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https://www.readbyqxmd.com/read/28718344/knee-extensor-fatigue-developed-during-high-intensity-exercise-limits-lower-limb-power-production
#1
Steven J O'bryan, François Billaut, Janet L Taylor, David M Rouffet
We investigated the association between changes in vastii electromyography (EMG) and knee extensor fatigue during high-intensity cycling, and the subsequent effect on lower-limb power and intermuscular coordination during all-out cycling. On two separate days, participants completed 30-s all-out cycling or 10-min of high-intensity cycling followed by 30-s all-out cycling. EMG for gluteus maximus (GMAX), rectus femoris (RF), vastii (VAS), hamstrings (HAM) and gastrocnemius (GAS); co-activation for GMAX/RF, VAS/HAM and VAS/GAS; isometric maximal voluntary force (IMVF) and resting twitch (RT) of the knee extensors were measured...
July 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28718320/oral-prednisolone-for-4-days-does-not-increase-exercise-tolerance-in-men-with-copd
#2
S L Karlsson, V Backer, Nina Skavlan Godtfredsen
One of the primary objectives in management of chronic obstructive pulmonary disease (COPD) is preventing decrease in lung function and reducing the annual number of acute exacerbations of COPD (AECOPD). An oral course of systemic corticosteroids is a commonly used treatment in AECOPD. We hypothesize that this treatment also increases exercise performance and decreases muscle fatigue. In a randomized double-blinded, parallel, placebo-controlled trial, we investigated 14 men (8 on prednisolone 37.5 mg vs. 6 on placebo) with severe and very severe COPD...
January 1, 2017: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/28717888/acetabular-labral-reconstruction-using-the-indirect-head-of-the-rectus-femoris-tendon-significantly-improves-patient-reported-outcomes
#3
Eyal Amar, Thomas G Sampson, Zachary T Sharfman, Alyssa Caplan, Noa Rippel, Ran Atzmon, Michael Drexler, Ehud Rath
PURPOSE AND HYPOTHESIS: The aim of this study was to evaluate outcomes after acetabular labral reconstruction using the indirect head of the rectus femoris tendon. The study hypothesis stated that arthroscopic acetabular labral reconstruction may improve patient reported outcomes in patients with labral tears that were not amenable to repair. METHODS: Between 2009 and 2015, the senior author performed 31 acetabular labral reconstructions using the indirect head of the rectus femoris tendon...
July 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28717097/plasma-2-hydroxyglutarate-and-hexanoylcarnitine-levels-are-potential-biomarkers-for-skeletal-muscle-toxicity-in-male-fischer-344-rats
#4
Hisakuni Obayashi, Naoko Kobayashi, Yoshikazu Nezu, Takashi Yamoto, Mitsuyuki Shirai, Fumitoshi Asai
To identify new candidate biomarkers for skeletal muscle toxicity, an unbiased metabolomic analysis was performed in rats treated with two distinct myotoxicants, cerivastatin (CER) and tetramethyl-p-phenylenediamine (TMPD). Skeletal muscle toxicity was induced in male Fischer 344 rats by administering CER or TMPD and monitored using established endpoints, such as increased plasma creatine kinase (CK) activity and histopathology, and a metabolomic analysis of skeletal muscle and plasma samples. Plasma CK levels in CER-treated rats were markedly elevated at Day 11; however, those in TMPD-treated rats showed a statistically significant decrease at 24 hr after dosing...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28708068/mechanomyography-and-torque-during-fes-evoked-muscle-contractions-to-fatigue-in-individuals-with-spinal-cord-injury
#5
Nor Zainah Mohamad, Nur Azah Hamzaid, Glen M Davis, Ahmad Khairi Abdul Wahab, Nazirah Hasnan
A mechanomyography muscle contraction (MC) sensor, affixed to the skin surface, was used to quantify muscle tension during repetitive functional electrical stimulation (FES)-evoked isometric rectus femoris contractions to fatigue in individuals with spinal cord injury (SCI). Nine persons with motor complete SCI were seated on a commercial muscle dynamometer that quantified peak torque and average torque outputs, while measurements from the MC sensor were simultaneously recorded. MC-sensor-predicted measures of dynamometer torques, including the signal peak (SP) and signal average (SA), were highly associated with isometric knee extension peak torque (SP: r = 0...
