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Power duration relationship

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https://www.readbyqxmd.com/read/29320970/modelling-endurance-and-resumption-times-for-repetitive-one-hand-pushing
#1
Linda M Rose, Catherine A A Beauchemin, W Patrick Neumann
This study's objective was to develop models of endurance time (ET), as a function of load level (LL), and of resumption time (RT) after loading as a function of both LL and loading time (LT) for repeated loadings. Ten male participants with experience in construction work each performed fifteen different one-handed repetaed pushing tasks at shoulder height with varied exerted force and duration. This data was used to create regression models predicting ET and RT. It is concluded that power law relationships are most appropriate to use when modelling ET and RT...
January 11, 2018: Ergonomics
https://www.readbyqxmd.com/read/29289789/zoledronic-acid-increases-the-prevalence-of-medication-related-osteonecrosis-of-the-jaw-in-a-dose-dependent-manner-in-rice-rats-oryzomys-palustris-with-localized-periodontitis
#2
J G Messer, J L Mendieta Calle, J M Jiron, E J Castillo, C Van Poznak, N Bhattacharyya, D B Kimmel, J I Aguirre
OBJECTIVE: Investigate role of dose/duration of zoledronic acid (ZOL), a powerful anti-resorptive (pAR), on prevalence of medication-related osteonecrosis of the jaw (MRONJ) in rice rats (Oryzomys palustris), a species with natural susceptibility to food impaction-induced localized periodontitis (FILP). We hypothesize that ZOL induces MRONJ lesions in rice rats with FILP, and that the prevalence of MRONJ rises with increasing dose and duration of ZOL treatment. METHODS: We performed a toxicology experiment with clinically-relevant doses of ZOL in female rats (N=230) fed standard (STD) rodent chow...
December 28, 2017: Bone
https://www.readbyqxmd.com/read/29274745/neural-phase-locking-predicts-bold-response-in-human-auditory-cortex
#3
Hiroyuki Oya, Phillip E Gander, Christopher I Petkov, Ralph Adolphs, Kirill V Nourski, Hiroto Kawasaki, Matthew A Howard, Timothy D Griffiths
Natural environments elicit both phase-locked and non-phase-locked neural responses to the stimulus in the brain. The interpretation of the BOLD signal to date has been based on an association of the non-phase-locked power of high-frequency local field potentials (LFPs), or the related spiking activity in single neurons or groups of neurons. Previous studies have not examined the prediction of the BOLD signal by phase-locked responses. We examined the relationship between the BOLD response and LFPs in the same nine human subjects from multiple corresponding points in the auditory cortex, using amplitude modulated pure tone stimuli of a duration to allow an analysis of phase locking of the sustained time period without contamination from the onset response...
December 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/29244861/reliability-of-the-parameters-of-the-power-duration-relationship-using-maximal-effort-time-trials-under-laboratory-conditions
#4
Christoph Triska, Bettina Karsten, Bernd Heidegger, Bernhard Koller-Zeisler, Bernhard Prinz, Alfred Nimmerichter, Harald Tschan
The purpose of this study was to assess the reliability of critical power (CP) and the total amount of work accomplished above CP (W´) across repeated tests using ecologically valid maximal effort time-trials (TT) under laboratory conditions. After an initial incremental exercise test, ten well-trained male triathletes (age: 28.5 ± 4.7 years; body mass: 73.3 ± 7.9 kg; height: 1.80 ± 0.07 m; maximal aerobic power [MAP]: 329 ± 41 W) performed three testing sessions (Familiarization, Test I and Test II) each comprising three TT (12, 7, and 3 min with a passive recovery of 60 min between trials)...
2017: PloS One
https://www.readbyqxmd.com/read/29228820/associations-between-depressive-symptomatology-and-neurocognitive-impairment-in-hiv-aids
#5
Sarah Tymchuk, Daniela Gomez, Noshin Koenig, M John Gill, Esther Fujiwara, Christopher Power
OBJECTIVE: Mood disorders and neurocognitive impairments are debilitating conditions among patients with HIV/AIDS. How these comorbidities interact and their relationships to systemic factors remain uncertain. Herein, we investigated factors contributing to depressive symptomatology (DS) in a prospective cohort of patients with HIV/AIDS in active care that included neuropsychological assessment. METHODS: Among patients with HIV/AIDS receiving combination antiretroviral therapy (cART) and ongoing clinical assessments including measures of sleep, health-related quality of life (HQoL), neuropsychological testing, and mood evaluation (Patient Health Questionnaire-9 [PHQ-9]) were performed...
