keyword
MENU ▼
Read by QxMD icon Read
search

Critical power and fatigue

keyword
https://www.readbyqxmd.com/read/29726256/all-organic-high-performance-piezoelectric-nanogenerator-with-multilayer-assembled-electrospun-nanofibers-mats-for-self-powered-multifunctional-sensor
#1
Kuntal Maity, Dipankar Mandal
Rapid development of wearable electronics, piezoelectric nanogenerator (PNG) has been paid a special attention due to its sustainable and accessible energy generation. In this context, we present a simple yet highly efficient design strategy to enhance the output performance of an all organic PNG (OPNG) based on multilayer assembled electrospun poly(vinyledine fluoride) (PVDF) nanofibers (NFs) mats where vapor phase polymerized poly(3,4- ethylenedioxythiphene) (PEDOT) coated PVDF NFs are assembled as electrodes and neat PVDF NFs is utilized as an active component...
May 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29721605/estimation-of-critical-end-test-torque-using-neuromuscular-electrical-stimulation-of-the-quadriceps-in-humans
#2
Natalie R Janzen, Robert E Hight, Darshit S Patel, Jason A Campbell, Rebecca D Larson, Christopher D Black
Characterization of critical power/torque (CP/CT) during voluntary exercise requires maximal effort, making difficult for those with neuromuscular impairments. To address this issue we sought to determine if electrically stimulated intermittent isometric exercise resulted in a critical end-test torque (ETT) that behaved similar to voluntary CT. In the first experiment participants (n = 9) completed four bouts of stimulated exercise at a 3:2 duty cycle, at frequencies of 100, 50, 25 Hz, and a low frequency below ETT (Sub-ETT; ≤ 15 Hz)...
May 2, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29673194/reliability-criteria-for-thick-bonding-wire
#3
Turker Dagdelen, Eihab Abdel-Rahman, Mustafa Yavuz
Bonding wire is one of the main interconnection techniques. Thick bonding wire is widely used in power modules and other high power applications. This study examined the case for extending the use of traditional thin wire reliability criteria, namely wire flexure and aspect ratio, to thick wires. Eleven aluminum (Al) and aluminum coated copper (CucorAl) wire samples with diameter 300 μm were tested experimentally. The wire response was measured using a novel non-contact method. High fidelity FEM models of the wire were developed and validated...
April 17, 2018: Materials
https://www.readbyqxmd.com/read/29656703/the-ethics-of-concurrent-care-for-children-a-social-justice-perspective
#4
Kim Mooney-Doyle, Jessica Keim-Malpass, Lisa C Lindley
Recent estimates indicate that over 40,000 children die annually in the United States and a majority have life-limiting conditions. Children at end of life require extensive healthcare resources, including multiple hospital readmissions and emergency room visits. Yet, many children still suffer from symptoms at end of life-including fatigue, pain, dyspnea, and anxiety-with less than 10% of these children utilizing hospice care services. A critical barrier to pediatric hospice use was the original federal regulations associated with the hospice care that required a diagnosis of 6 months to live and the discontinuation of all curative treatments...
January 1, 2018: Nursing Ethics
https://www.readbyqxmd.com/read/29566544/the-effects-of-priming-exercise-on-the-vo2-slow-component-and-the-time-course-of-muscle-fatigue-during-very-heavy-intensity-exercise-in-humans
#5
Paulo Cesar do Nascimento Salvador, Kristopher Mendes de Souza, Ricardo Dantas de Lucas, Luiz Guilherme Antonacci Guglielmo, Benedito Sérgio Denadai
We hypothesized that prior exercise would attenuate the muscle fatigue accompanied by the VO2SC behavior during a subsequent very heavy (VH) intensity cycling exercise. Thirteen healthy male subjects performed tests to determine the critical power (CP) and W' and six square-wave bouts until 3 or 8 min, each at a work rate set to deplete 70 % W' in 8 min, with an maximal isokinetic effort (MIE) before and after the conditions without (VHCON) and with prior exercise (VHEXP), to measure the cycling peak torque decrement...
