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Comparisons of muscle strength and power in females with above and below average hamstrings-to-quadriceps ratio across the velocity spectrum.

BACKGROUND/PURPOSE: Females with above average hamstrings-to-quadriceps ratio (HTQ) will have superior peak torque (PT), mean power (MP), and HTQ compared to those with below average HTQ. METHODS: 27 college-aged females participated. PT and MP was taken from maximal voluntary isometric contractions (MVICs) and isokinetic knee extensions and flexions performed at 60-300°·s-1 for each leg. HTQ was the ratio of PT from knee flexion and extension. Subjects were separated into above and below average HTQ groups for each leg and velocity. ANOVAs examined differences in HTQ, PT, and MP across group

Differences in Strength, Muscle Work, and Hamstring/Quadriceps Ratio in Professional and Junior Elite Basketball Players According to Sex.

Background: Anterior cruciate ligament (ACL) injury is more prevalent in young athletes and women. A deficit of knee flexor strength and a H/Q strength ratio below 0.6 in athletes are risk factors. Therefore, the main objective of this study is to determine if there are differences in the strength of the knee musculature, joint work, and H/Q ratio between professional and junior elite basketball players and sexes, since there are differences in the incidence of ACL injuries between these groups. Methods: Forty-three professional (27 male and 16 female) and 42 junior elite (28 male and 14 femal

Is there a relationship between knee crepitus with quadriceps muscle thickness and strength in individuals with patellofemoral pain? A cross-sectional study.

OBJECTIVE: To explore the relationship between knee crepitus, quadriceps muscle thickness and isometric strength in individuals with patellofemoral pain (PFP). DESIGN: Cross-sectional. PARTICIPANTS: Individuals with PFP. MAIN OUTCOME MEASURES: Participants with PFP underwent assessments for presence, frequency and severity of knee crepitus. Real-time ultrasound images of the quadriceps muscles (rectus femoris, vastus medialis and lateralis) at rest and during contraction were obtained, muscle thickness was measured in both conditions. Maximal voluntary isometric contraction tests were perfo…

Differential Effects of Quadriceps and Hip Muscle Exercises for Patellofemoral Pain: A Secondary Effect Modifier Analysis of a Randomized Trial.

OBJECTIVES: To identify baseline characteristics that modified the effect of a 12-week quadriceps-focused (QE) vs hip muscle-focused (HE) exercise program on symptoms and physical function, through changes at baseline in the Anterior Knee Pain Scale (AKPS) in patients with PFP. DESIGN: A secondary analysis of a 26-week randomized trial involving 200 participants with patellofemoral pain. METHODS: Participants were randomly assigned to a QE or HE program with a duration of 12 weeks. The primary outcome was change from baseline in the AKPS at week 12 and week 26. Subgroups were predefined and ba

Effect of conventional transcranial direct current stimulation devices and electrode sizes on motor cortical excitability of the quadriceps muscle.

BACKGROUND: There is a growing concern among the scientific community that the effects of transcranial direct current stimulation (tDCS) are highly variable across studies. The use of different tDCS devices and electrode sizes may contribute to this variability; however, this issue has not been verified experimentally. OBJECTIVE: To evaluate the effects of tDCS device and electrode size on quadriceps motor cortical excitability. METHODS: The effect of tDCS device and electrode size on quadriceps motor cortical excitability was quantified across a range of TMS intensities using a novel evoked

Congenital total absence of the quadriceps muscle and patella: a case report with computed tomography scan and three-dimensional reconstructions.

In this study, we present three-dimensional computed tomography (CT) scan image findings of a case with congenital total absence of the quadriceps muscle and patella and partial absence of the sartorius muscle, which caused fixed flexion contracture of the knee joint. Physical examination, radiography, three-dimensional CT scan, and chromosome analysis of the patient were done. On physical examination, the knee joint was at 85 degree fixed flexion contracture. Radiographic views demonstrated soft tissue defects around left femur. Chromosome analysis was normal. CT scan showed total absence of …

Magnetic resonance measurements of the deviation of the angle of force generated by contraction of the quadriceps muscle in dogs with congenital patellar luxation.