January 1, 2017: Canadian Journal of Psychiatry. Revue Canadienne de Psychiatrie
https://www.readbyqxmd.com/read/29201153/poor-glycaemic-control-is-associated-with-reduced-exercise-performance-and-oxygen-economy-during-cardio-pulmonary-exercise-testing-in-people-with-type-1-diabetes
#6
Othmar Moser, Max L Eckstein, Olivia McCarthy, Rachel Deere, Stephen C Bain, Hanne L Haahr, Eric Zijlstra, Richard M Bracken
Background: To explore the impact of glycaemic control (HbA1c) on functional capacity during cardio-pulmonary exercise testing in people with type 1 diabetes. Methods: Sixty-four individuals with type 1 diabetes (age: 34 ± 8 years; 13 females, HbA1c: 7.8 ± 1% (62 ± 13 mmol/mol), duration of diabetes: 17 ± 9 years) performed a cardio-pulmonary cycle ergometer exercise test until volitional exhaustion. Stepwise linear regression was used to explore relationships between HbA1c and cardio-respiratory data with p ≤ 0...
2017: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/29187725/mobbing-bullying-at-work-in-italy-characteristics-of-successful-court-cases
#7
Daniela Acquadro Maran, Silvia Bernardelli, Antonella Varetto
BACKGROUND: Mobbing (bullying at work) refers to a form of psychological harassment that occurs in the workplace, in which the victim must be systematically and continuously persecuted for a long period of time. The aim of this work is to analyze the court judgments related to mobbing. METHODS: The data, collected from a website that included judgments from an Italian court, were analyzed according to the literature, identifying the type of victims, consequences, methods of harassment, type of mobbers, and compensation decided by the court...
November 22, 2017: Journal of Injury & Violence Research
https://www.readbyqxmd.com/read/29180111/tactile-acuity-is-reduced-in-people-with-chronic-neck-pain
#8
Daniel S Harvie, Grace Edmond-Hank, Ashley D Smith
BACKGROUND: Tactile acuity deficits have been demonstrated in a range of persistent pain conditions and may reflect underlying cortical re-organisation. OBJECTIVE: This study aimed to determine whether tactile acuity is impaired in people with chronic neck pain relative to controls, and whether deficits relate to pain location, duration and intensity. METHODS: In this cross-sectional study, 20 people with chronic neck pain (5 idiopathic neck pain; 15 whiplash-associated disorder) and 20 pain-free controls underwent two-point discrimination (TPD) testing at the neck, back and arm, and point-to-point (PTP) and graphesthesia tests of tactile acuity at the neck and arm...
November 21, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/29177574/prevalence-of-psychological-disorders-sleep-disturbance-and-stressful-life-events-and-their-relationships-with-disease-parameters-in-chinese-patients-with-ankylosing-spondylitis
#9
Yutong Jiang, Mingcan Yang, Qing Lv, Jun Qi, Zhiming Lin, Zetao Liao, Yanli Zhang, Husheng Wu, Hui Song, Feng Zhan, Shengyun Liu, Guanmin Gao, Shaoxian Hu, Yinong Li, Lingxun Shen, Anbing Huang, Qiujing Wei, Shuangyan Cao, Jieruo Gu
Our aim was to investigate the prevalence of psychological disorders, sleep disturbance, and stressful life events in Chinese patients with ankylosing spondylitis (AS) and healthy controls, to assess the correlation between psychological and disease-related variables, and finally to detect powerful factors in predicting anxiety and depression. AS patients diagnosed with the modified New York criteria and healthy controls were enrolled from China. Participants completed a set of questionnaires, including demographic and disease parameters, Zung self-rating anxiety scale (SAS), Zung self-rating depression scale (SDS), the Pittsburgh Sleep Quality Index questionnaire (PSQI), and the Social Readjustment Rating Scale (SRRS)...
November 25, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/29152415/character-drawing-style-in-cartoons-on-empathy-induction-an-eye-tracking-and-eeg-study
#10
Yong-Il Lee, Yeojeong Choi, Jaeseung Jeong
In its most basic form, empathy refers to the ability to understand another person's feelings and emotions, representing an essential component of human social interaction. Owing to an increase in the use of mass media, which is used to distribute high levels of empathy-inducing content, media plays a key role in individual and social empathy induction. We investigated empathy induction in cartoons using eye movement, EEG and behavioral measures to explore whether empathy factors correlate with character drawing styles...
2017: PeerJ
https://www.readbyqxmd.com/read/29137748/a-novel-synthesis-of-a-new-thorium-iv-metal-organic-framework-nanostructure-with-well-controllable-procedure-through-ultrasound-assisted-reverse-micelle-method
#11
Ghasem Sargazi, Daryoush Afzali, Ali Mostafavi
Reverse micelle (RM) and ultrasound assisted reverse micelle (UARM) were applied to the synthesis of novel thorium nanostructures as metal organic frameworks (MOFs). Characterization with different techniques showed that the Th-MOF sample synthesized by UARM method had higher thermal stability (354°C), smaller mean particle size (27nm), and larger surface area (2.02×10(3)m(2)/g). Besides, in this novel approach, the nucleation of crystals was found to carry out in a shorter time. The synthesis parameters of UARM method were designed by 2(k-1) factorial and the process control was systematically studied using analysis of variance (ANOVA) and response surface methodology (RSM)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29131999/hydropower-impacts-on-reservoir-fish-populations-are-modified-by-environmental-variation
#12
Antti P Eloranta, Anders G Finstad, Ingeborg P Helland, Ola Ugedal, Michael Power
Global transition towards renewable energy production has increased the demand for new and more flexible hydropower operations. Before management and stakeholders can make informed choices on potential mitigations, it is essential to understand how the hydropower reservoir ecosystems respond to water level regulation (WLR) impacts that are likely modified by the reservoirs' abiotic and biotic characteristics. Yet, most reservoir studies have been case-specific, which hampers large-scale planning, evaluation and mitigation actions across various reservoir ecosystems...
