keyword
MENU ▼
Read by QxMD icon Read
search

pedal mechanics

keyword
https://www.readbyqxmd.com/read/27856712/rates-of-performance-loss-and-neuromuscular-activity-in-men-and-women-during-cycling-evidence-for-a-common-metabolic-basis-of-muscle-fatigue
#1
Christopher W Sundberg, Sandra K Hunter, Matthew W Bundle
The durations that muscular force and power outputs can be sustained until failure fall predictably on an exponential decline between an individual's 3-s burst maximum to the maximum performance they can sustain aerobically. The exponential time constants describing these rates of performance loss are similar across individuals suggesting that a common metabolically-based mechanism governs muscle fatigue; however, these conclusions come from studies mainly on men. To test whether the same physiological understanding can be applied to women, we compared the performance-duration relationships and neuromuscular activity between 7 men (23...
November 17, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27746738/the-physiological-mechanisms-of-performance-enhancement-with-sprint-interval-training-differ-between-the-upper-and-lower-extremities-in-humans
#2
Christoph Zinner, David Morales-Alamo, Niels Ørtenblad, Filip J Larsen, Tomas A Schiffer, Sarah J Willis, Miriam Gelabert-Rebato, Mario Perez-Valera, Robert Boushel, Jose A L Calbet, Hans-Christer Holmberg
To elucidate the mechanisms underlying the differences in adaptation of arm and leg muscles to sprint training, over a period of 11 days 16 untrained men performed six sessions of 4-6 × 30-s all-out sprints (SIT) with the legs and arms, separately, with a 1-h interval of recovery. Limb-specific VO2peak, sprint performance (two 30-s Wingate tests with 4-min recovery), muscle efficiency and time-trial performance (TT, 5-min all-out) were assessed and biopsies from the m. vastus lateralis and m. triceps brachii taken before and after training...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27736025/thermally-induced-intra-carboxyl-proton-shuttle-in-a-molecular-rack-and-pinion-cascade-achieving-macroscopic-crystal-deformation
#3
You-Gui Huang, Yoshihito Shiota, Sheng-Qun Su, Shu-Qi Wu, Zi-Shuo Yao, Guo-Ling Li, Shinji Kanegawa, Soonchul Kang, Takashi Kamachi, Kazunari Yoshizawa, Katsuhiko Ariga, Osamu Sato
Proton transport via dynamic molecules is ubiquitous in chemistry and biology. However, its use as a switching mechanism for properties in functional molecular assemblies is far less common. In this study, we demonstrate how an intra-carboxyl proton shuttle can be generated in a molecular assembly akin to a rack-and-pinion cascade via a thermally induced single-crystal-to-single-crystal phase transition. In a triply interpenetrated supramolecular organic framework (SOF), a 4,4'-azopyridine (azpy) molecule connects to two biphenyl-3,3',5,5'-tetracarboxylic acid (H4 BPTC) molecules to form a functional molecular system with switchable mechanical properties...
November 14, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27664385/assessment-of-anoxia-tolerance-and-photoperiod-dependence-of-gabaergic-polarity-in-the-pond-snail-lymnaea-stagnalis
#4
Leslie T Buck, Hilary C Bond, Aqsa Malik
The pond snail Lymnaea stagnalis is reported to be anoxia-tolerant and if the tolerance mechanism is similar to that of the anoxia-tolerant painted turtle, GABA should play an important role. A potentially confounding factor investigating the role of GABA in anoxia tolerance are reports that GABA has both inhibitory and excitatory effects within L. stagnalis central ganglion. We therefore set out to determine if seasonality or photoperiod has an impact on: 1) the anoxia-tolerance of the intact pond snail, and 2) the response of isolated neuroganglia cluster F neurons to exogenous GABA application...
September 21, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27651150/investigating-motor-initiation-and-inhibition-deficits-in-patients-with-parkinson-s-disease-and-freezing-of-gait-using-a-virtual-reality-paradigm
#5
Matthew J Georgiades, Moran Gilat, Kaylena A Ehgoetz Martens, Courtney C Walton, Patrick G Bissett, James M Shine, Simon J G Lewis
Freezing of gait (FOG) is a common, disabling symptom of Parkinson's disease (PD) that is associated with deficits in motor initiation and inhibition. Understanding of underlying neurobiological mechanisms has been limited by difficulties in eliciting and objectively characterizing such gait phenomena in the clinical setting. However, recent work suggests that virtual reality (VR) techniques might offer the potential to study motor control. This study utilized a VR paradigm to explore deficits in motor initiation and stopping performance, including stop failure in PD patients with (Freezers, 31) and without (Non-Freezers, 23) FOG, and healthy age-matched Controls (15)...
