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Quadriceps activation

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https://www.readbyqxmd.com/read/28210647/association-of-quadriceps-strength-and-psychosocial-factors-with-single-leg-hop-performance-in-patients-with-meniscectomy
#1
Chao-Jung Hsu, Steven Z George, Terese L Chmielewski
BACKGROUND: Clinicians use the single-leg hop test to assess readiness for return to sports after knee injury. Few studies have reported the results of single-leg hop testing after meniscectomy. Additionally, the contributions of impairments in quadriceps strength and psychosocial factors to single-leg hop performance are unknown. PURPOSE: To compare single-leg hop performance (distance and landing mechanics) between limbs and to examine the association of single-leg hop performance with quadriceps strength and psychosocial factors in patients with meniscectomy...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28210029/gender-related-differences-in-lower-limb-alignment-range-of-joint-motion-and-the-incidence-of-sports-injuries-in-japanese-university-athletes
#2
Yasuhiro Mitani
[Purpose] To investigate the gender-related differences in lower limb alignment, range of joint motion, and history of lower limb sports injuries in Japanese university athletes. [Subjects and Methods] The subjects were 224 Japanese university athletes (154 males and 70 females). The quadriceps angle (Q-angle), arch height index, and ranges of internal and external rotation of the hip joints were measured. History of lower limb sports injury was surveyed using a questionnaire. [Results] Females had a significantly higher Q-angle and hip joint internal rotation angle and a significantly lower arch height index than males...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28207951/endurance-capacity-and-neuromuscular-fatigue-following-high-vs-moderate-intensity-endurance-training-a-randomised-trial
#3
Thomas J O'Leary, Johnny Collett, Ken Howells, Martyn G Morris
High-intensity exercise induces significant central and peripheral fatigue, however the effect of endurance training on these mechanisms of fatigue is poorly understood. We compared the effect of cycling endurance training of disparate intensities on high-intensity exercise endurance capacity and the associated limiting central and peripheral fatigue mechanisms. Twenty adults were randomly assigned to 6 weeks of either high-intensity interval training (HIIT, 6-8 × 5 min at halfway between lactate threshold and maximal oxygen uptake [50%Δ]) or volume matched moderate-intensity continuous training (CONT, ~60-80 min at 90% lactate threshold)...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28203599/surgical-management-of-rectus-femoris-avulsion-among-professional-soccer-players
#4
Bertrand Sonnery-Cottet, Nuno Camelo Barbosa, Sanesh Tuteja, Roland Gardon, Matt Daggett, Damien Monnot, Charles Kajetanek, Mathieu Thaunat
BACKGROUND: Rectus femoris injuries are common among athletes, especially in kicking sports such as soccer; however, proximal rectus femoris avulsions in athletes are a relatively rare entity. PURPOSE/HYPOTHESIS: The purpose of this study was to describe and report the results of an original technique of surgical excision of the proximal tendon remnant followed by a muscular suture repair. Our hypothesis was that this technique limits the risk of recurrence in high-level athletes and allows for rapid recovery without loss of quadriceps strength...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28203021/-comparision-for-clinical-efficiency-of-continuous-adductor-canal-block-and-femoral-nerve-block-in-total-knee-arthroplasty
#5
M W Zhao, N Wang, L Zeng, M Li, Z K Zhao, H Zhang, H Tian
OBJECTIVE: To compare the pain control efficiency of continuous adductor canal block (ACB) and femoral nerve block (FNB) in total knee arthroplasty. METHODS: From April to September 2016, patients with severe knee osteoarthritis undergoing primary unilateral total knee arthroplasty (TKA) were prospectively observed, and all the patients were randomized received ultrasound-guided continuous ACB or FNB after surgery. Numeric pain rating scales(NPRS)pain scores in rest and activity 2, 6, 12, 24 and 48 h after surgery were collected, and the preoperative and postoperative quadriceps strength at 24 and 48 h were analyzed...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28195986/functional-bracing-after-anterior-cruciate-ligament-reconstruction-a-systematic-review
#6
Walter R Lowe, Ryan J Warth, Elizabeth P Davis, Lane Bailey
INTRODUCTION: The purpose of this study was to evaluate the current literature on the use of functional knee braces after anterior cruciate ligament (ACL) reconstruction with respect to clinical and in vivo biomechanical data. METHODS: A systematic search of both the PubMed and Embase databases was performed to identify all studies that reported clinical and/or in vivo biomechanical results of functional bracing versus nonbracing after ACL reconstruction. Extracted data included study design, surgical reconstruction techniques, postoperative rehabilitation protocols, objective outcomes, and subjective outcomes scores...
