scholarly journals Quantitative MRI of Vastus Medialis, Vastus Lateralis and Gluteus Medius Muscle Workload after Squat Exercise: Comparison Between Squatting with Hip Adduction and Hip Abduction

2012 ◽  
Vol 33 (1) ◽  
pp. 5-14 ◽  
Author(s):  
Augusto Baffa ◽  
Lilian Felicio ◽  
Marcelo Saad ◽  
Marcello Nogueira-Barbosa ◽  
Antonio Santos ◽  
...  
Keyword(s):  
Clinical Symptoms ◽  
Vastus Lateralis ◽  
Gluteus Medius ◽  
Quantitative Mri ◽  
Vastus Medialis ◽  
Gluteus Medius Muscle ◽  
Limb Injuries ◽  
Squat Exercise ◽  
Before And After ◽  
Hip Abduction

Quantitative MRI of Vastus Medialis, Vastus Lateralis and Gluteus Medius Muscle Workload after Squat Exercise: Comparison Between Squatting with Hip Adduction and Hip AbductionThe aim of the present study was to evaluate the use MRI to quantify the workload of gluteus medius (GM), vastus medialis (VM) and vastus lateralis (VL) muscles in different types of squat exercises. Fourteen female volunteers were evaluated, average age of 22 ± 2 years, sedentary, without clinical symptoms, and without history of previous lower limb injuries. Quantitative MRI was used to analyze VM, VL and GM muscles before and after squat exercise, squat associated with isometric hip adduction and squat associated with isometric hip abduction. Multi echo images were acquired to calculate the transversal relaxation times (T2) before and after exercise. Mixed Effects Model statistical analysis was used to compare images before and after the exercise (ΔT2) to normalize the variability between subjects. Imaging post processing was performed in Matlab software. GM muscle was the least active during the squat associated with isometric hip adduction and VM the least active during the squat associated with isometric hip abduction, while VL was the most active during squat associated with isometric hip adduction. Our data suggests that isometric hip adduction during the squat does not increase the workload of VM, but decreases the GM muscle workload. Squat associated with isometric hip abduction does not increase VL workload.

Pelvic Limb Kinematics and Surface Electromyography of the Vastus Lateralis, Biceps Femoris, and Gluteus Medius Muscle in Dogs with Hip Osteoarthritis

2011 ◽  
Vol 41 (1) ◽  
pp. 54-62 ◽  
Author(s):  
Barbara Bockstahler ◽  
Cordula Kräutler ◽  
Peter Holler ◽  
Alexander Kotschwar ◽  
Angela Vobornik ◽  
...  
Keyword(s):  
Surface Electromyography ◽  
Vastus Lateralis ◽  
Hip Osteoarthritis ◽  
Gluteus Medius ◽  
Biceps Femoris ◽  
Gluteus Medius Muscle ◽  
Limb Kinematics ◽  
Pelvic Limb

Decrease in maximal voluntary contraction by tonic vibration applied to a single synergist muscle in humans

2000 ◽  
Vol 89 (4) ◽  
pp. 1420-1424 ◽  
Author(s):  
Motoki Kouzaki ◽  
Minoru Shinohara ◽  
Tetsuo Fukunaga
Keyword(s):  
Maximal Voluntary Contraction ◽  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Knee Extension ◽  
Voluntary Contraction ◽  
Vastus Medialis ◽  
Force Development ◽  
Ia Afferent ◽  
Before And After ◽  
Integrated Emg

The purpose of the study was to examine the effect of prolonged tonic vibration applied to a single synergist muscle on maximal voluntary contraction (MVC) and maximal rate of force development (dF/d t max). The knee extension MVC force and surface electromyogram (EMG) from the rectus femoris (RF), vastus lateralis (VL), and vastus medialis (VM) during MVC were recorded before and after vibration of RF muscle at 30 Hz for 30 min. MVC, dF/d t max, and the integrated EMG (iEMG) of RF decreased significantly after prolonged tonic vibration in spite of no changes in iEMG of VL and VM. The present results indicate that MVC and dF/d t max may be influenced by the attenuated Ia afferent functions of a single synergist muscle.

scholarly journals Laterality of Gluteus Medius Muscle Activity during Hip Abduction

2016 ◽  
Vol 31 (2) ◽  
pp. 285-288
Author(s):  
Yujiro MASU ◽  
Sayo KURASAWA ◽  
Hiroyasu KOYAMA ◽  
Mizuki KAWATE ◽  
Yasuhiro YAMAMOTO
Keyword(s):  
Muscle Activity ◽  
Gluteus Medius ◽  
Gluteus Medius Muscle ◽  
Hip Abduction