September 17, 2016: Neuroscience
https://www.readbyqxmd.com/read/27636740/neuraxial-anesthesia-reduces-lymphatic-flow-proof-of-concept-in-first-in-human-study
#6
Jonathan G Hiller, Hilmy M Ismail, Michael S Hofman, Kailash Narayan, Shakher Ramdave, Bernhard J Riedel
Dilation of lymphatic vessels may contribute to iatrogenic dissemination of cancer cells during surgery. We sought to determine whether neuraxial anesthesia reduces regional lymphatic flow. Using nuclear lymphoscintigraphy, 5 participants receiving spinal anesthesia for brachytherapy had lower extremity lymph flow at rest compared with flow under conditions of spinal anesthesia. Six limbs were analyzed. Four limbs were excluded because of failure to demonstrate lymph flow (1 patient, 2 limbs), colloid injection error (1 limb), and undiagnosed deep vein thrombosis (1 limb)...
September 15, 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27544621/quantifying-achilles-tendon-force-in-vivo-from-ultrasound-images
#7
Taylor J M Dick, Allison S Arnold, James M Wakeling
This study evaluated a procedure for estimating in vivo Achilles tendon (AT) force from ultrasound images. Two aspects of the procedure were tested: (i) accounting for subject-specific AT stiffness and (ii) accounting for changes in the relative electromyographic (EMG) intensities of the three triceps surae muscles. Ten cyclists pedaled at 80rpm while a comprehensive set of kinematic, kinetic, EMG, and ultrasound data were collected. Subjects were tested at four crank loads, ranging from 14 to 44Nm (115 to 370W)...
October 3, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27439394/an-association-between-membranoproliferative-glomerulonephritis-and-metastatic-colorectal-carcinoma-a-case-report
#8
Samuel Chan, Kimberley A Oliver, Nicholas A Gray
BACKGROUND: Membranoproliferative glomerulonephritis is a common pattern of glomerular injury in monoclonal gammopathy, but has only rarely been associated with solid organ tumors, mainly lung, renal, gastric, breast, and prostate. There have been two reported cases of membranoproliferative glomerulonephritis associated with adenocarcinoma of the colon and rectum, although the association may be coincidental. We report a case where nephrotic syndrome due to membranoproliferative glomerulonephritis developed in a patient with colorectal carcinoma and elucidate some of the pathophysiological mechanisms underpinning this presentation...
July 20, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27413175/total-intravenous-anaesthesia-using-propofol-and-sufentanil-allows-controlled-long-term-ventilation-in-rabbits-without-neuromuscular-blocking-agents
#9
Verena Reupke, Karoline Walliser, Thorsten Perl, Sarah Kimmina, Anke Schraepler, Michael Quintel, Nils Kunze-Szikszay
The aim of this study was to evaluate a total intravenous anaesthesia (TIVA) protocol using propofol and sufentanil without neuromuscular blocking agents (NBAs) for a non-recovery lung pathology study in rabbits including 10 h of pressure-controlled ventilation. TIVA was started with 20 mg/kg/h propofol and 0.5 µg/kg/h sufentanil. The depth of anaesthesia was assessed by reflex testing and monitoring of spontaneous movements or respiratory efforts. Vital parameters were monitored to assess the effects of the TIVA protocol...
July 13, 2016: Laboratory Animals
https://www.readbyqxmd.com/read/27398810/excited-state-decay-in-the-photoisomerization-of-azobenzene-a-new-balance-between-mechanisms
#10
Josep Casellas, Michael J Bearpark, Mar Reguero
The mechanism of the photoisomerization of azobenzene has been studied by means of multiconfigurational ab initio calculations. Our results show that it is necessary to account for the dynamic electron correlation in the location of the critical points (CASPT2 optimizations) to obtain a correct description of the topography of the potential energy surfaces of the low-energy singlet excited states. Using this methodology, we have found that the state populated by the initial excitation is the S2 (ππ*) state, which decays very efficiently to the S1 (nπ*) state at a pedal-like non-rotated geometry...