March 2017: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/28192829/tens-alleviates-muscle-weakness-attributable-to-attenuation-of-ia-afferents
#7
Y Konishi, P J McNair, D A Rice
Quadriceps weakness is a notable problem following knee damage. Research has shown effectiveness of TENS in improving Quadriceps weakness associated with arthrogenic muscle inhibition. However, these studies were not focused upon short term delivery of TENS, nor did they examine the potential mechanism(s). The present study examined the effect of 25-30 s of TENS upon weakness induced temporarily by a prolonged vibration. Subjects performed eccentric MVCs under 2 conditions (TENS and no-TENS). First, MVC was measured at baseline...
February 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28182797/can-real-time-visual-feedback-during-gait-retraining-reduce-metabolic-demand-for-individuals-with-transtibial-amputation
#8
Elizabeth Russell Esposito, Harmony S Choi, Benjamin J Darter, Jason M Wilken
The metabolic demand of walking generally increases following lower extremity amputation. This study used real-time visual feedback to modify biomechanical factors linked to an elevated metabolic demand of walking in individuals with transtibial amputation. Eight persons with unilateral, traumatic transtibial amputation and 8 uninjured controls participated. Two separate bouts of real-time visual feedback were provided during a single session of gait retraining to reduce 1) center of mass sway and 2) thigh muscle activation magnitudes and duration...
2017: PloS One
https://www.readbyqxmd.com/read/28174462/activation-of-back-and-lower-limb-muscles-during-squat-exercises-with-different-trunk-flexion
#9
Tae-Sik Lee, Min-Young Song, Yu-Jeong Kwon
[Purpose] The purpose of this study was to investigate the activation of back and lower limb muscles in subjects who were performing a squat exercise at different angles of trunk flexion. [Subjects and Methods] Twenty healthy subjects (age 21.1± 1.8 years, height 168.7 ± 8.2 cm, weight 66.1 ± 12.3 kg) volunteered. The activation of the erector spinae muscle, rectus femoris muscle, gluteus maximus muscle and biceps femoris muscle was observed while the subjects performed squat exercises with a trunk flexion of 0°, 15°, and 30°...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28174444/does-the-q-h-index-show-a-stronger-relationship-than-the-h-q-ratio-in-regard-to-knee-pain-during-daily-activities-in-patients-with-knee-osteoarthritis
#10
Remi Fujita, Yasumoto Matsui, Atsushi Harada, Marie Takemura, Izumi Kondo, Tetsuya Nemoto, Tadahiro Sakai, Hideki Hiraiwa, Susumu Ota
[Purpose] The purpose of this study was to elucidate the relationship between knee muscle strength and knee pain in activities of daily living, based on consideration of the difference between extension and flexion strength (Q - H) and the hamstring:quadriceps (H:Q) ratio in patients with knee osteoarthritis. [Subjects and Methods] The participants were 78 females with knee osteoarthritis, and a total of 133 knees that had not been treated surgically were the targets of this research. The legs were divided according to dominance...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28160657/patellar-tendon-straps-decrease-pre-landing-quadriceps-activation-in-males-with-patellar-tendinopathy
#11
Adam B Rosen, Jupil Ko, Kathy J Simpson, Cathleen N Brown
OBJECTIVE: To determine if patellar tendon straps altered quadriceps' muscle activity during a drop-jump landing in males with and without patellar tendinopathy. DESIGN: Case-control. SETTINGS: Biomechanics Research Laboratory. PARTICIPANTS: Twenty recreationally-active males participated: ten (age = 21.3 ± 2.4 years, height = 182.8 ± 5.3 cm, mass = 81.7 ± 8.6 kg) with patellar tendinopathy; ten (age = 22...
