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

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.

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

scholarly journals Knee Extensor Muscle Strength And The Depressive Status Among Older Japanese Women: A Cross-sectional Study

2021 ◽  
Vol 53 (8S) ◽  
pp. 196-197
Author(s):  
Ohta Takahisa ◽  
Hiroyuki Sasai ◽  
Narumi Kojima ◽  
Yosuke Osuka ◽  
Kiyoji Tanaka ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Knee Extensor ◽  
Cross Sectional Study ◽  
Japanese Women ◽  
Extensor Muscle ◽  
Sectional Study ◽  
Cross Sectional ◽  
Knee Extensor Muscle Strength

scholarly journals In vivo strain of the medial vs. lateral quadriceps tendon in patellofemoral pain syndrome

2009 ◽  
Vol 107 (2) ◽  
pp. 422-428 ◽  
Author(s):  
Nicole A. Wilson ◽  
Joel M. Press ◽  
Li-Qun Zhang
Keyword(s):  
Vastus Lateralis ◽  
Knee Extensor ◽  
Pain Syndrome ◽  
Quadriceps Tendon ◽  
Biomechanical Properties ◽  
Patellofemoral Pain ◽  
Control Subjects ◽  
Patellar Maltracking ◽  
Tendon Strain

Patellofemoral pain (PFP) is thought to be related to patellar maltracking due to imbalances in the knee extensor. However, no study has evaluated the in vivo biomechanical properties of the quadriceps tendon in PFP syndrome. Our purpose was to compare the biomechanical properties of the quadriceps tendons in vivo and noninvasively in patients with PFP syndrome to those of control subjects. The null hypothesis was that the quadriceps tendons of PFP subjects would have significantly decreased strain compared with control subjects. Fourteen subjects (7 control, 7 PFP) performed voluntary ramp isometric contractions to a range of torque levels, while quadriceps tendon elongation was measured using ultrasonography. Tendon strain was calculated for the vastus medialis obliquus (VMO) and vastus lateralis (VL) portion of the quadriceps tendon and compared between subjects (control vs. PFP) and within subjects (VMO vs. VL). PFP subjects showed significantly less VMO tendon strain than control subjects ( P < 0.001), but there was no difference in VL tendon strain between PFP and control subjects ( P = 0.100). Relative weakness of the VMO is the most likely cause of the decreased tendon strain seen in subjects with PFP. VMO weakness not only explains the decreased medial tendon strain but also explains the presence of increased lateral patellar translation and lateral patellar spin (distal pole rotates laterally) reported in the literature in this population. This technique can potentially be used in a clinical setting to evaluate quadriceps tendon properties and infer the presence of muscle weakness in PFP.

scholarly journals Knee extensor muscle weakness and radiographic knee osteoarthritis progression

2018 ◽  
Vol 89 (4) ◽  
pp. 406-411 ◽  
Author(s):  
Andrea Dell’isola ◽  
Wolfgang Wirth ◽  
Martijn Steultjens ◽  
Felix Eckstein ◽  
Adam G Culvenor
Keyword(s):  
Knee Osteoarthritis ◽  
Muscle Weakness ◽  
Knee Extensor ◽  
Extensor Muscle ◽  
Osteoarthritis Progression ◽  
Radiographic Knee Osteoarthritis
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