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https://www.readbyqxmd.com/read/28931547/the-plateau-in-the-nirs-derived-hhb-signal-near-the-end-of-a-ramp-incremental-test-does-not-indicate-the-upper-limit-of-o2-extraction-in-the-vastus-lateralis
#1
Erin Calaine Inglis, Danilo Iannetta, Juan M Murias
This study aimed to examine, at the level of the active muscles, whether the plateau in oxygen (O2) extraction normally observed near the end of a ramp incremental (RI) exercise test to exhaustion, is caused by the achievement of an upper limit in O2 extraction. 11 healthy men (27.3 ± 3.0 years; 81.6 ± 8.1 kg; 183.9 ± 6.3 cm) performed a RI cycling test to exhaustion. O2 extraction of the vastus lateralis (VL) was measured continuously throughout the test using the near-infrared spectroscopy (NIRS)-derived deoxygenated hemoglobin [HHb] signal...
September 20, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28931339/limb-girdle-muscular-dystrophy-type-2i-two-chinese-families-and-a-review-in-asian-patients
#2
Dan-Ni Wang, Zhi-Qiang Wang, Yu-Qing Chen, Guo-Rong Xu, Min-Ting Lin, Ning Wang
BACKGROUND: Limb-girdle muscular dystrophy type 2I (LGMD2I) is an autosomal recessive hereditary disorder caused by mutations in the fukutin-related protein (FKRP) gene. Although the features of the disorder in European patients have been summarized, Asian patients with LGMD2I have rarely been reported. Thus, the clinical differences in LGMD2I between Asian and European patients and the associated genetic changes remain unclear. METHODS: We reported detailed clinical data as well as results from muscle biopsy, muscle MRI and genetic analysis of the FKRP gene in two unrelated Chinese families with LGMD2I...
September 21, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28930862/an-innovative-ergometer-to-measure-neuromuscular-fatigue-immediately-after-cycling
#3
Douglas Doyle-Baker, John Temesi, Mary E Medysky, Robert J Holash, Guillaume Y Millet
PURPOSE: When assessing neuromuscular fatigue (NMF) from dynamic exercise using large muscle mass (e.g. cycling), most studies have delayed measurement for 1-3 min after task failure. This study aimed to determine the reliability of an innovative cycling ergometer permitting the start of fatigue measurement within 1 s after cycling. METHODS: Twelve subjects participated in two experimental sessions. Knee-extensor NMF was assessed by electrical nerve and transcranial magnetic stimulation with both a traditional chair set-up (PRE and POST-Chair, 2 min post-exercise) and the new cycling ergometer (PRE, every 3 min during incremental exercise and POST-Bike, at task failure)...
September 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28925163/-proteomics-research-of-intervention-effect-of-qi-enriching-herbs-on-qi-deficiency-rats-based-on-technology-of-nanolc-ltq-orbitrap
#4
Yin-Fang Chen, Ying-Jun Fu, Chao Liu, Min Hou, Guo-Liang Xu, Ri-Yue Yu, Hong-Ning Liu, Li-Ping Huang
Proteomics method, based on NanoLC-LTQ-Orbitrap technology, was applied to explore the biological basis of intervention effect of "Qi enriching" herbs on "Qi deficiency" rats. The "Qi deficiency" rat model was established with caloric restriction combined with excessive swimming. Muscle proteins of vastus lateralis from the blank group, the model group and the ginseng group were detected by NanoLC-LTQ-Orbitrap system. The data were imported into Protein Discovery software to identify the proteins and all the raw datum were analyzed by SIEVE software...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28918955/shifts-in-the-relationship-between-motor-unit-recruitment-thresholds-versus-derecruitment-thresholds-during-fatigue
#5
Matt S Stock, Jacob A Mota
Muscle fatigue is associated with diminished twitch force amplitude. We examined changes in the motor unit recruitment versus derecruitment threshold relationship during fatigue. Nine men (mean age = 26 years) performed repeated isometric contractions at 50% maximal voluntary contraction (MVC) knee extensor force until exhaustion. Surface electromyographic signals were detected from the vastus lateralis, and were decomposed into their constituent motor unit action potential trains. Motor unit recruitment and derecruitment thresholds and firing rates at recruitment and derecruitment were evaluated at the beginning, middle, and end of the protocol...