September 13, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28160084/neuromuscular-adaptations-to-sprint-interval-training-and-the-effect-of-mammalian-omega-3-fatty-acid-supplementation
#12
Evan J H Lewis, Frédéric Stucky, Peter W Radonic, Adam H Metherel, Thomas M S Wolever, Greg D Wells
PURPOSE: Sprint interval training (SIT) stimulates rapid metabolic adaptations within skeletal muscle but the nature of neuromuscular adaptions is unknown. Omega-3 polyunsaturated fatty acids (N-3 PUFA) are suggested to enhance neuromuscular adaptations to exercise. METHODS: We measured the neuromuscular adaptations to SIT (Study-1) and conducted a placebo-controlled randomized double blinded study to determine the effect of N-3 PUFA supplementation on neuromuscular adaptations to SIT (Study-2)...
February 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28146393/medial-patellofemoral-ligament-reconstruction-combined-with-distal-realignment-for-recurrent-dislocations-of-the-patella
#13
Iswadi Damasena, Murray Blythe, David Wysocki, David Kelly, Peter Annear
BACKGROUND: Tibial tubercle transfer (TTT) and medial patellofemoral ligament (MPFL) reconstruction have both shown, either in isolation or in combination, to provide improved patellofemoral joint (PFJ) stability. There are few studies that provide evidence that this remains true in the long term. PURPOSE: To compare the long-term results of patellar instability after TTT with and without MPFL reconstruction in 2 randomized groups. STUDY DESIGN: Randomized controlled trial; Level of evidence, 1...
February 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28144695/greater-intracortical-inhibition-associates-with-lower-quadriceps-voluntary-activation-in-individuals-with-acl-reconstruction
#14
Brittney A Luc-Harkey, Matthew S Harkey, Derek N Pamukoff, Rebecca H Kim, Troy K Royal, J Troy Blackburn, Jeffery T Spang, Brian Pietrosimone
Decreased voluntary activation contributes to quadriceps weakness following anterior cruciate ligament reconstruction (ACLR). Alterations in neural excitability are likely responsible for reductions in quadriceps voluntary activation, and may be due to specific alterations in intracortical inhibition and facilitation. Therefore, we sought to determine if intracortical inhibition (SICI) and intracortical facilitation (ICF) associate with quadriceps voluntary activation in individuals with ACLR. Twenty-seven participants with a primary, unilateral ACLR were enrolled in this study...
January 31, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28142073/attentional-focusing-instructions-influence-quadriceps-activity-characteristics-but-not-force-production-during-isokinetic-knee-extensions
#15
David C Marchant, Matt Greig
The attentional focus emphasised in verbal instruction influences movement and muscle recruitment characteristics, with an external focus (onto movement effects) typically benefiting performance. However, contrasting findings suggest either a selective isolation or spreading activation effect on associated muscles as a result of internally focused instruction (movement characteristics). In the present experiment, participants completed maximal isokinetic concentric leg extension exercise using internally (muscle specific: vastus medialis oblique) or externally (outcome specific) focused instructions...