July 11, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27334823/neuronal-projections-from-the-haller-s-organ-and-palp-sensilla-to-the-synganglion-of-amblyomma-americanum%C3%A2
#11
Lígia Miranda Ferreira Borges, Andrew Yongsheng Li, Pia Untalan Olafson, Robert Renthal, Gary Roy Bauchan, Kimberly Hutchison Lohmeyer, Adalberto Angel Pérez de León
The present study was conducted to elucidate the neuronal pathways between peripheral olfactory and taste sensilla and the synganglion in an Ixodidae tick species. The tarsus of the front legs (olfactory nerves) and the fourth palpal segment (gustatory nerves) of unfed Amblyomma americanum males and females were excised. A neuronal tracer, dextran tetramethylrhodamine, was used for filling of the sensory neurons. The synganglion preparations were examined using a confocal microscope. Neuronal arborizations from the Haller's organ were confined to the olfactory lobes and the first pedal ganglion...
June 14, 2016: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/27304521/neuronal-projections-from-the-haller-s-organ-and-palp-sensilla-to-the-synganglion-of-amblyomma-americanum%C3%A2
#12
Lígia Miranda Ferreira Borges, Andrew Yongsheng Li, Pia Untalan Olafson, Robert Renthal, Gary Roy Bauchan, Kimberly Hutchison Lohmeyer, Adalberto Angel Pérez de León
The present study was conducted to elucidate the neuronal pathways between peripheral olfactory and taste sensilla and the synganglion in an Ixodidae tick species. The tarsus of the front legs (olfactory nerves) and the fourth palpal segment (gustatory nerves) of unfed Amblyomma americanum males and females were excised. A neuronal tracer, dextran tetramethylrhodamine, was used for filling of the sensory neurons. The synganglion preparations were examined using a confocal microscope. Neuronal arborizations from the Haller's organ were confined to the olfactory lobes and the first pedal ganglion...
June 14, 2016: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/27260247/heart-rate-regulation-during-cycle-ergometer-exercise-via-event-driven-biofeedback
#13
Ahmadreza Argha, Steven W Su, Branko G Celler
This paper is devoted to the problem of regulating the heart rate response along a predetermined reference profile, for cycle-ergometer exercises designed for training or cardio-respiratory rehabilitation. The controller designed in this study is a non-conventional, non-model-based, proportional, integral and derivative (PID) controller. The PID controller commands can be transmitted as biofeedback auditory commands, which can be heard and interpreted by the exercising subject to increase or reduce exercise intensity...
June 3, 2016: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/27127574/defining-the-collateral-flow-of-posterior-tibial-artery-and-dorsalis-pedis-artery-in-ischemic-foot-disease-is-it-a-preventing-factor-for-ischemia
#14
Onur Tutar, Duzgun Yildirim, Cesur Samanci, Babak Rafiee, Kaan Inan, Suleyman Dikici, Fethi Emre Ustabasioglu, Gokhan Kuyumcu
BACKGROUND: Critical limb ischemia, a worldwide prevalent morbidity cause, is mostly secondary to vascular insufficiency due to atherosclerosis. The disease presents with intermittent claudication, which can progress to critical limb ischemia requiring amputation. Research has emphasized that the quality or existence of the pedal arch have a direct effect on wound healing and, therefore, on limb salvage, through the mechanism of collateral vascularization to the ischemic regions. OBJECTIVES: This study aimed to determine the existence and, if present, grade of retrograde blood flow from plantar arch to dorsal foot artery (dorsalis pedis artery, DPA)...
January 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27000902/an-interactive-method-for-achieving-ergonomically-optimum-conditions-during-laparoscopic-surgery
#15
Chang-Lin Hu, Ching-Yao Yang, Zhan-Sheng Lin, Shan-Yi Yang, Chien-Hung Kuo, Ming-Tsan Lin
Laparoscopy is widely used during living kidney donation, nephrectomy, bariatric surgery, and surgery for gastrointestinal tumors and colorectal cancer. However, laparoscopic surgery requires prolonged use of instruments and has low mechanical efficiency. In addition, to meet specific surgical demands while visualizing the surgical area on the screen, surgical personnel frequently violate the postures proposed by human factor engineering; this naturally results in a physical burden on the personnel. In this study, using laparoscopic nephrectomy as an example, an auxiliary hoisting device for surgery was designed, and pedals from a variety of equipment were integrated into the auxiliary plant...