July 14, 2017: Sensors
https://www.readbyqxmd.com/read/28705170/can-lokomat-therapy-with-children-and-adolescents-be-improved-an-adaptive-clinical-pilot-trial-comparing-guidance-force-path-control-and-freed
#6
Tabea Aurich-Schuler, Fabienne Grob, Hubertus J A van Hedel, Rob Labruyère
BACKGROUND: Robot-assisted gait therapy is increasingly being used in pediatric neurorehabilitation to complement conventional physical therapy. The robotic device applied in this study, the Lokomat (Hocoma AG, Switzerland), uses a position control mode (Guidance Force), where exact positions of the knee and hip joints throughout the gait cycle are stipulated. Such a mode has two disadvantages: Movement variability is restricted, and patients tend to walk passively. Kinematic variability and active participation, however, are crucial for motor learning...
July 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28704193/rehabilitation-of-patients-with-hip-joint-arthroplasty-late-post-surgery-period-hospital-rehabilitation
#7
Maya S Krastanova, Elena M Ilieva, Danelina E Vacheva
BACKGROUND: Hip joint replacement (endoprosthesis, alloplasty) has become one of the most frequent surgery interventions of the 20th century. AIM: To conduct rehabilitation therapy in the late post-surgery period of hospital rehabilitation (45 days after surgery), to track patients' progress and measure the results. MATERIALS AND METHODS: One hundred and fifty-two patients with hip joint endoprosthesis were included in the study. All underwent surgery and rehabilitation at the Department of Clinical Rehabilitation of the Physical and Rehabilitation Medicine Clinic at Doctor G...
June 1, 2017: Folia Medica
https://www.readbyqxmd.com/read/28702442/kinematics-and-neuromuscular-recruitment-during-vertical-treadmill-exercise
#8
Alastair R Jordan, Andrew Barnes, David Claxton, Alison Purvis, Mary Fysh
The vertical treadmill (VertiRun) is an unresearched, partial weight-bearing exercise mode for lower limb rehabilitation. The user undertakes a "running-like" action whilst body weight is supported by a bench and the limb is drawn downwards against overhanging resistance cables on a vertically hung nonmotorised treadmill. This study sought to describe the kinematics and neuromuscular recruitment during VertiRun exercise in the supine, 40°, and 70° postures. Twenty-one healthy male participants (age, 25±7 years; stature, 1...
June 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28700356/a-novel-anionic-phosphate-platinum-complex-effectively-targets-an-undifferentiated-pleomorphic-sarcoma-better-than-cisplatinum-and-doxorubicin-in-a-patient-derived-orthotopic-xenograft-pdox
#9
Kentaro Igarashi, Kei Kawaguchi, Takashi Murakami, Tasuku Kiyuna, Kentaro Miyake, Norio Yamamoto, Katsuhiro Hayashi, Hiroaki Kimura, Scott D Nelson, Sarah M Dry, Yunfeng Li, Arun S Singh, Shinji Miwa, Akira Odani, Fritz C Eilber, Hiroyuki Tsuchiya, Robert M Hoffman
A patient high-grade undifferentiated pleomorphic soft-tissue sarcoma (UPS) from a striated muscle was previously orthotopically implanted in the right biceps femoris muscle of nude mice to establish a patient-derived orthotopic xenograft (PDOX) nude-mouse model. In the present study, two weeks after orthotopic transplantation of the UPS, mice were treated intraperitoneally with cisplatinum (CDDP), doxorubicin (DOX) or a novel anionic-phosphate-platinum compound 3Pt. Treatments were repeated weekly for a total of 3 times...
June 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28697691/the-relationship-between-mechanical-stiffness-and-athletic-performance-markers-in-sub-elite-footballers
#10
Judd T Kalkhoven, Mark L Watsford
This study investigated the relationship between several measures of lower-body stiffness and physical performance variables in 22 sub-elite male football players (mean ± SD; 21.9 ± 1.5 yr; 1.79 ± 0.06 m; 72.2 ± 7.2 kg). The participants were assessed for individual muscle stiffness of the Rectus Femoris (RF), Biceps Femoris (BF) and Medial Gastrocnemius (MG) muscles and vertical stiffness (Kvert) was also assessed assessed running acceleration, maximal sprint speed, agility, vertical jumping and muscular strength...
