Read by QxMD icon Read

pedal mechanics

Susan M Linder, Anson B Rosenfeldt, Andrew S Bazyk, Mandy Miller Koop, Sarah Ozinga, Jay L Alberts
Background Individuals with stroke present with motor control deficits resulting in the abnormal activation and timing of agonist and antagonist muscles and inefficient movement patterns. The analysis of pedaling biomechanics provides a window into understanding motor control deficits, which vary as a function of workload. Understanding the relationship between workload and motor control is critical when considering exercise prescription during stroke rehabilitation. Objectives To characterize pedaling kinematics and motor control processes under conditions in which workload was systematically increased to an eventual patient-specific maximum...
February 15, 2018: Topics in Stroke Rehabilitation
Niels-Peter Brøchner Nielsen, François Hug, Arnaud Guével, Floren Colloud, Julien Lardy, Sylvain Dorel
PURPOSE: This study investigated how muscle coordination is adjusted in response to a decrease in the force-generating capacity of one muscle group during a sprint cycling task. METHODS: Fifteen participants were tested during a sprint before and after a fatigue electromyostimulation protocol was conducted on the quadriceps of one leg. Motor coordination was assessed by measuring myoelectrical activity, pedal force and joint power. RESULTS: The decrease in force-generating capacity of the quadriceps (-28...
February 9, 2018: Medicine and Science in Sports and Exercise
Hani El-Mowafi, Ahmed El-Hawary, Yasser Kandil
BACKGROUND: Charcot arthropathy of the peritalar complex carries a high risk of amputation if not properly managed. Our aim is to assess the functional outcome of severe Charcot arthropathy of the peritalar complex following enblock resection of the ulcer, massive debridement and stabilizing all the elements of the peritalar complex. METHODS: We prospectively studied 38 feet in 35 patients with peritalar complex Charcot arthropathy. All Feet underwent intense debridement and fusion using a combination of (Ilizarov) external fixation, and (plate and locked nail) internal fixation...
March 6, 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
Veniamin A Borin, Christian Wiebeler, Igor Schapiro
The primary photochemical reaction of the green-absorbing proteorhodopsin is studied by means of a hybrid quantum mechanics/molecular mechanics (QM/MM) approach. The simulations are based on a homology model derived from the blue-absorbing proteorhodopsin crystal structure. The geometry of retinal and the surrounding sidechains in the protein binding pocket were optimized using the QM/MM method. Starting from this geometry the isomerization was studied with a relaxed scan along the C13[double bond, length as m-dash]C14 dihedral...
February 2, 2018: Faraday Discussions
Yoriko Sonoda, Midori Goto, Kunihiro Ichimura
Higher order derivative spectra were applied at first to one-way ZEZ-to-EEE photoisomerisation of dimethyl ester (ZEZ-DPH1) of the titled compound in a methylcyclohexane solution. Many common crossing points emerged in UV-induced derivative-spectral changes to reveal the direct ZEZ-to-EEE photoisomerisation without the transient formation of an intermediate to suggest the bicycle-pedal mechanism. The solid-state photoisomerisation was subsequently monitored by tracing changes in the fourth-order derivatives of absorption spectra of a thin crystalline layer of ZEZ-DPH1 prepared by the drop-casting method, because the distortion of absorption spectra due to light scattering is cancelled...
January 24, 2018: Photochemical & Photobiological Sciences
Jun-Peng Chen, Rui-Fu Chen, A-Jing Peng, Chen-Hui Xu, Guo-Ying Li
Background: The mechanism of compensatory hyperhidrosis remains unclear. The aim of this study was to explore the relationship between compensatory hyperhidrosis and thoracic sympathetic ganglion excitability to assess the effectiveness of thoracoscopic T4 sympathicotomy for treating palmar hyperhidrosis. Methods: Sixty-six cases of T4 sympathetic ganglions were prospectively collected from patients with palmar hyperhidrosis who underwent thoracoscopic T4 sympathicotomy from 2013 to 2016 in our department...