September 14, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28912660/effects-of-whole-body-vibration-on-the-neuromuscular-amplitude-of-vastus-lateralis-muscle
#6
Daniel T Borges, Liane B Macedo, Caio A A Lins, Catarina O Sousa, Jamilson S Brasileiro
The aim of this study was to investigate the effects of whole-body vibration (WBV) on vastus lateralis (VL) surface electromyographic (sEMG) amplitude during an isometric semi-squat exercise, using two different frequencies, and to verify the influence of additional filters on the analyzed sEMG signal's characteristics. Forty physically active women were randomly divided into two groups with 20 members each: one group performed an isometric semi-squat exercise at 30 Hz - while the other group performed the same exercise protocol at 50 Hz...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28912130/near-infrared-spectroscopy-of-superficial-and-deep-rectus-femoris-reveals-markedly-different-exercise-response-to-superficial-vastus-lateralis
#7
Shunsaku Koga, Dai Okushima, Thomas J Barstow, Harry B Rossiter, Narihiko Kondo, David C Poole
To date our knowledge of skeletal muscle deoxygenation as measured by near-infrared spectroscopy (NIRS) is predicated almost exclusively on sampling of superficial muscle(s), most commonly the vastus lateralis (VL-s). Recently developed high power NIRS facilitates simultaneous sampling of deep (i.e., rectus femoris, RF-d) and superficial muscles of RF (RF-s) and VL-s. Because deeper muscle is more oxidative with greater capillarity and sustains higher blood flows than superficial muscle, we used time-resolved NIRS to test the hypotheses that, following exercise onset, the RF-d has slower deoxy[Hb+Mb] kinetics with reduced amplitude than superficial muscles...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28902116/adding-whole-body-vibration-to-preconditioning-squat-exercise-increases-cycling-sprint-performance
#8
Sébastien Duc, Bent R Rønnestad, William Bertucci
This study investigated the effect of performing a preconditioning exercise with or without whole-body vibration (WBV) on a subsequent cycling sprint performance. Fourteen trained subjects performed two separate test sessions in randomized order. After a warm-up, the preconditioning exercise (body-loaded half squats) was applied: 30-seconds of half-squats with WBV (40 Hz, 2 mm) or 30-seconds of half-squats without WBV with a 10-second all-out sprint performed after one minute. Surface electromyography (EMG) was measured from the vastus medialis, vastus lateralis and gastrocnemius medialis during the sprints...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28900719/the-effects-of-exercise-induced-muscle-damage-on-critical-torque
#9
Marcin K Szczyglowski, Carl J Ade, Jason A Campbell, Christopher D Black
OBJECTIVE: Exercise-induced muscle damage (EIMD) has been shown to reduce endurance exercise performance. This study examined the effects of EIMD on critical torque (CT) and the sum of the torque integral above CT during (∫ T total) during a 5-min all-out, intermittent isometric knee extension exercise. METHODS: CT was determined in eight participants prior to and 48-h following EIMD. EIMD was induced using electrically stimulated eccentric knee extensions until maximal voluntary strength (MVC) was reduced by 40%...
September 12, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28895466/lower-limb-muscle-activity-during-table-tennis-strokes
#10
Yann Le Mansec, Sylvain Dorel, François Hug, Marc Jubeau
This study aimed to compare the muscle activity of lower limbs across typical table tennis strokes. Fourteen high-level players participated in this study in which five typical strokes (backhand top, forehand top, forehand spin, forehand smash, flick) were analysed. Surface electromyography activity (EMG) of eight muscles was recorded (gluteus maximus, biceps femoris, vastus medialis, vastus lateralis, rectus femoris, gastrocnemius medialis, gastrocnemius lateralis, soleus) and normalised to the maximal activity measured during squat jump or isometric maximal voluntary contractions...
