (full extension = 0°). At each angle, muscle oxygen consumption (mV̇o2) of the rectus femoris, vastus lateralis, and vastus medialis muscle was obtained with near-infrared spectroscopy. mV̇o2 was measured during maximal isometric contractions and during contractions at 10, 30, and 50% of maximal torque capacity. During all contractions, blood flow to the muscle was occluded with a pressure cuff (450 mmHg). mV̇o2 significantly ( P < 0.05) increased with torque and at all torque levels, and for each of the three muscles mV̇o2 was significantly lower at 30° compared with 60° and 90° and mV̇o2 was similar ( P > 0.05) at 60° and 90°. Across all torque levels, average (± SD) mV̇o2 at the 30° angle for vastus medialis, rectus femoris, and vastus lateralis, respectively, was 70.0 ± 10.4, 72.2 ± 12.7, and 75.9 ± 8.0% of the average mV̇o2 obtained for each torque at 60 and 90°. In conclusion, oxygen consumption of the knee extensors was significantly lower during isometric contractions at the 30° than at the 60° and 90° knee angle, which probably contributes to the previously reported longer duration of sustained isometric contractions at relatively short muscle lengths.

Intersession reliability of the interpolated twitch technique applied during isometric, concentric, and eccentric actions of the human knee extensor muscles

2017 ◽  
Vol 56 (2) ◽  
pp. 324-327 ◽  
Author(s):  
Martin Behrens ◽  
Florian Husmann ◽  
Martin Gube ◽  
Sabine Felser ◽  
Matthias Weippert ◽  
...  
Keyword(s):  
Knee Extensor ◽  
Human Knee ◽  
Interpolated Twitch Technique ◽  
Extensor Muscles ◽  
Eccentric Actions ◽  
Knee Extensor Muscles

Interaction of fibre type, potentiation and fatigue in human knee extensor muscles

2003 ◽  
Vol 178 (2) ◽  
pp. 165-173 ◽  
Author(s):  
T. Hamada ◽  
D. G. Sale ◽  
J. D. MacDougall ◽  
M. A. Tarnopolsky
Keyword(s):  
Fibre Type ◽  
Knee Extensor ◽  
Human Knee ◽  
Extensor Muscles ◽  
Knee Extensor Muscles

Older adults are less steady during submaximal isometric contractions with the knee extensor muscles

2002 ◽  
Vol 92 (3) ◽  
pp. 1004-1012 ◽  
Author(s):  
Brian L. Tracy ◽  
Roger M. Enoka
Keyword(s):  
Maximum Voluntary Contraction ◽  
Knee Extensor ◽  
Voluntary Contraction ◽  
Eccentric Contractions ◽  
Isometric Contractions ◽  
Antagonist Muscle ◽  
Old Adults ◽  
Extensor Muscles ◽  
Young Subjects ◽  
Knee Extensor Muscles

This study compared the steadiness of submaximal contractions with the knee extensor muscles in young and old adults. Twenty young and twenty old subjects underwent assessment of isometric maximum voluntary contraction (MVC), one-repetition maximum (1-RM) strength, and steadiness during isometric, concentric, and eccentric contractions with the knee extensor muscles. The old adults displayed 33% lower MVC force and a 41% lower 1-RM load. The coefficient of variation for force was significantly greater for the old adults during isometric contractions at 2, 5, and 10% of MVC but not at 50% MVC. The decline in steadiness at low forces experienced by the men was marginally greater than that experienced by the women. The steadiness of concentric and eccentric contractions was similar in young and old adults at 5, 10, and 50% of 1-RM load. Old subjects exhibited greater coactivation of an antagonist muscle compared with young subjects during the submaximal isometric and anisometric contractions. These results indicate that, whereas the ability to exert steady submaximal forces with the knee extensor muscles was reduced in old adults, fluctuations in knee joint angle during slow movements were similar for young and old adults.

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