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https://www.readbyqxmd.com/read/28603377/effect-of-prolonged-racing-on-muscle-activity-and-spatiotemporal-variables-double-poling-technique
#1
Kitae Kim, Siddhartha Bikram Panday, In-Sik Shin, Jin-Hae Kim, Hye-Young Kim, Gwang-Jae Yu
[Purpose] The purpose of this study was to examine the effect of a 40-minute race on muscle activity and spatiotemporal cycle variables at four-time points during a 12-km roller skiing test using the double-poling technique. [Subjects and Methods] Five elite cross-country (XC) skiers on the Korean National reserve team participated in the study. Part of a biathlon course that consisted of both flat land and slopes was selected, and three measurements were recorded after every 4-km lap. Spatiotemporal variables, mean frequency and mean amplitude of 6 muscles were the chosen computational parameters...
May 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28601553/skeletal-muscle-water-t2-as-a-biomarker-of-disease-status-and-exercise-effects-in-patients-with-duchenne-muscular-dystrophy
#2
Ami Mankodi, Noura Azzabou, Thomas Bulea, Harmen Reyngoudt, Hirity Shimellis, Yupeng Ren, Eunhee Kim, Kenneth H Fischbeck, Pierre G Carlier
The purpose of this study was to examine exercise effects on muscle water T2 in patients with Duchenne muscular dystrophy (DMD). In 12 DMD subjects and 19 controls, lower leg muscle fat (%) was measured by Dixon and muscle water T2 and R2 (1/T2) by the tri-exponential model. Muscle water R2 was measured again at 3 hours after an ankle dorsiflexion exercise. The muscle fat fraction was higher in DMD participants than in controls (p < .001) except in the tibialis posterior muscle. Muscle water T2 was measured independent of the degree of fatty degeneration in DMD muscle...
April 28, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28585766/one-minute-plantar-flexors-static-stretch-transiently-increases-h-reflex-excitability-and-exerts-no-effect-on-corticospinal-pathways
#3
Francesco Budini, Eugen Gallasch, Monica Christova, Dietmar Rafolt, Andreas Benedikt Rauscher, Tilp Markus
The purpose of this study was to determine whether the neural responses observed following static stretching are mediated by muscle spindles sensitivity, spinal excitability or cortical excitability and how long these influences last. Nineteen volunteers (25.7 ± 5.6 years) were tested for tap reflex (T-reflex), H-reflex and motor evoked potentials (MEPs) on ankle flexors and extensors at immediately, five and ten minutes after one minute static stretching applied at individual maximal ankle dorsiflexion, as well as immediately, five and ten minutes after a control period of same duration...
June 6, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28580246/endoscopic-resection-of-giant-cell-tumor-of-the-extensor-tendon-of-the-foot
#4
Tun Hing Lui
The localized form of giant cell tumor of the tendon sheath is one of the most common soft tissue tumors of the foot and ankle region. It is characteristically a benign, sharply localized peritendinous fibrous mass in the synovial or tendinous spaces. The purpose of this Technical Note is to present the technical details of endoscopic resection of giant cell tumor of the extensor tendon of the foot with preservation of the tendon. It is indicated in the localized form of giant cell tumor of the extensor tendon at the foot dorsum...
April 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28574860/crouch-gait-can-be-an-effective-form-of-forced-use-no-constraint-exercise-for-the-paretic-lower-limb-in-stroke
#5
Luigi Tesio, Viviana Rota, Chiara Malloggi, Luigia Brugliera, Luigi Catino
In hemiplegic gait the paretic lower limb provides less muscle power and shows a briefer stance compared with the unaffected limb. Yet, a longer stance and a higher power can be obtained from the paretic lower limb if gait speed is increased. This supports the existence of a 'learned non-use' phenomenon, similar to that underlying some asymmetric impairments of the motion of the eyes and of the upper limbs. Crouch gait (CG) (bent-hip bent-knee, about 30° minimum knee flexion) might be an effective form of 'forced-use' treatment of the paretic lower limb...