OBJECTIVE: To measure the quadriceps angle (Q-angle) in dogs with congenital patellar luxation using magnetic resonance (MR) methods. STUDY DESIGN: Prospective clinical study. ANIMALS: Thirty-eight client-owned dogs. METHODS: Thirty-eight dogs were examined and placed into the following groups based on the degree of patellar instability: normal, grade I, grade II, and grade III. MR images of 37 pelvic limbs without patellar instability, 33 pelvic limbs with patellar luxation, and 6 limbs with cranial cruciate ligament (CrCL) rupture were made. The Q-angle was calculated using trigonometric

Applied nutritional investigation determinants of lower quadriceps skeletal muscle measured by ultrasound at ICU admission: a cross-sectional analysis.

BACKGROUND: Low skeletal muscle (SM) is common at ICU admission and is associated with worse prognosis. Early identification of at-risk pati … nutritional data were obtained through anamnesis, while clinical data were extracted from records. Quadriceps muscle layer thickness (QMLT) was measured using a B-mode US. Lower QMLT was defined as values below the sex-specific 25th percentile of the sample. Binary logistic regression was performed. RESULTS: 399 patients were included (age 61.4 ± 14.9 years; 56.6 …

No quadriceps muscle weakness following anterior quadratus lumborum block compared with placebo: a randomized, non-inferiority, blinded, volunteer trial.

BACKGROUND AND AIMS: Anterior quadratus lumborum block is a truncal block, applied in close proximity to the lumbar plexus, potentially causing lower limb weakness. This trial aimed to evaluate whether a unilateral anterior quadratus lumborum block caused quadriceps muscle weakness compared with placebo. METHODS: In this randomized, non-inferiority, triple-blind trial, 20 healthy volunteers received an active unilateral anterior quadratus lumborum block with 30 mL ropivacaine 0.75% and a placebo block on the contralateral side. Primary outcome was change in maximal quadriceps muscle strength …

Localized bioelectric impedance parameters can predict quadriceps muscle strength, but not independently from lean soft tissue in young adults.

OBJECTIVE: To verify the relationship between muscular strength, determined by an isokinetic dynamometer, and the parameters of whole-body and localized bioelectrical impedance analysis (WB-BIA and L-BIA) in young adults of both sexes. METHODS: This is a cross-sectional study involving 66 university students (ages 18 to 30, 41 women). Dual-energy X-ray absorptiometry (DXA) was used to determine lean soft tissue (LST in kg). Resistance (R), reactance (Xc), and phase angle (PhA) were assessed both for whole-body and localized (thigh) measurements using a 50 kHz tetrapolar unifrequency BIA devic

Quadriceps muscle strength of adolescents recovers faster than those of adults after anterior cruciate ligament reconstruction using hamstring graft.

OBJECTIVES: Knee muscle strength recovery after anterior cruciate ligament reconstruction is usually evaluated using isokinetic limb symmetry index to help take the decision to allow return to the previous sport. However, the role of age on knee strength recovery is not well known. So, we aimed to compare the isokinetic knee muscle strength recovery according to age at 4 and 7 months after anterior cruciate ligament reconstruction using hamstring graft. METHODS: From a historical cohort (2018-2023) of patients who completed isokinetic monitoring at 4 and 7 months after anterior cruciate ligam

Curcumin regulates autophagy through SIRT3-SOD2-ROS signaling pathway to improve quadriceps femoris muscle atrophy in KOA rat model.

Knee osteoarthritis (KOA) usually leads to quadriceps femoris atrophy, which in turn can further aggravate the progression of KOA. Curcumin (CUR) has anti-inflammatory and antioxidant effects and has been shown to be a protective agent for skeletal muscle. CUR has been shown to have a protective effect on skeletal muscle. However, there are no studies related to whether CUR improves KOA-induced quadriceps femoris muscle atrophy. We established a model of KOA in rats. Rats in the experimental group were fed CUR for 5 weeks. Changes in autophagy levels, reactive oxygen species (ROS) levels, and

The Influence of Hip and Knee Joint Angles on Quadriceps Muscle-Tendon Unit Properties during Maximal Voluntary Isometric Contraction.

Determining how the quadriceps femoris musculotendinous unit functions, according to hip and knee joint angles, may help with clinical decisions when prescribing knee extension exercises. We aimed to determine the effect of hip and knee joint angles on structure and neuromuscular functioning of all constituents of the quadriceps femoris and patellar tendon properties. Twenty young males were evaluated in four positions: seated and supine in both 20° and 60° of knee flexion (SIT20, SIT60, SUP20, and SUP60). Peak knee extension torque was determined during maximal voluntary isometric contraction

Comparison of the Levels of Pro-Inflammatory Cytokines Released in the Vastus Lateralis Muscle of Patients with Fibromyalgia and Healthy Controls during Contractions of the Quadriceps Muscle--A Microdialysis Study.