March 22, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29563960/compassion-fatigue-and-substance-use-among-nurses
#6
Reem Jarrad, Sawsan Hammad, Tagreed Shawashi, Naser Mahmoud
Aim: This study aimed to detect if there were differences in compassion fatigue (CF) among nurses based on substance use and demographic variables of gender, marital status, type of health institution and income. Background: Compassion fatigue is considered an outcome of poorly handled stressful situations in which nurses may respond with self-harming behaviours like substance use. Evidence in this area is critically lacking. Methods: This study used a descriptive design to survey differences in CF of 282 nurses...
2018: Annals of General Psychiatry
https://www.readbyqxmd.com/read/29521722/effects-of-two-hours-of-heavy-intensity-exercise-on-the-power-duration-relationship
#7
Ida E Clark, Anni Vanhatalo, Stephen J Bailey, Lee J Wylie, Brett S Kirby, Brad W Wilkins, Andrew M Jones
INTRODUCTION: Changes in the parameters of the power-time relationship (critical power (CP) and W') during endurance exercise would have important implications for performance. We tested the hypotheses that CP and W', estimated using the end-test power (EP) and the work done above EP (WEP), respectively, during a the 3-min all-out test (3MT), can be reliably determined, and would be lower, after completing 2-h of heavy-intensity exercise. METHODS: In study 1, six cyclists completed a 3MT immediately following 2-h of heavy-intensity exercise on two occasions to establish the reliability of EP and WEP...
March 8, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29470151/caffeine-increases-both-total-work-performed-above-critical-power-and-peripheral-fatigue-during-a-4-km-cycling-time-trial
#8
Leandro Camati Felippe, Guilherme Assuncao Ferreira, Sara Kely Learsi, Daniel Boari, Rômulo Bertuzzi, Adriano Eduardo Lima-Silva
The link between total work performed above critical power (CP) and peripheral muscle fatigue during self-paced exercise is unknown. We investigated the influence of caffeine on the total work done above CP during a 4-km cycling time trial (TT), and the subsequent consequence on the development of central and peripheral fatigue. Nine cyclists performed three constant-load exercise trials to determine CP and two 4-km TT ~75 min after oral caffeine (5 mg·kg-1 ) or cellulose (placebo) ingestion. Neuromuscular functions were assessed before and 50 min after supplementation, and 1 min after TT...
February 22, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29401192/examination-of-a-multi-ingredient-pre-workout-supplement-on-total-volume-of-resistance-exercise-and-subsequent-strength-and-power-performance
#9
Haley C Bergstrom, M Travis Byrd, Brian J Wallace, Jody L Clasey
This study examined the acute effects of a multi-ingredient pre-workout supplement on: 1) total, lower, and upper body volume of resistance exercise; and 2) the subsequent lower body strength (isokinetic leg extension and flexion), lower (vertical jump [VJ] height), upper body power (bench-throw velocity [BTv]), and cycle ergometry performance (critical power [CP] and anaerobic work capacity [AWC]). Twelve men completed baseline strength and power measures prior to two experimental visits, supplement (SUP) and placebo (PL)...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29336155/highly-bendable-flexible-perovskite-solar-cells-on-a-nanoscale-surface-oxide-layer-of-titanium-metal-plates
#10
Gill Sang Han, Seongha Lee, Matthew Lawrence Duff, Fen Qin, Jung-Kun Lee
We report highly bendable and efficient perovskite solar cells (PSCs) that use thermally oxidized layer of Ti metal plate as an electron transport layer (ETL). The power conversion efficiency (PCE) of flexible PSCs reaches 14.9% with a short-circuit current density (Jsc ) of 17.9 mA/cm2 , open-circuit voltage (Voc ) of 1.09, and fill factor (ff) of 0.74. Moreover, the Ti metal-based PSCs exhibit a superior fatigue resistance over indium tin oxide/poly(ethylene terephthalate) substrate. Flexible PSCs maintain 100% of their initial PCE even after PSCs are bent 1000 times at a bending radius of 4 mm...