September 2017: Journal of Thoracic Disease
Michael Lichtenberg, Michiel A Schreve, Roberto Ferraresi, Daniel A F van den Heuvel, Çagdas Ünlü, Vincent Cabane, Steven Kum
Patients with critical limb ischaemia have a poor life expectancy. Aggressive revascularization is accepted in order to preserve their independence in the final phase of their lives. Bypass surgery and more recently endovascular interventions with angioplasty and stenting have become the treatment of choice to prevent amputation and to resolve pain. However, as many as 20 % of patients with critical limb ischaemia are unsuitable candidates for a vascular intervention because of extensive occlusions of outflow in the crural and pedal vessels...
October 25, 2017: VASA. Zeitschrift Für Gefässkrankheiten
Jing Li, Yun Zhang, Sai Liu, Jianlin Liu
Many living creatures possess extremely strong capability of adhesion, which has aroused great attention of many scientists and engineers. Based on the self-developed equipment, we measured the normal and shear adhesion strength of the abalone underwater and out of water on different contact surfaces. It is found that the adhesion force of the abalone can amount to 200 or 300 times its body weight. The effects of wettability and roughness of the surface, and the frictional coefficient of mucus on the adhesion strength have been discussed...
September 22, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Martin Flück, Rebekka Bosshard, Max Lungarella
Eccentric types of endurance exercise are an acknowledged alternative to conventional concentric types of exercise rehabilitation for the cardiac patient, because they reduce cardiorespiratory strain due to a lower metabolic cost of producing an equivalent mechanical output. The former contention has not been tested in a power- and work-matched situation of interval-type exercise under identical conditions because concentric and eccentric types of exercise pose specific demands on the exercise machinery, which are not fulfilled in current practice...
2017: Frontiers in Physiology
Thomas Fuglsang, Johnny Padulo, Massimo Spoladore, Michele Dalla Piazza, Luca P Ardigò
There is a lack of human-powered watercrafts for people with lower-body disabilities. The purpose of this study was therefore to develop a watercraft for disabled people and investigate the metabolic cost and efficiency when pedaling. The watercraft was designed by combining parts of a waterbike and a handbike. Nine able-bodied subjects pedaled the watercraft at different speeds on a lake to provide steady-state metabolic measurements, and a deceleration test was performed to measure the hydrodynamic resistance of the watercraft...
2017: Frontiers in Physiology
Céline N Bürki, Stephanie A Bridenbaugh, Julia Reinhardt, Christoph Stippich, Reto W Kressig, Maria Blatow
INTRODUCTION: In geriatric clinical diagnostics, gait analysis with cognitive-motor dual tasking is used to predict fall risk and cognitive decline. To date, the neural correlates of cognitive-motor dual tasking processes are not fully understood. To investigate these underlying neural mechanisms, we designed an fMRI paradigm to reproduce the gait analysis. METHODS: We tested the fMRI paradigm's feasibility in a substudy with fifteen young adults and assessed 31 healthy older adults in the main study...
August 2017: Brain and Behavior
Charles Lambelet, Mingxing Lyu, Daniel Woolley, Roger Gassert, Nicole Wenderoth
Chronic wrist impairment is frequent following stroke and negatively impacts everyday life. Rehabilitation of the dysfunctional limb is possible but requires extensive training and motivation. Wearable training devices might offer new opportunities for rehabilitation. However, few devices are available to train wrist extension even though this movement is highly relevant for many upper limb activities of daily living. As a proof of concept, we developed the eWrist, a wearable one degree-of-freedom powered exoskeleton which supports wrist extension training...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
Anthony Bouillod, Frederic Grappe
Cyclists regularly change from a seated to a standing position when the gradient increases during uphill cycling. The aim of this study was to analyse the physiological and biomechanical responses between seated and standing positions during distance-based uphill time trials in elite cyclists. Thirteen elite cyclists completed two testing sessions that included an incremental-specific cycling test on a cycle ergometer to determine VO2max and three distance-based uphill time trials in the field to determine physiological and biomechanical variables...
August 4, 2017: Journal of Sports Sciences
Alexandra Kerbl, Markus Conzelmann, Gáspár Jékely, Katrine Worsaae
Neuropeptides are conserved metazoan signaling molecules, and represent useful markers for comparative investigations on the morphology and function of the nervous system. However, little is known about the variation of neuropeptide expression patterns across closely related species in invertebrate groups other than insects. In this study, we compare the immunoreactivity patterns of 14 neuropeptides in three closely related microscopic dinophilid annelids (Dinophilus gyrociliatus, D. taeniatus and Trilobodrilus axi)...
