scholarly journals Age-related fatigue resistance in the knee extensor muscles is specific to contraction mode

2009 ◽  
Vol 39 (5) ◽  
pp. 692-702 ◽  
Author(s):  
Damien M. Callahan ◽  
Stephen A. Foulis ◽  
Jane A. Kent-Braun
Keyword(s):  
Fatigue Resistance ◽  
Knee Extensor ◽  
Age Related ◽  
Extensor Muscles ◽  
Knee Extensor Muscles

scholarly journals Fatigue resistance of the knee extensor muscles is not reduced in post-polio syndrome

2013 ◽  
Vol 23 (11) ◽  
pp. 892-898 ◽  
Author(s):  
Eric L. Voorn ◽  
Anita Beelen ◽  
Karin H.L. Gerrits ◽  
Frans Nollet ◽  
Arnold de Haan
Keyword(s):  
Fatigue Resistance ◽  
Knee Extensor ◽  
Extensor Muscles ◽  
Knee Extensor Muscles

Effects of age on human muscle torque, velocity, and power in two muscle groups

2003 ◽  
Vol 95 (6) ◽  
pp. 2361-2369 ◽  
Author(s):  
I. R. Lanza ◽  
T. F. Towse ◽  
G. E. Caldwell ◽  
D. M. Wigmore ◽  
J. A. Kent-Braun
Keyword(s):  
Dynamic Performance ◽  
Knee Extensor ◽  
Knee Extensors ◽  
Target Velocity ◽  
Downward Shift ◽  
Age Related ◽  
Extensor Muscles ◽  
Older Subjects ◽  
Muscle Groups ◽  
Knee Extensor Muscles

The purpose of this study was to test the hypotheses that, under isovelocity conditions, older compared with young humans would 1) be slower to reach target velocity and 2) exhibit a downward shift in the torque-velocity and power-velocity relationships in the ankle dorsiflexor and knee extensor muscles. We studied 12 young (26 ± 5 yr, 6 men/6 women) and 12 older (72 ± 6 yr, 6 men/6 women) healthy adults during maximal voluntary concentric contractions at preset target velocities (dorsiflexion: 0–240°/s; knee extension: 0–400°/s) using an isokinetic dynamometer. The time to target velocity was longer in older subjects in the dorsiflexors and knee extensors (both P ≤ 0.02). Averaged across all velocities, older subjects produced ∼26% less concentric torque and power in the dorsiflexors ( P < 0.01) and ∼32% less in the knee extensors ( P < 0.01). The downward shift in the torque-velocity relationship persisted even when torque was expressed relative to each subject's maximum. In the knee extensors only, the age-related decrement in power increased with increasing velocities, suggesting that this muscle group may be more susceptible to age-related losses of function than the dorsiflexor muscles are. In support of our hypotheses, these results demonstrate an age-related impairment in the dynamic performance of two functionally distinct muscle groups in healthy older adults. With age, the impairment of dynamic performance appears to exceed the loss of isometric performance, particularly in the 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

Intrinsic Properties of the Knee Extensor Muscles After Subacute Stroke

2010 ◽  
Vol 91 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Astrid M. Horstman ◽  
Karin H. Gerrits ◽  
Marijke J. Beltman ◽  
Peter A. Koppe ◽  
Thomas W. Janssen ◽  
...  
Keyword(s):  
Knee Extensor ◽  
Intrinsic Properties ◽  
Subacute Stroke ◽  
Extensor Muscles ◽  
Knee Extensor Muscles
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