February 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29233666/emg-amplitude-fatigue-threshold-and-time-to-task-failure-a-meta-analysis
#11
REVIEW
J Matt McCrary, Bronwen J Ackermann, Mark Halaki
OBJECTIVES: Electromyographic (EMG) fatigue threshold (EMGFT ) is utilised as a correlate of critical power, torque, and force thresholds that establishes a theoretical exercise intensity-the power, torque, or force at which the rate of change of EMG amplitude (ΔEM¯G) is zero-below which neuromuscular fatigue is negligible and unpredictable. Recent studies demonstrating neuromuscular fatigue below critical thresholds raise questions about the construct validity of EMGFT . The purpose of this analysis is to evaluate the construct validity of EMGFT by aggregating ΔEM¯G and time to task failure (Tlim ) data...
November 11, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29124324/the-effect-of-mental-fatigue-on-critical-power-during-cycling-exercise
#12
Hawbeer Salam, Samuele M Marcora, James G Hopker
PURPOSE: Time to exhaustion (TTE) tests used in the determination of critical power (CP) and curvature constant (W') of the power-duration relationship are strongly influenced by the perception of effort (PE). This study aimed to investigate whether manipulation of the PE alters the CP and W'. METHODS: Eleven trained cyclists completed a series of TTE tests to establish CP and W' under two conditions, following a mentally fatiguing (MF), or a control (CON) task...
January 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29117071/deception-improves-time-trial-performance-in-well-trained-cyclists-without-augmented-fatigue
#13
Paul Ansdell, Kevin Thomas, Glyn Howatson, Markus Amann, Stuart Goodall
PURPOSE: To investigate the effects of feedback, in the form of a virtual avatar paced at 100% and 102% of baseline performance, on neuromuscular fatigue after a 4-km cycling time trial (TT). We hypothesized that improved cycling performance would occur because of the participants exceeding a previously established critical threshold and experiencing greater neuromuscular fatigue. METHODS: After familiarization, 10 well-trained cyclists performed a baseline 4-km TT without feedback (BASE), followed by two 4-km TT where they raced against an avatar (set at 100% accurate [ACC] and 102% deception [DEC] of baseline power output) in a randomized and counterbalanced order...
April 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28991714/the-pharmacological-and-non-pharmacological-interventions-for-the-management-of-fatigue-related-multiple-sclerosis
#14
REVIEW
Philippa Miller, Andrew Soundy
AIM: The clinical aim was to provide up-to-date evidence-based recommendations for the treatment of MS-related fatigue (MSRF). The scientific aim was to prioritise topics for future randomised clinical trials with sufficient power. METHODS: A systematic search of review based research that considered MSRF in adults (18years and over) was undertaken in May 2016. Data from reviews was extracted, critically appraised and synthesised using four specific techniques. RESULTS: A total of 24 reviews were identified (17 non-pharmacological, 5 pharmacological, 2 combining both), which contained 339 studies on interventions deigned to improve MSRF...