September 12, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28894422/does-heel-height-cause-imbalance-during-sit-to-stand-task-surface-emg-perspective
#11
Ganesh R Naik, Ahmed Al-Ani, Massimiliano Gobbo, Hung T Nguyen
The purpose of this study was to determine whether electromyography (EMG) muscle activities around the knee differ during sit-to-stand (STS) and returning task for females wearing shoes with different heel heights. Sixteen healthy young women (age = 25.2 ± 3.9 years, body mass index = 20.8 ± 2.7 kg/m(2)) participated in this study. Electromyography signals were recorded from the two muscles, vastus medialis (VM) and vastus lateralis (VL) that involve in the extension of knee. The participants wore shoes with five different heights, including 4, 6, 8, 10, and 12 cm...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28889225/effects-of-blood-flow-restriction-during-moderate-intensity-eccentric-knee-extensions
#12
Michael Behringer, Lars Heinke, Jannik Leyendecker, Joachim Mester
We investigated if blood flow restriction (BFR, cuff pressure 20 mmHG below individual occlusion pressure) increases metabolic stress, hormonal response, release of muscle damage markers, and muscle swelling induced by moderate-intensity eccentric contractions. In a randomized, matched-pair design, 20 male subjects (25.3 ± 3.3 years) performed four sets of unilateral eccentric knee extensions (75% 1RM) to volitional failure with (IG) or without (CG) femoral BFR. Despite significant differences of performed repetitions between IG (85...
September 9, 2017: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28880219/influence-of-skeletal-muscle-carnosine-content-on-fatigue-during-repeated-resistance-exercise-in-recreationally-active-women
#13
Alyssa N Varanoske, Jay R Hoffman, David D Church, Ran Wang, Kayla M Baker, Sarah J Dodd, Nicholas A Coker, Leonardo P Oliveira, Virgil L Dawson, David H Fukuda, Jeffrey R Stout
Carnosine is a naturally occurring intramuscular dipeptide that is thought to attenuate fatigue during high-intensity exercise. Carnosine content is influenced by various factors, including gender and diet. Despite research reporting that carnosine content is lower in women compared to men and lower in vegetarians compared to omnivores, no investigations have examined carnosine content in women based on dietary protein intake and its effect on muscle fatigue. Twenty recreationally active women were assigned to either a high (HI; n = 5), moderate (MOD; n = 10), or low (LO; n = 5) group based upon intramuscular carnosine content of the vastus lateralis...
September 7, 2017: Nutrients
https://www.readbyqxmd.com/read/28872396/whole-body-vibration-on-performance-of-quadriceps-after-acl-reconstruction-a-blinded-randomized-controlled-trial
#14
Karinna Sonálya Aires da Costa, Daniel Tezoni Borges, Liane de Brito Macedo, Caio Alano de Almeida Lins, Jamilson Simões Brasileiro
CONTEXT: Whole body vibration (WBV) has been widely used in clinical and sport practice. These devices produce constant vibrations originating symmetrical waves that move along the vertical axis. It is suggested that mechanical stimuli produced by high vibration can be an alternative to improve neuromuscular performance and balance in different populations. However, there is still a lack of consensus in the literature regarding neurophysiological responses in the skeletal muscle immediately after the use of WBV, specifically in individuals subjected to ACL reconstruction...
September 5, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28868988/effects-of-resistance-guided-high-intensity-interval-functional-electrical-stimulation-cycling-on-an-individual-with-paraplegia-a-case-report
#15
David R Dolbow, Daniel P Credeur
BACKGROUND AND PURPOSE: Individuals with spinal cord injury (SCI) are more than twice as likely to develop and die from cardio-metabolic diseases as compared to able-bodied. This increased risk is thought to be in part due to accelerated muscle atrophy and reduced blood flow through sublesional arteries. Thus, strategies to recondition paralyzed skeletal muscles may help reduce cardio-metabolic disease risk. The purpose of this case report was to examine the impact of a novel, resistance-guided, high intensity interval training functional electrical stimulation (RG-HIIT-FES) cycling program on cardio-metabolic health in people with chronic SCI...
