scholarly journals In vivo Measurement of Knee Extensor Muscle Function in Mice

10.3791/62211 ◽  
2021 ◽  
Author(s):  
Camille R. Brightwell ◽  
Ted G. Graber ◽  
Benjamin D. Brightwell ◽  
Matthew Borkowski ◽  
Brian Noehren ◽  
...  
Keyword(s):  
Muscle Function ◽  
Knee Extensor ◽  
Extensor Muscle ◽  
In Vivo Measurement

The relationship of testosterone and AR CAG repeat genotype with knee extensor muscle function of young and older men

2012 ◽  
Vol 47 (6) ◽  
pp. 437-443 ◽  
Author(s):  
J.P. Folland ◽  
T.M. Mc Cauley ◽  
C. Phypers ◽  
B. Hanson ◽  
S.S. Mastana
Keyword(s):  
Muscle Function ◽  
Knee Extensor ◽  
Older Men ◽  
Extensor Muscle ◽  
Cag Repeat ◽  
Relationship Of ◽  
The Relationship

scholarly journals Effects Of Old Age And Contraction Mode On Knee Extensor Muscle Metabolic Economy In Vivo

2020 ◽  
Vol 52 (7S) ◽  
pp. 346-346
Author(s):  
Liam F. Fitzgerald ◽  
Miles F. Bartlett ◽  
R. Anthony Martin ◽  
Ericber Jimenez Francisco ◽  
Frank C. Sup ◽  
...  
Keyword(s):  
Old Age ◽  
Knee Extensor ◽  
Extensor Muscle

Plantar flexor muscles of kangaroo rats (D. deserti) shorten at a velocity to produce optimal power during jumping

2021 ◽  
Author(s):  
M. Janneke Schwaner ◽  
David C. Lin ◽  
Craig P. McGowan
Keyword(s):  
Angular Velocity ◽  
Vastus Lateralis ◽  
Knee Extensor ◽  
Extensor Muscle ◽  
Joint Work ◽  
Shortening Velocity ◽  
Kangaroo Rats ◽  
Optimal Velocity ◽  
Muscle Shortening

During jumping by kangaroo rats, the musculotendon work contributions across all joints are not well understood. Namely, measures of external joint work do not provide information on the contributions from individual muscles or in-series elastic structures. In this study, we examined the functional roles of a major ankle extensor muscle, lateral gastrocnemius (LG), and of a major knee extensor muscle, vastus lateralis (VL), through in vivo sonomicrometry and electromyography techniques, during vertical jumping by kangaroo rats. Our data showed that both muscles increased shortening and activity with higher jumps. We found that knee angular velocity and VL muscle shortening velocity were coupled in time. In contrast, the ankle angular velocity and LG muscle shortening velocity were decoupled, and rapid joint extension near the end of the jump produced high power outputs at the ankle joint. Further, the decoupling of muscle and joint kinematics allowed the LG muscle to prolong the period of shortening velocity near optimal velocity (Vopt), which likely enabled the muscle to sustain maximal power generation. These observations were consistent with a LG tendon that is much more compliant than that of the VL.

The Roles of Sex and Physical Activity in Gait and Knee Extensor Function With Age

2019 ◽  
Vol 35 (4) ◽  
pp. 263-271
Author(s):  
Jocelyn F. Hafer ◽  
Mark S. Miller ◽  
Jane A. Kent ◽  
Katherine A. Boyer
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Muscle Function ◽  
Muscle Power ◽  
Knee Extensor ◽  
Extensor Muscle ◽  
Moderate Activity ◽  
Joint Mechanics ◽  
Gait Mechanics ◽  
Active Adults

Older females experience higher rates of disability than males, potentially due to sex-specific differences in gait and muscle function. The authors evaluated the effects of age and physical activity (PA) on gait mechanics and knee extensor muscle function in males and females. Three groups of 20 individuals (each 10 females) participated: young (21–35 y) and highly and less active older (55–70 y) adults. Knee extensor strength and joint mechanics during preferred speed gait were collected before and after 30 minutes of walking. Age by sex and PA by sex interactions indicated older and less active older females had lower concentric knee extensor muscle power and larger hip extension moments than males. After 30 minutes of walking, older less active adults had larger decreases in knee extensor power than their highly active older counterparts, and older adults of both sexes had decreases in ankle dorsiflexion moments while young adults did not. These results suggest that older, particularly less active, adults are susceptible to knee extensor muscle fatigue from moderate activity. For older adults, high levels of PA may be necessary to preserve gait mechanics in response to a bout of exercise. This new information may be important for targeting interventions in at-risk older adults.

Effects of 17-day spaceflight on knee extensor muscle function and size

2004 ◽  
Vol 93 (4) ◽  
pp. 463-468 ◽  
Author(s):  
Per A. Tesch ◽  
Hans E. Berg ◽  
Daniel Bring ◽  
Harlan J. Evans ◽  
Adrian D. LeBlanc
Keyword(s):  
Muscle Function ◽  
Knee Extensor ◽  
Extensor Muscle

Effects of Old age and contraction mode on knee extensor muscle ATP flux and metabolic economy in vivo

2021 ◽  
Author(s):  
Liam F. Fitzgerald ◽  
Miles F. Bartlett ◽  
Rajakumar Nagarajan ◽  
Ericber Jimenez Francisco ◽  
Frank C. Sup IV ◽  
...  
Keyword(s):  
Old Age ◽  
Knee Extensor ◽  
Extensor Muscle
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