July 26, 2017: Journal of Comparative Neurology
Achraf El Bakkaly, Fouad Ettayebi, Houda Oubeja, Mounir Erraji, Hicham Zerhouni
Traumatic dislocation of the hip in children is a rare disease. It only represents 5% of hip dislocations in all age groups. Before 10 years, the mechanism is often a minimal domestic accident; after 10 years, the dislocation occurs with the waning of an accident of the public highway. It is different from that of the adult by its rarity, its ease of reduction and better prognosis. This is an emergency trauma: risk necrosis of the femoral head (If delayed reduction). We report a rare case of a 3 year old boy, who suffered from bipolar trauma after a fall near his height of his house causing him a detachment of the right humerus and post-traumatic dislocation of the left hip...
2017: Pan African Medical Journal
Yi Zhou, Evan J Ryer, Robert P Garvin, Jeremy L Irvan, James R Elmore
BACKGROUND: Adductor canal compression syndrome is a rare non-atherosclerotic cause of arterial occlusion and limb ischemia. PRESENTATION OF CASE: The patient is an 18-year-old healthy female who presented to the emergency department with acute left lower extremity ischemia. Her symptoms began as sudden onset mild foot pain approximately two months ago. Over the 72h prior to presentation, she developed severe pain, pallor, paralysis, loss of pedal pulses, paresthesia, and poikilothermia...
2017: International Journal of Surgery Case Reports
D Taylor LA Salle, Robert Shute, Matthew Heesch, Dustin Slivka
The American College of Sports Medicine (ACSM) recommends adults participate in weekly aerobic activity for a minimum of 30 minutes moderate intensity exercise 5 days per week or 20 minutes of vigorous activity 3 days per week. The electrically assisted bicycle may help individuals achieve the ACSM's aerobic recommendations and introduce inactive individuals to physical activity. To compare the physiological requirements of riding a bicycle with electric pedal assist versus non-assist among healthy active young adults...
2017: International Journal of Exercise Science
Naomichi Ogihara, Motoharu Oishi, Ryogo Kanai, Hikaru Shimada, Takahiro Kondo, Kimika Yoshino-Saito, Junichi Ushiba, Hideyuki Okano
The common marmoset, Callithrix jacchus, is a small New World monkey that has recently gained attention as an important experimental animal model in the field of neuroscience as well in rehabilitative and regenerative medicine. This attention reflects the closer phylogenetic relationship between humans and common marmosets compared to that between humans and other experimental animals. When studying the neuronal mechanism behind various types of neurological motor disorders using the common marmoset, possible differences in muscle parameters (e...
July 2017: Primates; Journal of Primatology
Lena Grimmelsmann, Alireza Marefat Khah, Christian Spies, Christof Hättig, Patrick Nuernberger
Many synthetic DNA minor groove binders exhibit a strong increase in fluorescence when bound to DNA. The pharmaceutical-relevant berenil (diminazene aceturate) is an exception with an extremely low fluorescence quantum yield (on the order of 10(-4)). We investigate the ultrafast excited-state dynamics of this triazene by femtosecond time-resolved fluorescence experiments in water, ethylene glycol, and buffer and bound to the enzyme β-trypsin, the minor groove of AT-rich DNA, and G-quadruplex DNA. Ab initio calculations provide additional mechanistic insight...
May 4, 2017: Journal of Physical Chemistry Letters
Jacob T Cox, David M Gullotti, Christopher A Mecoli, Arash H Lahouti, Jemima Albayda, Julie Paik, Cheilonda Johnson, Sonye K Danoff, Andrew L Mammen, Lisa Christopher-Stine
Mechanic's hands is a well-characterized manifestation of select idiopathic inflammatory myopathy (IIM) syndromes. Less well characterized is the hyperkeratosis of the toes and plantar surface of the feet that can also accompany these disorders. We aim to describe common pedal signs in the context of IIM, and suggest that it may be another key feature in the presentation of these syndromes. A cohort of 2145 myositis patient charts gathered since 2003 were retrospectively reviewed using the key search terms "mechanic's feet" and/or "mechanic's foot...
July 2017: Clinical Rheumatology
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"