July 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28697399/patellar-bracing-affects-semg-activity-of-leg-and-thigh-muscles-during-stance-phase-in-patellofemoral-pain-syndrome
#11
Fatemeh Salarie Sker, Mehrdad Anbarian, Amir H Yazdani, Pouria Hesari, Arash Babaei-Ghazani
BACKGROUND: Decreases in patellofemoral pain symptoms with bracing treatment have been established; but, the mechanisms remain unclear. The purpose of this study was to determine the immediate and long-term effects of the patellar bracing on electromyography (EMG) activity of the Vastus Medialis (VM) and Lateralis (VL), Rectus Femoris, lateral Gastrocnemius, Biceps Femoris and Semitendinosus (ST) muscles during level walking. METHODS: 12 eligible women aged 20-30 years with diagnosis of patellofemoral pain participated in the before and after study...
June 29, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28688293/a-new-parameter-for-quantifying-the-variability-of-surface-electromyographic-signals-during-gait-the-occurrence-frequency
#12
Francesco Di Nardo, Alessandro Mengarelli, Annachiara Strazza, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti
Natural variability of myoelectric activity during walking was recently analyzed considering hundreds of strides. This allowed assessing a parameter seldom considered in classic surface EMG (sEMG) studies: the occurrence frequency, defined as the frequency each muscle activation occurs with, quantified by the number of strides when a muscle is recruited with that specific activation modality. Aim of present study was to propose the occurrence frequency as a new parameter for assessing sEMG-signal variability during walking...
June 30, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28687961/allogeneic-adipose-derived-mesenchymal-stem-cell-transplantation-enhances-the-expression-of-angiogenic-factors-in-a-mouse-acute-hindlimb-ischemic-model
#13
Ngoc Bich Vu, Ha Thi-Ngan Le, Thuy Thi-Thanh Dao, Lan Thi Phi, Ngoc Kim Phan, Van Thanh Ta
Cell migration and molecular mechanisms during healing of damaged vascular or muscle tissues are emerging fields of interest worldwide. The study herein focuses on evaluating the role of allogenic adipose-derived mesenchymal stem cells (ADMSCs) in restoring damaged tissues. Using a hindlimb ischemic mouse model, ADMSC-mediated induction of cell migration and gene expression related to myocyte regeneration and angiogenesis were evaluated. ADMSCs were labeled with GFP (ADMSC-GFP). The proximal end of the femoral blood vessel of mice (over 6 months of age) are ligated at two positions then cut between the two ties...
July 8, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28687301/reproducibility-of-ultrasound-derived-muscle-thickness-and-echo-intensity-for-the-entire-quadriceps-femoris-muscle
#14
R Santos, P A S Armada-da-Silva
INTRODUCTION: Muscle thickness (MT) and muscle echo-intensity (EI) allow the study of skeletal muscle adaptive changes with ultrasound. This study investigates the intra- and inter-session reliability and agreement of MT and EI measurements for each of the four heads of the quadriceps femoris in transverse and longitudinal scans, using two sizes for the region of interest (ROI); EI measurements only. METHODS: Three B-mode images from two views were acquired from each head of quadriceps femoris from twenty participants (10 females) in two sessions, 7 days apart...
August 2017: Radiography
https://www.readbyqxmd.com/read/28685425/multi-site-measurements-of-muscle-o2-dynamics-during-cycling-exercise-in-early-post-myocardial-infarction
#15
Shun Takagi, Ryotaro Kime, Norio Murase, Masatsugu Niwayama, Takuya Osada, Toshihito Katsumura
The aim of this study was to compare the muscle oxygen dynamics between early post-myocardial infarction (n = 12; MI) and age-matched elderly subjects without MI (n = 12; CON) in several leg muscles during ramp cycling exercise. Muscle oxygen saturation (SmO2), deoxygenated-hemoglobin concentration (∆deoxy-Hb), and total-hemoglobin concentration (∆total-Hb) were monitored continuously at the distal site of vastus lateralis (VLd), proximal site of the vastus lateralis (VLp), rectus femoris (RF), vastus medialis (VM), gastrocnemius medialis (GM), and tibialis anterior (TA) muscles by near infrared spatial resolved spectroscopy...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28682936/effects-of-wearing-a-compression-garment-during-night-sleep-on-recovery-from-high-intensity-eccentric-concentric-quadriceps-muscle-fatigue
#16
Yohei Shimokochi, Satoshi Kuwano, Taichi Yamaguchi, Hiroyuki Abutani, Norihiro Shima
This study aimed to investigate the effects of wearing a compression garment (CG) during night sleep on muscle fatigue recovery after high-intensity eccentric and concentric knee extensor exercises. Seventeen college male students participated in two experimental sessions under CG and non-CG (NCG) wearing conditions. Before night sleep under CG or NCG wearing conditions, the subjects performed a fatiguing protocol consisting of 10 sets of 10 repetitions of maximal isokinetic eccentric and concentric knee extensor contractions, with 30-second rest intervals between the sets...
