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Structural differences in the diaphragm of patients following controlled vs assisted and spontaneous mechanical ventilation.

PURPOSE: Ventilator-induced diaphragm dysfunction or damage (VIDD) is highly prevalent in patients under mechanical ventilation (MV), but its analysis is limited by the difficulty of obtaining histological samples. In this study we compared diaphragm histological characteristics in Maastricht III (MSIII) and brain-dead (BD) organ donors and in control subjects undergoing thoracic surgery (CTL) after a period of either controlled or spontaneous MV (CMV or SMV). METHODS: In this prospective study, biopsies were obtained from diaphragm and quadriceps. Demographic variables, comorbidities, severi

Quadriceps tendon autograft ACL reconstructed subjects overshoot target knee extension angle during active proprioception testing.

PURPOSE: To compare the active joint position sense (JPS), muscle strength, and knee functions in individuals who had anterior cruciate ligament (ACL) reconstruction with quadriceps tendon autograft, hamstring tendon autograft, tibialis anterior allograft and healthy individuals. It was hypothesized that when compared to an age and gender-matched healthy control group, subjects who were post-ACL reconstruction would display impaired active joint position sense, knee extensor and flexor strength symmetry and knee function at 1 year post-surgery. A secondary hypothesis was that differences would

Effects of maturation on combined female muscle strength and ACL structural factors.

OBJECTIVES: Relations between lower limb muscle strength and female ACL injury risk are well documented. How these relations combine with ke … o early (9.7±0.8yrs), middle (12.9±1.7yrs), and late (14.8±0.6yrs) maturation groups. Hamstring and quadriceps muscle volumes and ACL CSA measures were obtained. Isokinetic strength data were quantified for dominant knee flexors and extensors. Peak hamstring and quadriceps concentric and eccentric strength per unit volume magnitudes (QCSPV, HCSPV, QESPV, HESPV) wer …

Functions, disabilities and perceived health in the first year after total knee arthroplasty; a prospective cohort study.

BACKGROUND: In end-stage knee osteoarthritis total knee arthroplasty (TKA) is an effective intervention to reduce pain and improve functioning in the majority of patients. However, after TKA some patients still experience pain, loss of function, deficient muscle strength or reduced walking speed. This study systematically assesses patients' functions, disabilities and health before TKA and at short- (3 months) and long-term (12 months) on all International Classification of Functioning, Disability and Health domains. METHODS: In this prospective cohort study 150 patients underwent the followi

Quadriceps force and myoelectric activity during flexed knee stance.

The purpose of this study was to determine the quadriceps demand during single limb stance with the knee in five positions of flexion (0 deg … he knee joint, changing muscle moment arm length, and force ratio between the patellar ligament and quadriceps muscle with respect to knee angle are primary reasons for the quadratic normalized integrated EMG (NIEMG)-force nonlineality during flexed stance. This might indicate the existence of a critical angle of knee flexion contracture beyond which patients cope …

Strength and passive stiffness of the quadriceps are associated with patellar alignment in older adults with knee pain.

BACKGROUND: Maintaining normal patellar alignment is important for knee health. Altered activation of individual quadriceps muscles have been found related to patellar alignment. However, the relationships between strength and passive stiffness of the quadriceps and patellar alignment remains unexplored. METHODS: Participants aged between 60 and 80 years with activity-induced knee pain were recruited. Knee pain was quantified using an 11-point numeric rating scale. Quadriceps strength was assessed using a Cybex dynamometer and passive stiffness of rectus femoris, vastus lateralis, and vastus …

Quadriceps strength and knee joint function in patients with severe knee extension contracture following arthroscopic-assisted mini-incision quadricepsplasty.

PURPOSE: To evaluate reserve quadriceps function and improve knee activity in patients with severe knee extension contracture following arth … ESULTS: The median follow-up time was 2.1 years (1-5 years). The average QI was 92.0 ± 6.2, and the quadriceps muscle strength was increased from 3.28 to 4.72. At the final follow-up, 90% of the patients had no difficulty going upstairs, going downstairs, or rising from a chair. The ROM improved by 25.69 ± 3.6 preoperatively to 105.88 ± 6.6 at the final follow-up ( …

Quadriceps weakness in knee osteoarthritis: the effect on pain and disability.