June 1, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28574410/changes-in-muscle-cross-sectional-area-muscle-force-and-jump-performance-during-6-weeks-of-progressive-whole-body-vibration-combined-with-progressive-high-intensity-resistance-training
#6
A Rosenberger, Å Beijer, B Johannes, E Schoenau, J Mester, J Rittweger, J Zange
OBJECTIVES: We hypothesized that progressive whole-body vibration (WBV) superimposed to progressive high intensity resistance training has greater effects on muscle cross-sectional area (CSA), muscle force of leg muscles, and jump performance than progressive high intensity resistance training alone. METHODS: Two groups of healthy male subjects performed either 6 weeks of Resistive Vibration Exercise (RVE, squats and heel raises with WBV, n=13) or Resistive Exercise (RE, squats and heel raises without WBV, n=13)...
June 1, 2017: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/28528818/patellar-tendon-vibration-reduces-the-increased-facilitation-from-quadriceps-to-soleus-in-post-stroke-hemiparetic-individuals
#7
Eric Maupas, Joseph-Omer Dyer, Sibele de Andrade Melo, Robert Forget
BACKGROUND: Stimulation of the femoral nerve in healthy people can facilitate soleus H-reflex and electromyography (EMG) activity. In stroke patients, such facilitation of transmission in spinal pathways linking the quadriceps and soleus muscles is enhanced and related to co-activation of knee and ankle extensors while sitting and walking. Soleus H-reflex facilitation can be depressed by vibration of the quadriceps in healthy people, but the effects of such vibration have never been studied on the abnormal soleus facilitation observed in people after stroke...
May 18, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28499159/sensitivity-of-biomechanical-outcomes-to-independent-variations-of-hindfoot-and-forefoot-stiffness-in-foot-prostheses
#8
Peter Gabriel Adamczyk, Michelle Roland, Michael E Hahn
Many studies have reported the effects of different foot prostheses on gait, but most results cannot be generalized because the prostheses' properties are seldom reported. We varied hindfoot and forefoot stiffness in an experimental foot prosthesis, in increments of 15N/mm, and tested the parametric effects of these variations on treadmill walking in unilateral transtibial amputees, at speeds from 0.7 to 1.5m/s. We computed outcomes such as prosthesis energy return, center of mass (COM) mechanics, ground reaction forces, and joint mechanics, and computed their sensitivity to component stiffness...
May 9, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28466759/knee-ankle-foot-orthosis-with-powered-knee-for-support-in-the-elderly
#9
Peter Paul Pott, Sebastian Immanuel Wolf, Julia Block, Stefan van Drongelen, Markus Grün, Daniel Ww Heitzmann, Jürgen Hielscher, Andreas Horn, Roman Müller, Oliver Rettig, Ulrich Konigorski, Roland Werthschützky, Helmut Friedrich Schlaak, Thorsten Meiß
A prototype of a powered knee orthotic device was developed to determine whether fractional external torque and power support to the knee relieves the biomechanical loads and reduces the muscular demand for a subject performing sit-to-stand movements. With this demonstrator, consisting of the subsystems actuation, kinematics, sensors, and control, all relevant sensor data can be acquired and full control is maintained over actuator parameters. A series-elastic actuator based on a direct current motor provides up to 30 Nm torque to the knee via a hinge joint with an additional sliding degree of freedom...
May 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28465222/impacts-of-muscle-strength-and-balance-control-on-sit-to-walk-and-turn-durations-in-the-timed-up-and-go-test
#10
Tzurei Betty Chen, Li-Shan Chou
OBJECTIVE: To examine the association of muscle strength and balance control with the amount of time taken to perform sit-to-walk (STW) or turning components of Timed Up and Go test (TUG) in elderly adults DESIGN: Correlations; multiple regression models. SETTING: General community. PARTICIPANTS: Sixty elderly adults over the age of 70 years recruited from the community. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE(S): Muscle strength, balance control and TUG performance time...