September 4, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28864949/skeletal-muscle-mitochondrial-mass-is-linked-to-lipid-and-metabolic-profile-in-individuals-with-spinal-cord-injury
#16
Laura C O'Brien, Qun Chen, Jeannie Savas, Edward J Lesnefsky, Ashraf S Gorgey
PURPOSE: Changes in metabolism and body composition after spinal cord injury (SCI) predispose individuals to obesity, type II diabetes, and cardiovascular disease. A link between lean mass and skeletal muscle mitochondrial mass has been reported but it is unknown how skeletal muscle mitochondrial mass and activity impact metabolic health. This study examined the relationship between skeletal muscle mitochondrial mass, activity and metabolic profile in individuals with chronic SCI. METHODS: Twenty-two men with motor complete SCI participated in the study...
September 1, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28862046/glucose-metabolism-and-metabolic-flexibility-in-cultured-skeletal-muscle-cells-is-related-to-exercise-status-in-young-male-subjects
#17
Jenny Lund, Daniel S Tangen, Håvard Wiig, Hans K Stadheim, Siw A Helle, Jesper B Birk, Thorsten Ingemann-Hansen, Arild C Rustan, G Hege Thoresen, Jørgen F P Wojtaszewski, Eili T Kase, Jørgen Jensen
We hypothesised that skeletal muscles of healthy young people have a large variation in oxidative capacity and fibre-type composition, and aimed therefore to investigate glucose metabolism in biopsies and myotubes isolated from musculus vastus lateralis from healthy males with varying degrees of maximal oxygen uptake. Trained and intermediary trained subjects showed higher carbohydrate oxidation in vivo. Fibre-type distribution in biopsies and myotubes did not differ between groups. There was no correlation between fibre-type I expression in biopsies and myotubes...
September 1, 2017: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28857748/effects-of-fatigue-and-recovery-on-electromechanical-delay-during-isokinetic-muscle-actions
#18
Cory M Smith, Terry J Housh, Ethan C Hill, Joshua L Keller, Glen O Johnson, Richard J Schmidt
Examine muscle-specific differences and the effects of fatigue and recovery on electromechanical delay (EMD) during maximal isokinetic muscle actions. Approach: Thirteen men performed maximal isokinetic knee extension muscle actions at 60ºs-1, pretest, posttest, and after 5-min of recovery from 25 maximal isokinetic knee extensions. The onsets of the electromyographic, mechanomyographic, and force signals were used to identify EMD measures from the vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF)...
August 31, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28843087/are-there-mode-specific-and-fatigue-related-electromechanical-delay-responses-for-maximal-isokinetic-and-isometric-muscle-actions
#19
Cory M Smith, Terry J Housh, Ethan C Hill, Joshua L Keller, Glen O Johnson, Richard J Schmidt
This study used a combined electromyographic, mechanomyographic, and force approach to identify electromechanical delay (EMD) from the onsets of the electromyographic to force signals (EMDE-F), onsets of the electromyographic to mechanomyogrpahic signals (EMDE-M), and onsets of mechanomyographic to force signals (EMDM-F). The purposes of the current study were to examine: (1) differences in EMDE-M, EMDM-F, and EMDE-F from the vastus lateralis between maximal isokinetic and maximal concentric isometric leg extensions; and (2) the effects of fatigue and recovery on EMDE-M, EMDM-F, and EMDE-F...
August 23, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28838188/administering-multiple-injectable-vaccines-during-a-single-visit-summary-of-findings-from-the-accelerated-introduction-of-inactivated-polio-vaccine-globally
#20
REVIEW
Samantha B Dolan, Manish Patel, Lee M Hampton, Eleanor Burnett, Daniel C Ehlman, Julie Garon, Emily Cloessner, Elizabeth Chmielewski, Terri B Hyde, Carsten Mantel, Aaron S Wallace
Background: In 2013, the World Health Organization's (WHO's) Strategic Advisory Group of Experts (SAGE) recommended that all 126 countries using only oral polio vaccine (OPV) introduce at least 1 dose of inactivated polio vaccine (IPV) into their routine immunization schedules by the end of 2015. In many countries, the addition of IPV would necessitate delivery of multiple injectable vaccines (hereafter, "multiple injections") during a single visit, with infants receiving IPV alongside pentavalent vaccine (which covers diphtheria, tetanus, and whole-cell pertussis; hepatitis B; and Haemophilus influenzae type b) and pneumococcal vaccine...
July 1, 2017: Journal of Infectious Diseases
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