OBJECTIVES: (1) To determine the importance of quadriceps strength, structural change, and psychological status in terms of knee pain in the community. (2) To determine the relative importance of quadriceps function, structural change, and psychological status with respect to disability in subjects with knee pain. METHODS: 300 men and women with pain and 300 controls without pain (aged 40-79) were seen. Isometric quadriceps strength (MVC) was measured and muscle activation was assessed by twitch superimposition. Disability (Western Ontario McMaster Osteoarthritis Index (WOMAC)) and anxiety an

Воздействие изокинетических упражнений на баланс, проприоцепление, качество жизни и кинезиофобия при множественном склерозе.

AIM: Оценка воздействия изокинетической резьбы и квадрицепса (IGM)-укрепления и домашних учений на сбалансированной основе, proprioception, боязни падения (FoF), кинезиофобии и качества жизни у лиц с множественным склерозом (PwMS). МЕТОДЫ: пиковый крутящий момент/масса тела МГМА, абсолютная угловая погрешность (AAE) и среднее значение AAE менее и более затронутых ног, а также оценки динамического индекса гейта, 10-метрового пешеходного испытания, шкалы баланса Берга (BBS), изменяемой шкалы эффективности водопадов, качества многоразового склероза 54 (MSQOL-54), Визуальная аналоговая шкала и шка

Совпадение в аннотации оригинала
AIM: To evaluate the effects of isokinetic hamstring and quadriceps muscle (IHGM)-strengthening and home exercises on balance, proprioception, fear of falling (FoF), kinesiophobia, and quality of life in persons with multiple sclerosis (PwMS). METHODS: The peak torque/body mass of the IHGMs, the absolute angular error (AAE) and mean AAE of the less and more…

Joint Effusion at 3 Months After Anterior Cruciate Ligament Reconstruction: Its Risk Factors and Association With Subsequent Muscle Strength and Graft Remodeling.

BACKGROUND: Joint effusion at 3 months after anterior cruciate ligament (ACL) reconstruction is a risk factor for ACL reinjury. However, factors associated with joint effusion at 3 months postoperatively and the effect of joint effusion on subsequent quadriceps muscle strength and graft remodeling remain unknown. PURPOSES: To identify factors associated with joint effusion and investigate the association between joint effusion and quadriceps muscle strength and graft remodeling in the postoperative period. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: In this retrospectiv…

Open kinetic chain exercises in a restricted range of motion after anterior cruciate ligament reconstruction: a randomized controlled clinical trial.

BACKGROUND: Recent studies have shown that an early start of open kinetic chain (OKC) exercises for quadriceps strengthening in a full range … onth assessments when compared with 12 weeks postoperatively (P < .05). The EOKC group had improved quadriceps muscle strength at the 19-week, 25-week, and 17-month follow-up when compared with 12 weeks postoperatively (P < .05); the LOKC group showed improvement only at the 17-month postoperative assessment. However, the analysis between groups showed no differenc …

Inter-individual differences in the utilization of elastic energy during running affect the quadriceps femoris volume in highly trained/elite distance runners.

The quadriceps femoris is larger in inferior distance runners than in superior distance runners within a cohort of competitive athletes (i.e., highly trained/elite runners). We hypothesize that distance runners who are less efficient at utilizing elastic energy during running show excessive hypertrophy of the quadriceps femoris. This study aimed to examine the relationship between thigh muscle size and indices of elastic energy utilization during running in highly trained/elite distance runners. Fifteen male distance runners (personal best time for 5000-m, 13'45″11 ± 19″91) participated. The v

Selective activation of muscle groups in the feline hindlimb through electrical microstimulation of the ventral lumbo-sacral spinal cord.

Selective activation of muscle groups in the feline hindlimb by electrical stimulation of the ventral lumbo-sacral spinal cord was investigated. Spinal cord segments L5 to S1 were mapped using a penetrating tungsten needle electrode. Locations that produced isolated contraction of quadriceps, tibialis anterior or triceps surae/plantaris muscles when stimulated with a current of 40 microA or less, and in which spread of activity to other muscles was not detected after increasing the stimulus to at least twice the threshold level, were defined as belonging to the target muscle's "activation pool

Electrical stimulation of vastus medialis and stretching of lateral thigh muscles in patients with patello-femoral symptoms.