April 29, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28444097/chronic-polyarthritis-as-the-first-manifestation-of-childhood-systemic-polyarteritis-nodosa
#11
Glaucia Vanessa Novak, Koken Hayashi, Kohei Sampa, Yosuke Okumura, Gabriela Ribeiro Viola Ferreira, Clovis Artur Silva
Arthritis has been reported as an acute pattern, generally evanescent with oligoarthritis, mostly affecting knees and ankles in childhood systemic polyarteritis nodosa. However, chronic polyarthritis with morning stiffness mimicking juvenile idiopathic arthritis has not been reported. We describe the case of a 4-year old girl who had additive and chronic polyarthritis with edema, tenderness, pain on motion and morning stiffness for 2 months. After 45 days, she also presented painful subcutaneous nodules and erythematous-violaceous lesions in the extensor region of upper and lower limbs...
January 2017: Einstein
https://www.readbyqxmd.com/read/28432883/sagittal-plane-joint-kinetics-during-stair-ascent-in-patients-with-peripheral-arterial-disease-and-intermittent-claudication
#12
Stephanie L King, Natalie Vanicek, Thomas D O'Brien
Stair negotiation poses a substantial physical demand on the musculoskeletal system and this challenging task can place individuals at risk of falls. Peripheral arterial disease (PAD) can cause intermittent claudication (IC) pain in the calf and results in altered gait mechanics during level walking. However, whether those with PAD-IC adopt alternate strategies to climb stairs is unknown. Twelve participants with PAD-IC (six bilateral and six unilateral) and 10 healthy controls were recruited and instructed to ascend a five-step staircase whilst 3D kinematic data of the lower-limbs were recorded synchronously with kinetic data from force plates embedded into the staircase on steps two and three...
March 28, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28419877/effect-of-foot-orthoses-on-the-medial-longitudinal-arch-in-children-with-flexible-flatfoot-deformity-a-three-dimensional-moment-analysis
#13
Amir Ali Jafarnezhadgero, Morteza Madadi Shad, Mahdi Majlesi
Foot orthoses are often used to correct altered gait patterns. The purpose of this study was to investigate how foot orthoses can modify the magnitude of three dimensional moments of ankle, knee, and hip joints during a stride of gait in children with flexible flat feet. Bilateral gait data were collected from fourteen male children (age 10.2±1.4 years) suffering from flat feet syndrome. In order to obtain the kinematics data, a Vicon system with six cameras (100Hz) was used and two Kistler force plates (1000Hz) to record the kinetics data under each leg...
April 7, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28415899/specific-muscle-synergies-in-national-elite-female-ice-hockey-players-in-response-to-unexpected-external-perturbation
#14
Minhee Kim, Yushin Kim, Hyeyoung Kim, BumChul Yoon
This study aimed to investigate specific muscle synergies in elite ice hockey players indicating highly developed postural control strategies used to restore balance against unexpected external perturbations. Seven elite athletes (EA) on the women's national ice hockey team and 7 non-athletes (NA) participated in this study. Based on trajectories of centre of mass (COM), analysis periods were divided into an initial phase (a balance disturbance after perturbation onset) and a reversal phase (a balance recovery response), respectively...
April 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28392324/the-reliability-and-validity-of-the-timed-up-and-go-motor-test-for-people-with-chronic-stroke
#15
Peggy P K Chan, Joyce I F Si Tou, Mimi M Y Tse, Shamay S M Ng
OBJECTIVES: To examine: (1) the intra-rater, inter-rater and test-retest reliabilities of the timed up and go (motor) test (TUGmotor) in terms of the number of steps taken and completion time with a chronic stroke population; (2) the relationship between stroke-specific impairments and the number of steps taken in the test and the completion time; (3) the minimal detectable change in TUGmotor times; and (4) the cut-off time which best discriminates the performance of people with stroke from that of healthy older adults...