Effects of a draft-loaded interval-training program on skeletal muscle in the horse

1989 ◽  
Vol 67 (2) ◽  
pp. 570-577 ◽  
Author(s):  
M. Gottlieb ◽  
B. Essen-Gustavsson ◽  
A. Lindholm ◽  
S. G. Persson
Keyword(s):  
Citrate Synthase ◽  
Interval Training ◽  
Gluteus Medius ◽  
Type I ◽  
Gluteus Medius Muscle ◽  
Significant Difference ◽  
Gluteus Muscle ◽  
Before And After ◽  
Draft Resistance ◽  
Type I Fibers

Five Standardbred trotters were trained on a treadmill 3 times/wk for 12 wk by intervals of draft-loaded exercise. The draft load was 34 kp and the velocity approximately 7 m/s. Muscle biopsies were taken from the gluteus medius and longissimus muscles before training and after 2, 4, 8, and 12 wk of training and from the brachiocephalicus muscle before and after training. Both the percentage and the area of type IIa fibers increased and the percentage of type IIb fibers decreased in the gluteus medius muscle during the first 2 wk of training, and then no further significant difference was noted. The percentage of type I fibers increased in the brachiocephalicus muscle, and the area of type IIb fibers increased in the longissimus muscle. The citrate synthase activity increased in the gluteus muscle only, and the increase was seen during the first 2 wk. No significant differences were seen in 3-hydroxy-acyl-CoA dehydrogenase and lactate dehydrogenase activities in the muscles during the entire training period. Less glycogen was utilized in the gluteus muscle and less blood lactate accumulated when the horses performed an unloaded submaximal exercise test after compared with before training. It can be concluded that rapid changes are induced in the gluteus medius muscle when horses are trained pulling a light-draft resistance at a submaximal trotting speed.

scholarly journals Neuromuscular Changes After Aerobic Exercise in People with Anterior Cruciate Ligament– Reconstructed Knees

2011 ◽  
Vol 46 (5) ◽  
pp. 476-483 ◽  
Author(s):  
Elizabeth C. Dalton ◽  
Kate R. Pfile ◽  
Gerald R. Weniger ◽  
Christopher D. Ingersoll ◽  
Daniel Herman ◽  
...  
Keyword(s):  
Aerobic Exercise ◽  
Muscle Activation ◽  
Dynamic Balance ◽  
Cruciate Ligament ◽  
Vertical Jump ◽  
Gluteus Medius ◽  
Gluteus Medius Muscle ◽  
Vertical Jump Height ◽  
Hip Abduction ◽  
Anterior Cruciate

Context: Anterior cruciate ligament (ACL) reconstructions are common, especially in young, active people. The lower extremity neuromuscular adaptations seen after aerobic exercise provide information about how previously injured patients perform and highlight deficits and, hence, areas for focused treatment. Little information is available about neuromuscular performance after aerobic exercise in people with ACL reconstructions. Objective: To compare dynamic balance, gluteus medius muscle activation, vertical jump height, and hip muscle strength after aerobic exercise in people with ACL-reconstructed knees. Design: Case-control study. Setting: Research laboratory. Patients or Other Participants: Of 34 recreationally active volunteers, 17 had a unilateral primary ACL reconstruction at least 2 years earlier and 17 were matched controls. Intervention(s): All participants performed 20 minutes of aerobic exercise on a treadmill. Main Outcome Measure(s): We recorded dynamic, single-legged balance electromyographic gluteus medius muscle activation, single-legged vertical jump height, and maximum isometric strength for hip abduction, extension, and external rotation preexercise and postexercise. Results: Participants with ACL reconstructions exhibited shorter reach distances during dynamic balance tasks, indicating poorer dynamic balance, and less gluteus medius muscle electromyographic activation. Reductions in hip abduction and extension strength after exercise were noted in all participants; however, those with ACL reconstructions displayed greater hip extensor strength loss after aerobic exercise than did the control group. Conclusions: Neuromuscular changes after aerobic exercise exist in both patients with ACL reconstructions and controls. The former group may experience greater deficits in hip extensor strength after aerobic exercise. Reduced reach distances in people with ACL reconstructions may represent a protective mechanism against excessive tibiofemoral rotation during dynamic balance. Clinicians should identify weaknesses in the resting state and after aerobic exercise in recreationally active patients and those with ACL reconstructions.

Sign in / Sign up

Export Citation Format

Share Document