Effect of knee joint cooling on the electromyographic activity of lower extremity muscles during a plyometric exercise

2010 ◽  
Vol 20 (6) ◽  
pp. 1075-1081 ◽  
Author(s):  
Stefan Schmid ◽  
Marilyn Moffat ◽  
Gregory M. Gutierrez
Keyword(s):  
Knee Joint ◽  
Lower Extremity ◽  
Electromyographic Activity ◽  
Plyometric Exercise

scholarly journals Design and analysis of a lower extremity exoskeleton with the humanoid knee joint

2020 ◽  
Vol 1633 ◽  
pp. 012052
Author(s):  
Tingting Li ◽  
Jian Li ◽  
Zhonghua Han ◽  
Jiechao Yang ◽  
Qiang Li
Keyword(s):  
Knee Joint ◽  
Lower Extremity

scholarly journals VASTUS LATERALIS OBLIQUE ACTIVITY DURING GAIT OF SUBJECTS WITH PATELLOFEMORAL PAIN

2017 ◽  
Vol 23 (2) ◽  
pp. 88-92
Author(s):  
Gilmar Moraes Santos ◽  
Karina Gramani Say ◽  
Flávio Pulzatto ◽  
Thiele de Cássia Libardoni ◽  
Larissa Milani Brognoli Sinhorim ◽  
...  
Keyword(s):  
Knee Joint ◽  
Vastus Lateralis ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
Flexion Angle ◽  
Oblique Muscle ◽  
Electromyographic Activity ◽  
Healthy Controls ◽  
Patellar Stability

ABSTRACT Introduction: So far, little is known about the behavior of electromyographic activity of vastus lateralis oblique muscle during treadmill gait in subjects with and without patellofemoral pain syndrome. Objective: The purpose of this study was to investigate the electromyographic activity of the patellar stabilizers muscles and the angle of the knee joint flexion in subjects with and without patellofemoral pain syndrome. Method: Fifteen subjects without (21 ± 3 years) and 12 with patellofemoral pain syndrome (20 ± 2 years) were evaluated. The electromyographic activity and flexion angle of the knee joint were obtained during gait on the treadmill with a 5 degree inclination. Results: The knee flexion angle was significantly lower in the subjects with patellofemoral pain syndrome when compared with the healthy controls. The electromyographic activity of vastus lateralis longus was significantly greater during gait on the treadmill with inclination in subjects with patellofemoral pain syndrome. The results also showed that the electromyographic activity of vastus lateralis oblique and vastus medialis oblique were similar in both groups, regardless of the condition (with/without inclination). Conclusion: We have shown that knee kinematics during gait differs among patients with and without patellofemoral pain syndrome and healthy controls and that a different motor strategy persists even when the pain is no longer present. In addition, the findings suggested that the vastus lateralis oblique has a minor role in patellar stability during gait.

Analyses of Gait and Jump Tasks in Female Obese Adolescents

2012 ◽  
Vol 24 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Filipe Ricardo Pires de Carvalho ◽  
Ana Teresa da Conceição Figueira Martins ◽  
Ana Maria Miranda Botelho Teixeira
Keyword(s):  
Lower Extremity ◽  
Fat Mass ◽  
Normal Weight ◽  
Female Adolescents ◽  
Electromyographic Activity ◽  
Countermovement Jump ◽  
Weight Group ◽  
Normal Weight Group ◽  
Additional Load ◽  
Task Differences

In spite of the advances in knowledge on the multi–factorial nature of obesity, many questions related to the consequences of the disease continue to be unanswered. Several studies have reported biomechanic and kinematic adaptation and alterations in walking and in tasks of every day life, motivated by the additional load of fat mass in children and adults. The main objective of this study was to understand the effect of obesity in the electromyographic activity of four lower extremity muscles during three speeds of walking and during a countermovement jump (CMJ) in twenty two (9 obese and 13 normal weight) female adolescents aged 13. Although electromyographic differences were not observed between groups for normal, slow and fast speeds, data suggests that the preferred pace of the obese is less efficient than that of the normal weight group. In CMJ task, differences in the after–fall jump phase were observed. More studies are needed to explain if the few differences observed between groups are caused by the bigger amount of fat mass.

Elevated Knee Joint Kinetics and Reduced Ankle Kinetics Are Present During Jogging and Hopping After Achilles Tendon Ruptures

2017 ◽  
Vol 45 (5) ◽  
pp. 1124-1133 ◽  
Author(s):  
Richard W. Willy ◽  
Annelie Brorsson ◽  
Hayley C. Powell ◽  
John D. Willson ◽  
Roy Tranberg ◽  
...  
Keyword(s):  
Knee Joint ◽  
Lower Extremity ◽  
Achilles Tendon ◽  
Patellofemoral Joint ◽  
Tendon Rupture ◽  
Achilles Tendon Rupture ◽  
Joint Power ◽  
Joint Stress ◽  
Joint Kinetics ◽  
Joint Loads