April 6, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28386144/self-healing-juvenile-cutaneous-mucinosis
#16
Beata Kołodziejczyk, Agnieszka Gazda, Elżbieta Hernik, Izabela Szczygielska, Lidia Rutkowska-Sak, Marta Legatowicz Koprowska
Girl, aged 4 years old, began the disease with pain of the lower extremities, fever up to 38°C and signs of upper airway infection. Then the patient developed oedema and redness of the whole face, thickened skin, subcutaneous nodular foldings of the frontal, occipital, cervical and axillary regions, extensor areas of the joints; fine, hard whitish nodules in the frontal region and over interphalangeal joints of the hands, pruritus; oedemas of the ankles, knees and joints of the hands, cervical lymphadenopathy and hepatomegaly...
2017: Reumatologia
https://www.readbyqxmd.com/read/28377110/association-of-neuromuscular-attributes-with-performance-based-mobility-among-community-dwelling-older-adults-with-symptomatic-lumbar-spinal-stenosis
#17
Catherine T Schmidt, Rachel E Ward, Pradeep Suri, Dan K Kiely, Pengsheng Ni, Dennis E Anderson, Jonathan F Bean
OBJECTIVES: To identify differences in health factors, neuromuscular attributes, and performance-based mobility among community-dwelling older adults with symptomatic lumbar spinal stenosis; and to determine which neuromuscular attributes are associated with performance-based measures of mobility. DESIGN: Cross-sectional; secondary data analysis of a cohort study. SETTING: Outpatient rehabilitation center. PARTICIPANTS: Community-dwelling adults aged ≥65 years with self-reported mobility limitations and symptomatic lumbar spinal stenosis (N=54)...
April 2, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28350716/movement-strategies-among-groups-of-chronic-ankle-instability-coper-and-control
#18
S Jun Son, Hyunsoo Kim, Mattew K Seeley, J Ty Hopkins
INTRODUCTION: Comprehensive evaluation of movement strategies during functional movement is a difficult undertaking. Because of this challenge, studied movements have been over simplified. Furthermore, evaluating movement strategies at only a discrete time point(s) provide limited insight into how movement strategies may change or adapt in chronic ankle instability (CAI) patients. This study aimed to identify abnormal movement strategies in individuals with a history of ankle sprain injury during a sports maneuver compared to healthy controls...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28348929/curvature-reduces-bending-strains-in-the-quokka-femur
#19
Kyle McCabe, Keith Henderson, Jess Pantinople, Hazel L Richards, Nick Milne
This study explores how curvature in the quokka femur may help to reduce bending strain during locomotion. The quokka is a small wallaby, but the curvature of the femur and the muscles active during stance phase are similar to most quadrupedal mammals. Our hypothesis is that the action of hip extensor and ankle plantarflexor muscles during stance phase place cranial bending strains that act to reduce the caudal curvature of the femur. Knee extensors and biarticular muscles that span the femur longitudinally create caudal bending strains in the caudally curved (concave caudal side) bone...
2017: PeerJ
https://www.readbyqxmd.com/read/28338388/preferred-hip-strategy-during-landing-reduces-knee-abduction-moment-in-collegiate-female-soccer-players
#20
Anh-Dung Nguyen, Jeffrey B Taylor, Taylor G Wimbish, Jennifer L Keith, Kevin R Ford
CONTEXT: Hip focused interventions are aimed to decrease frontal plane knee loading related to anterior cruciate ligament (ACL) injuries. Whether a preferred hip landing strategy decreases frontal plane knee loading is unknown. OBJECTIVE: To determine if a preferred hip landing strategy during a drop vertical jump (DVJ) is utilized during a single leg landing (SLL) task and whether differences in frontal plane knee loading are consistent between a DVJ and a SLL task...
March 24, 2017: Journal of Sport Rehabilitation
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