January 27, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28138766/-evidence-based-therapy-for-tendinopathy-of-the-knee-joint-which-forms-of-therapy-are-scientifically-proven
#16
H Horstmann, J D Clausen, C Krettek, T S Weber-Spickschen
Tendinopathy in the region of the knee joint is a common pathological disorder. People active in sports, in particular, have a high probability of suffering from tendinopathy. Despite its high clinical relevance, the level of evidence of therapy options for tendinopathy in the knee region differs greatly. This review gives an overview of current evidence levels for therapy options in tendinopathy of the quadriceps, patellar and pes anserinus insertion tendons as well as of the distal iliotibial tract tendon...
January 30, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28130844/effect-of-aging-on-hypoxic-exercise-cardiorespiratory-and-muscle-and-cerebral-oxygenation-responses-in-healthy-humans
#17
Lara Puthon, Pierre Bouzat, Paul Robach, Anne Favre-Juvin, Stéphane Doutreleau, Samuel Verges
This study assessed the effects of aging on cardiorespiratory and tissue oxygenation responses to hypoxia both at rest and during incremental maximal exercise. Sixteen young (20 - 30 years) and 15older (60 - 70 years) healthy subjects performed two maximal incremental cycling tests in normoxia and hypoxia (inspiratory oxygen fraction: 12%). Cardiorespiratory responses, prefrontal cortex and quadriceps tissue oxygenation (near infrared spectroscopy) were measured during exercise as well as during hypercapnia at rest...
January 28, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28130080/fatigability-in-patients-with-multiple-sclerosis-during-maximal-concentric-contractions
#18
Sophie Hameau, Djamel Bensmail, Nicolas Roche, Raphael Zory
OBJECTIVE: To compare quadriceps fatigability during maximal concentric contractions in persons with MS and healthy subjects (HS). DESIGN: Observational study. SETTING: Hospital rehabilitation department PARTICIPANTS: Thirty eight persons with MS and fourteen HS were included. Torque of the knee flexor and extensor muscles and fatigability of the knee extensor muscles were evaluated using an isokinetic device. Surface electromyographic activity of rectus femoris, vastus lateralis, biceps femoris, and semi tendinosus was recorded...
January 24, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28129279/myoeletric-activity-of-the-quadriceps-during-leg-press-exercise-performed-with-differing-techniques
#19
Wallace Machado, Gabriel Paz, Leonardo Mendes, Marianna Maia, Jason B Winchester, Vicente Lima, Jeffrey M Willardson, Humberto Miranda
Machado, W, Paz, G, Mendes, L, Maia, M, Winchester, JB, Lima, V, Willardson, JM, and Miranda, H. Myoeletric activity of the quadriceps during leg press exercise performed with differing techniques. J Strength Cond Res 31(2): 422-429, 2017-The quadriceps muscle supplies the motive force for dynamic knee extension. During this action, the vastus medialis oblique (VMO) and vastus lateralis (VL) co-contract to stabilize the patella as it tracks within the patellofemoral groove. The purpose of this study was to analyze surface electromyographic (SEMG) responses for the VL, VMO, rectus femoris (RF), and biceps femoris (BF), as well as the VMO:VL ratio during an open-kinetic chain 45° angled leg press (LP45)...
February 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28126423/effects-of-kinesio-taping-in-patients-with-quadriceps-inhibition-a-randomized-single-blinded-study
#20
Kyung-Min Kim, Brandon Davis, Jay Hertel, Joseph Hart
OBJECTIVE: To determine effects of Kinesio taping (KT) on quadriceps activation and maximal voluntary isometric contraction (MVIC) in patients with quadriceps inhibition. DESIGN: Randomized, single-blinded. SETTING: Laboratory. PATIENTS: Sixteen participants (9 males, 7 females) with quadriceps inhibition, as determined by 90% or lower in central activation ratio (CAR), participated. MAIN OUTCOME MEASURES: Hoffmann reflex (H-reflex) of the vastus medialis and quadriceps CAR and MVIC were measured before taping, and participants were randomly allocated to either KT (KT application with tension) or sham (non-elastic tape application without tension) group...
September 1, 2016: Physical Therapy in Sport
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