June 2013: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/26964881/photoisomerization-mechanisms-from-trans-trans-1-4-diphenyl-1-3-butadiene-casscf-on-the-fly-trajectory-surface-hopping-dynamic-simulations
#16
Xiaolei Zheng, Gaohong Zhai, Wanqing Gao, Yibo Lei, Le Yu, Chaoyuan Zhu
We have employed the SA2-CAS(4,4)/6-31G ab initio method together with an on-the-fly global-switching trajectory surface hopping algorithm to simulate photoisomerization reaction dynamics from reactant trans, trans-1,4-diphenyl-1,3-butadiene (DPB) to products cis,trans-DPB and cis,cis-DPB. This topic has been extensively studied experimentally and the present theoretical study is the first to simulate DPB photoisomerization reaction dynamics as far as we know. With total 600 sampling trajectories, 300 actively contribute to isomerization reaction via two conical intersections between the electronic ground and the first excited states...
April 7, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/26913135/methods-for-dynamic-characterization-of-the-major-muscles-activating-the-lower-limb-joints-in-cycling-motion
#17
Navit Roth, Avi Wiener, Joseph Mizrahi
The functional activation, through electrical stimulation, of the lower limb consisting of several deficient muscles requires well-patterned and coordinated activation of these muscles. This study presents a method for characterizing the parameters of the major muscle groups controlling the ankle and knee joints in cycling motion, the latter having particular significance in the rehabilitation of locomotion. To lower mechanical indeterminacy in the joints the system is reduced by grouping the muscles acting in synergism...
September 23, 2014: European Journal of Translational Myology
https://www.readbyqxmd.com/read/26852445/risk-factors-for-road-traffic-accidents-in-gulu-municipality-uganda
#18
F P Pebalo, N M Kwikiriza, C Kiyita, T Mahaba, E Muwanga, A A Tinka, H T Robert, E Tuhairwe, E I Odongo-Aginya
BACKGROUND: Currently Road Traffic Accidents (RTA) are ranked tenth among the leading causes of death and ninth among all leading causes of disability worldwide. There has been no published study on RTA in Gulu municipality. There is a high frequency of RTA in Gulu municipality with poor road design and inadequate knowledge on road safety precaution among road users. OBJECTIVES: To establish the causes of Road Traffic Accidents (RTA), establish the safety measures in place to protect road users to avoid RTA and establish people mostly involved and the mechanism of RTA...
October 2012: East African Medical Journal
https://www.readbyqxmd.com/read/26793117/task-failure-during-exercise-to-exhaustion-in-normoxia-and-hypoxia-is-due-to-reduced-muscle-activation-caused-by-central-mechanisms-while-muscle-metaboreflex-does-not-limit-performance
#19
Rafael Torres-Peralta, David Morales-Alamo, Miriam González-Izal, José Losa-Reyna, Ismael Pérez-Suárez, Mikel Izquierdo, José A L Calbet
To determine whether task failure during incremental exercise to exhaustion (IE) is principally due to reduced neural drive and increased metaboreflex activation eleven men (22 ± 2 years) performed a 10 s control isokinetic sprint (IS; 80 rpm) after a short warm-up. This was immediately followed by an IE in normoxia (Nx, PIO2:143 mmHg) and hypoxia (Hyp, PIO2:73 mmHg) in random order, separated by a 120 min resting period. At exhaustion, the circulation of both legs was occluded instantaneously (300 mmHg) during 10 or 60 s to impede recovery and increase metaboreflex activation...
2015: Frontiers in Physiology
https://www.readbyqxmd.com/read/26760948/ankle-fracture-patterns-in-drivers-are-associated-with-femoral-fracture-higher-bmi-and-advanced-age
#20
Aaron Wynkoop, Osy Ndubaku, Andrew Fras, Norman Walter, Jeremy Eekhoff, Theresa Atkinson
OBJECTIVE: Despite advances in vehicle safety systems, motor vehicle crashes continue to cause ankle fractures. This study attempts to provide insight into the mechanisms of injury and to identify the at-risk population groups. METHODS: A study was made of ankle fractures patients treated at an urban level 1 trauma center following motor vehicle crashes, with a concurrent analysis of a nationally representative crash data set. The national data set focused on ankle fractures in drivers involved in frontal crashes...
July 3, 2016: Traffic Injury Prevention
keyword
keyword
103105
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"