OBJECTIVE: Fibromyalgia is associated with central hyperexcitability, but it is suggested that peripheral input is important to maintain central hyperexcitability. The primary aim was to investigate the levels of pro-inflammatory cytokines released in the vastus lateralis muscle during repetitive dynamic contractions of the quadriceps muscle in patients with fibromyalgia and healthy controls. Secondarily, to investigate if the levels of pro-inflammatory cytokines were correlated with pain or fatigue during these repetitive dynamic contractions. MATERIAL AND METHODS: 32 women with fibromyalgia…

Heterogeneity of Quadriceps Muscle Volume in Knee Osteoarthritis: A Latent Profile Analysis and Its Clinical Implications for Arthroplasty Outcomes.

BACKGROUND: Knee osteoarthritis (KOA) is characterized by complex structural and muscular alterations. Quadriceps muscle atrophy is a critical, but heterogeneous feature influencing pain, function, and postoperative recovery. Understanding muscle phenotypes may provide novel insight into disease heterogeneity and guide personalized rehabilitation. METHODS: This retrospective study included 191 consecutive patients undergoing primary robot-assisted total knee arthroplasty (TKA; 76.4% women; mean age 67 years (range 46 to 86)), with preoperative computed tomography (CT) imaging and six-month fo…

Tale of quadriceps and hamstring muscle strength after ACL reconstruction: a systematic review with longitudinal and multivariate meta-analysis.

OBJECTIVE: This study aimed to investigate how knee extensor and flexor strength change over time after anterior cruciate ligament reconstruction (ACLR). DESIGN: Systematic review with longitudinal meta-analysis. DATA SOURCES: Medline, Embase, CINAHL, Scopus, Cochrane CENTRAL and SPORTDiscus to 28 February 2023. ELIGIBILITY CRITERIA: Studies of primary ACLR (n≥50), with mean participant age 18-40 years, reporting a quantitative measure of knee extensor or flexor strength were eligible. Muscle strength had to be reported for the ACL limb and compared with: (1) the contralateral limb (within-

The Effects of Dry Needling the Quadriceps or Gluteal Muscle Groups in the Multimodal Management of Patellofemoral Pain: A Critically Appraised Topic.

CLINICAL SCENARIO: Patellofemoral pain (PFP) places a large burden on patients and the larger health care system. Current best evidence sugg … ement of PFP and fail to evaluate DDN as part of multimodal treatment, and only evaluate DDN of the quadriceps muscle group. This critically appraised topic evaluates the literature on inclusion of DDN as part of the multimodal treatment of PFP exploring multiple muscle groups impacting PFP. CLINICAL QUESTION: In patients with PFP, does the inclusion of dry needli …

Пространственно распределенная последовательная стимуляция применяется к парализованным квадрицепсам при циклическом движении FES с помощью двигателя.

Пространственное распределение последовательной стимуляции (SDSS) продемонстрировало более высокую способность к снижению усталости и выходную мощность при осуществлении изометрических или изокинетических сокращений парализованных квадрицепсов по сравнению с эквивалентными функциональными стимуляторами (FES) в одной конфигурации стимулятора электрода (SES). Целью настоящего исследования является систематическая оценка выходной мощности и факторов, снижающих усталость, которые применяются в отношении парализованных квадрицепсов субъектов, осуществляющих циклическое движение FES с помощью двигат

Совпадение в аннотации оригинала
Spatially distributed sequential stimulation (SDSS) demonstrated greater fatigue-reducing ability and power output when performing isometric or isokinetic contractions of the paralyzed quadriceps muscles compared to the equivalent conventional functional electrical stimulation (FES) in a single electrode stimulation (SES) configuration. The present study aim…

Altered cell metabolism in tissues of the knee joint in a rabbit model of Botulinum toxin A-induced quadriceps muscle weakness.

Quadriceps muscle weakness is frequently associated with knee injuries in sports. The influence of quadriceps weakness on knee joint homeostasis remains undefined. We hypothesized that quadriceps weakness will lead to tissue-specific alterations in the cell metabolism of tissues of the knee. Quadriceps weakness was induced with repetitive injections of Botulinum toxin A in six 1-year-old New Zealand White rabbits for 6 months. Five additional animals served as controls with injections of saline/dextrose. Muscle weakness was assessed by muscle wet mass, isometric knee extensor torque, and histo…