July 3, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28682935/muscle-activity-and-physiological-responses-during-running-in-water-and-on-dry-land-at-submaximal-and-maximal-efforts
#17
Kenji Masumoto, Kyle C Mefferd, Riley Iyo, John A Mercer
We investigated muscle activity, oxygen uptake, heart rate, and rating of perceived exertion during running in water and on dry land at submaximal and maximal efforts. Eleven recreational runners performed deep water running (DWR) and treadmill running (TMR) graded exercise tests on separate days. On the third test day, the participants exercised at their 60%, 80%, and 100% of maximal oxygen uptake (VO2max) by matching specific stride frequencies or running speeds. VO2max, maximal heart rate (HRmax), and rating of perceived exertion at maximal effort (RPEmax) were measured...
July 3, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28678768/effects-of-lower-limb-strength-training-on-agility-repeated-sprinting-with-changes-of-direction-leg-peak-power-and-neuromuscular-adaptations-of-soccer-players
#18
Mehréz Hammami, Yassine Negra, François Billaut, Souhail Hermassi, Roy J Shephard, Mohamed Souhaiel Chelly
We examined the effects on explosive muscular performance of incorporating 8 weeks strength training into the preparation of junior male soccer players, allocating subjects between an experimental group (E, n=19) and a matched control group (C, n=12). Controls maintained their regular training program, but the experimental group replaced a part of this schedule by strength training. Performance was assessed using running times (5m, 10m, 20m, 30 and 40m), a sprint test with 180° turns (S180°), a 9-3-6-3-9 m sprint with backward and forward running (SBF), a 4 x 5 m sprint test with turns, repeated shuttle sprinting, repeated changes of direction, squat (SJ) and counter-movement (CMJ) jumping, back half-squatting, and a force-velocity test...
January 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28674922/effects-of-training-programs-based-on-ipsilateral-voluntary-and-stimulated-contractions-on-muscle-strength-and-monopedal-postural-control-of-the-contralateral-limb
#19
Mohamed Abdelhafid Kadri, Frederic Noé, Merbouha Boulahbel Nouar, Thierry Paillard
PURPOSE: To compare the effects of unilateral strength training by stimulated and voluntary contractions on muscle strength and monopedal postural control of the contralateral limb. METHODS: 36 non-active healthy male subjects were recruited and split randomly into three groups. Two groups of 12 subjects took part in a strength-training program (3 sessions a week over 8 weeks) comprising 43 contractions of the quadriceps femoris of the ipsilateral limb (at 20% of the MVC)...
July 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28670284/tensiomyographic-markers-are-not-sensitive-for-monitoring-muscle-fatigue-in-elite-youth-athletes-a-pilot-study
#20
Thimo Wiewelhove, Christian Raeder, Rauno Alvaro de Paula Simola, Christoph Schneider, Alexander Döweling, Alexander Ferrauti
Objective: Tensiomyography (TMG) is an indirect measure of a muscle's contractile properties and has the potential as a technique for detecting exercise-induced skeletal muscle fatigue. Therefore, the aim of this study was to assess the sensitivity of tensiomyographic markers to identify reduced muscular performance in elite youth athletes. Methods: Fourteen male junior tennis players (age: 14.9 ± 1.2 years) with an international (International Tennis Federation) ranking position participated in this pre-post single group trial...
2017: Frontiers in Physiology
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