Thirty patients with unilateral patello-femoral symptoms and a hypotrophic vastus medialis muscle were treated with transcutaneous electrical stimulation of the vastus medialis obliquus and stretching of the lateral thigh muscles twice daily for 10 weeks. Before and after treatment the position of the patella at fixed knee flexion angles and the area of the vastus medialis and vastus lateralis muscles were studied by computed tomography. Isokinetic quadriceps torque was registered with a Cybex II Dynamometer. An evaluation with a functional knee score was carried out. The healthy contralateral

Silymarin Attenuates Arthritis and Myositis in a Murine Model of Acute Infection by Chikungunya and Mayaro Viruses.

The alphaviruses chikungunya (CHIKV) and Mayaro (MAYV) are responsible for acute febrile illnesses often accompanied by severe and persisten … al, and paw tissues, the number and area of lymphoid nodules in the spleen, and TNF-α levels in the quadriceps muscle and paw, thereby supporting its therapeutic potential against CHIKV and MAYV infections.

Applying a hexapod circular frame to gradually correct persistent knee flexion due to congenital aplasia of the quadriceps-a case report and review of the literature.

Congenital aplasia or hypoplasia of the quadriceps muscle are rare conditions that significantly impair the extension of the knee joint, resulting in a sustained flexion deformity. These conditions alter overall gait quality, impede daily activities and require effective, timely intervention. Surgical techniques for correction have been described, including soft-tissue release, guided growth, tendon transfer and external fixators. Among the external fixators available, hexapod circular frames are probably the most effective because they enable the precise, progressive correction of complex mul…

Functional results after surgical repair of quadriceps tendon rupture.

We present the long-term results of surgical repair of a traumatic rupture of the quadriceps tendon in a group of 24 patients with a mean age of 58 years. There were 21 male and 3 female patients. Fifteen patients were seen for clinical control after a mean follow-up of 75 months and they all presented with some quadriceps muscle atrophy. Twelve patients had normal knee mobility, three had a flexion deformity of 10 degrees and two had less than 120 degrees of knee flexion. Active knee extension was normal in all patients. Three patients experienced some decrease in stability of their knee join…

The Passive Mechanical Properties of Muscles and Tendons in Children Affected by Osgood-Schlatter Disease.

BACKGROUND: Osgood-Schlatter disease (OSD) is a sports-related disorder involving apophysitis, which affects the tibial tuberosity. The identification of factors related to OSD is important for its prevention and early recovery from the disease. This study aimed to compare the passive mechanical properties of the muscle-tendon unit in children affected by an OSD and healthy children, by using ultrasound real-time tissue elastography. METHODS: Eighteen legs affected by OSD (OSD group) and 42 healthy legs (control: CON group) were assessed. The elasticity was obtained from the quadriceps muscle…

Statistical mapping of the effect of knee extension on thigh muscle viscoelastic properties using magnetic resonance elastography.

Skeletal muscle viscoelastic properties reflect muscle microstructure and neuromuscular activation. Elastographic methods, including magnetic resonance elastography, have been used to characterize muscle viscoelastic properties in terms of region of interest (ROI) measurements. The present study extended this approach to create thresholded pixel-by-pixel maps of viscoelastic properties of skeletal muscle during rest and knee extension in eleven subjects. ROI measurements were taken for individual quadricep muscles and the quadriceps region as a whole, and the viscoelastic parameter map pixels

Electromyographic analysis of muscle fatigue in anterior cruciate ligament deficient knees.

The aim of this study was to detect possible differences in muscle fatigue and recovery of knee flexor and extensor muscles in patients with a deficient anterior cruciate ligament compared with patients with a normal anterior cruciate ligament. Surface electromyography of 15 patients with anterior cruciate ligament deficiency was performed while the muscles were under 80% of maximum isometric contraction, and after 1, 2, 3, and 5 minutes of rest. During the first 60 seconds of contraction, all muscles recorded significantly decreased mean power frequency and increased amplitude. The rate of de