October 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28983275/cortical-substrate-of-supraspinal-fatigue-following-exhaustive-aerobic-exercise-localizes-to-a-large-cluster-in-the-anterior-premotor-cortex
#15
Priyantha Herath, Martin Carmichael, Angela Murphy, Leonardo Bonilha, Roger Newman-Norlund, Chris Rorden, Mark Davis
Strenuous exercise leads to a progressive reduction in the performance of voluntary physical exercise. This is due to a process described as fatigue and is defined as the failure to maintain the required or expected power output. While some of this is muscular in origin, there are data suggestive of how fatigue is modulated by cortical signals, leading to a concept of central fatigue. The previously reported fatigue-induced changes in cortical activity may have been due to blood oxygen-dependent (BOLD) signal drift and/or neural habituation alone...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28958430/limitations-of-oxygen-uptake-and-leg-muscle-activity-during-ascending-evacuation-in-stairways
#16
Amitava Halder, Kalev Kuklane, Chuansi Gao, Michael Miller, Mattias Delin, Johan Norén, Karl Fridolf
Stair ascending performance is critical during evacuation from buildings and underground infrastructures. Healthy subjects performed self-paced ascent in three settings: 13 floor building, 31 floor building, 33 m stationary subway escalator. To investigate leg muscle and cardiorespiratory capacities and how they constrain performance, oxygen uptake (VO2), heart rate (HR) and ascending speed were measured in all three; electromyography (EMG) in the first two. The VO2 and HR ranged from 89 to 96% of the maximum capacity reported in the literature...
January 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/28932908/the-impact-of-specialized-palliative-care-on-cancer-patients-health-related-quality-of-life-a-systematic-review-and-meta-analysis
#17
REVIEW
Angelos P Kassianos, Myria Ioannou, Marianna Koutsantoni, Haris Charalambous
PURPOSE: Specialized palliative care (SPC) is currently underutilized or provided late in cancer care. The aim of this systematic review and meta-analysis is to critically evaluate the impact of SPC on patients' health-related quality of life (HRQoL). METHODS: Five databases were searched through June 2016. Randomized controlled trials (RCTs) and prospective studies using a pre- and post- assessment of HRQoL were included. The PRISMA reporting statement was followed...
January 2018: Supportive Care in Cancer: Official Journal of the Multinational Association of Supportive Care in Cancer
https://www.readbyqxmd.com/read/28760817/non-pharmacological-interventions-for-management-of-fatigue-among-children-with-cancer-systematic-review-of-existing-practices-and-their-effectiveness
#18
Tushti Bhardwaj, Jonathan Koffman
OBJECTIVES: Fatigue is common among children living with cancer, particularly in advance stages. Little is known about the effectiveness of non-pharmacological approaches to manage this complex and distressing symptom among children. Thus, the present paper aim to critically examine the effectiveness and setting for non-pharmacological interventions to manage fatigue among children with cancer. METHODS: Six electronic databases were screened first in February 2013 and at second instance in March 2015...
July 31, 2017: BMJ Supportive & Palliative Care
https://www.readbyqxmd.com/read/28720183/g-loc-warning-algorithms-based-on-emg-features-of-the-gastrocnemius-muscle
#19
Sungho Kim, Taehwan Cho, Yongkyun Lee, Hyojin Koo, Booyong Choi, Dongsoo Kim
BACKGROUND: G-induced loss of consciousness (G-LOC) is mainly caused by failure to sustain an oxygenated blood supply to the pilot's brain because of the sudden acceleration in the direction of the +Gz axis, and is considered a critical safety issue. The purpose of this study was to develop G-LOC warning algorithms based on monitoring electromyograms (EMG) of the gastrocnemius muscle on the calf. METHODS: EMG data was retrieved from a total of 67 pilots and pilot trainees of the Korean Air Force during high-G training on a human centrifugal simulator...
August 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28700603/the-language-of-glove-wireless-gesture-decoder-with-low-power-and-stretchable-hybrid-electronics
#20
Timothy F O'Connor, Matthew E Fach, Rachel Miller, Samuel E Root, Patrick P Mercier, Darren J Lipomi
This communication describes a glove capable of wirelessly translating the American Sign Language (ASL) alphabet into text displayable on a computer or smartphone. The key components of the device are strain sensors comprising a piezoresistive composite of carbon particles embedded in a fluoroelastomer. These sensors are integrated with a wearable electronic module consisting of digitizers, a microcontroller, and a Bluetooth radio. Finite-element analysis predicts a peak strain on the sensors of 5% when the knuckles are fully bent...
2017: PloS One
keyword
keyword
104271
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"