Background: Deficits in plantarflexor function are common after an Achilles tendon rupture. These deficits may result in an altered distribution of joint loads during lower extremity tasks. Hypothesis: We hypothesized that, regardless of treatment, the Achilles tendon–ruptured limb would exhibit deficits in ankle kinematics and joint power while exhibiting elevated knee joint power and patellofemoral joint loads during walking, jogging, and hopping. We further hypothesized that this loading pattern would be most evident during jogging and hopping. Study Design: Controlled laboratory study. Methods: Thirty-four participants (17 participants treated surgically, 17 treated nonsurgically) were tested at a mean 6.1 ± 2.0 years after an Achilles tendon rupture. Lower extremity kinematics and kinetics were assessed while participants completed walking, jogging, and single-legged hopping trials. Patellofemoral joint stress was calculated via a musculoskeletal model. Data were analyzed via mixed-model repeated analyses of variance (α = .05) and the limb symmetry index (LSI). Results: No differences ( P ≥ .05) were found between the surgical and nonsurgical groups. In both groups, large side-to-side deficits in the plantarflexion angle at toeoff (LSI: 53.5%-73.9%) were noted during walking, jogging, and hopping in the involved limb. Side-to-side deficits in the angular velocity were only present during jogging (LSI: 93.5%) and hopping (LSI: 92.5%). This pattern was accompanied by large deficits in eccentric (LSI: 80.8%-94.7%) and concentric (LSI: 82.2%-84.7%) ankle joint powers in the involved limb during all tasks. Interestingly, only jogging and hopping demonstrated greater knee joint loads when compared with the uninvolved limb. Concentric knee power was greater during jogging (LSI: 117.2%) and hopping (LSI: 115.9%) compared with the uninvolved limb. Similarly, peak patellofemoral joint stress was greater in the involved limb during jogging (LSI: 107.5%) and hopping (LSI: 107.1%), while only hopping had a greater loading rate of patellofemoral joint stress (LSI: 110.9%). Conclusion: Considerable side-to-side deficits in plantarflexor function were observed during walking, jogging, and hopping in patients after an Achilles tendon rupture. As a possible compensation, increased knee joint loads were present but only during jogging and hopping. Clinical Relevance: These data suggest that after an Achilles tendon rupture, patients may be susceptible to greater mechanical loading of the knee during sporting tasks, regardless of surgical or nonsurgical treatment.

The Relationship Between Early-Stage Knee Osteoarthritis and Lower-Extremity Alignment, Joint Laxity, and Subjective Scores of Pain, Stiffness, and Function

2016 ◽  
Vol 25 (3) ◽  
pp. 213-218
Author(s):  
Charlie A. Hicks-Little ◽  
Richard D. Peindl ◽  
Tricia J. Hubbard-Turner ◽  
Mitchell L. Cordova
Keyword(s):  
Knee Joint ◽  
Lower Extremity ◽  
Knee Osteoarthritis ◽  
Outcome Measures ◽  
Early Stage ◽  
Joint Laxity ◽  
Knee Oa ◽  
Lower Extremity Alignment ◽  
Knee Joint Laxity ◽  
And Function

Context:Knee osteoarthritis (OA) is a debilitating disease that affects an estimated 27 million Americans. Changes in lowerextremity alignment and joint laxity have been found to redistribute the medial and/or lateral loads at the joint. However, the effect that changes in anteroposterior knee-joint laxity have on lower-extremity alignment and function in individuals with knee OA remains unclear.Objective:To examine anteroposterior knee-joint laxity, lower-extremity alignment, and subjective pain, stiffness, and function scores in individuals with early-stage knee OA and matched controls and to determine if a relationship exists among these measures.Design:Case control.Setting:Sports-medicine research laboratory.Participants:18 participants with knee OA and 18 healthy matched controls.Intervention:Participants completed the Western Ontario McMaster (WOMAC) osteoarthritis questionnaire and were tested for total anteroposterior knee-joint laxity (A-P) and knee-joint alignment (ALIGN).Main Outcome Measures:WOMAC scores, A-P (mm), and ALIGN (°).Results:A significant multivariate main effect for group (Wilks’ Λ = 0.30, F7,26 = 8.58, P < .0001) was found. Knee-OA participants differed in WOMAC scores (P < .0001) but did not differ from healthy controls on ALIGN (P = .49) or total A-P (P = .66). No significant relationships were identified among main outcome measures.Conclusion:These data demonstrate that participants with early-stage knee OA had worse pain, stiffness, and functional outcome scores than the matched controls; however, ALIGN and A-P were no different. There was no association identified among participants’ subjective scores, ALIGN, or A-P measures in this study.

3-D BIODYNAMIC CONSTRAINT CONDITIONS WITH THREE SEGMENTS AND TWO ARTICULATING JOINTS ON THE HUMAN KNEE

2002 ◽  
Vol 14 (05) ◽  
pp. 183-188
Author(s):  
XISHI WANG ◽  
LI-QUN ZHANG
Keyword(s):  
Knee Joint ◽  
Lower Extremity ◽  
Patellofemoral Joint ◽  
Single Point ◽  
Point Contact ◽  
The Other ◽  
Human Knee ◽  
Human Knee Joint ◽  
Constraint Modeling ◽  
Biodynamic Modeling

In the paper, the 3-D biodynamic constraint conditions with three-segments (femur-patella-tibia) and two articulating joints (patellofemoral joint and tibiaofemoral joint) on the human knee are established. These constraint conditions of motion accommodate two situations: a two-point and a single-point contact on the patellofemoral joint and tibiaofemoral joint. On the other word, the present constraint modeling includes both rolling and sliding motions between the patella-femoral joint and tibia-femoral joint. This study can be explored a realistically 3-D biodynamic modeling of the human knee joint or human lower extremity.

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