November 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29124324/the-effect-of-mental-fatigue-on-critical-power-during-cycling-exercise
#13
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...
November 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29048012/generation-of-a-square-pulse-with-ultra-wide-tuning-range-in-a-passively-mode-locked-yb-doped-fiber-laser
#14
Yafei Cao, Dongfang Jia, Tonghui Liu, Tianxin Yang, Zhaoying Wang, Chunfeng Ge
We have experimentally demonstrated a square pulse in a passively mode-locked Yb-doped fiber ring laser operating in the dissipative soliton resonance (DSR) region based on the nonlinear polarization rotation technique. In our experiment, a 1.5-km long single-mode fiber (SMF) is inserted into the cavity to increase the cavity length. The total cavity is 1501.8 m. With increasing pump power, the pulse duration can be tuned from 209.8 ns to 812.4 ns without wave-breaking, and the maximum output single pulse energy is 42...
August 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29045317/the-relationships-between-height-arm-length-and-leg-length-on-the-mechanics-of-the-conventional-and-high-handle-hexagonal-bar-deadlift
#15
Robert G Lockie, Matthew R Moreno, Ashley J Orjalo, Adrina Lazar, Tricia M Liu, Alyssa A Stage, Samantha A Birmingham-Babauta, John J Stokes, Dominic V Giuliano, Fabrice G Risso, DeShaun L Davis, Samuel J Callaghan
The study investigated relationships between arm (AL) and leg length (LL) and conventional deadlift (CD) and high-handle hexagonal bar deadlift (HHBD) mechanics. Twenty-three resistance-trained subjects (14 males, 9 females) completed a one-repetition maximum (1RM) CD and HHBD. A linear position transducer was used to measure: lift distance and duration; peak and mean power, velocity, and force; time to peak power and velocity; and work. Right AL and LL were measured, and AL-to-LL ratio (AL:LL) was also calculated...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29041980/comparison-of-the-clinical-effectiveness-of-us-grading-scoring-system-vs-mri-in-the-diagnosis-of-early-rheumatoid-arthritis-ra
#16
Huajun Xu, Yingchun Zhang, Huimei Zhang, Caishan Wang, Pan Mao
BACKGROUND: As an irreversible disease, a treatment delay can negatively affect treatment response in rheumatoid arthritis (RA). Ultrasound and MRI have played an important role in assessing disease progression and response to treatment in RA for many years. The present study was designed to compare the diagnostic efficacy of ultrasound grading and MRI in early RA. METHODS: In this retrospective study, 62 early RA patients within 12 months of symptom onset were included...
October 17, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29018605/enhanced-conflict-monitoring-via-a-short-duration-video-assisted-deep-breathing-in-healthy-young-adults-an-event-related-potential-approach-through-the-go-nogo-paradigm
#17
Kok Suen Cheng, Yun Fah Chang, Ray P S Han, Poh Foong Lee
OBJECTIVES: Practitioners of mindfulness are reported to have greater cognitive control especially in conflict monitoring, response inhibition and sustained attention. However, due to the various existing methods in each mindfulness practices and also, the high commitment factor, a barrier still exists for an individual to pick up the practices. Therefore, the effect of short duration deep breathing on the cognitive control is investigated here. METHODS: Short duration guided deep breathing videos consisting of 5, 7 and 9 min respectively were created and used on subjects training...
2017: PeerJ
https://www.readbyqxmd.com/read/29016482/relationship-between-physical-performance-testing-results-and-peak-running-intensity-during-professional-rugby-league-match-play
#18
Grant M Duthie, Heidi R Thornton, Jace A Delaney, James T McMahon, Dean T Benton
The purpose of this study was to examine the relationship between individual athletes' physical characteristics and both the peak running intensities and the decline in peak running intensities during competition. Twenty-two professional rugby league athletes (age; 24.1 ± 4.0 years, body mass; 101.4 ± 9.5 kg) underwent a series of physical testing procedures. Peak running intensity was determined using a moving average technique, applied to the speed (m·min), acceleration/deceleration (m·s) and metabolic power (W·kg) during competition, across 10 different durations...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28969876/review-of-underactive-bladder
#19
REVIEW
Yi-Huei Chang, Justin Ji-Yuen Siu, Po-Jen Hsiao, Chao-Hsiang Chang, Eric Chieh-Lung Chou
In clinical practice, many patients cannot empty their bladders within an acceptable duration. Common complaints include weak urinary stream and incomplete emptying, which may affect quality of life. Bladder emptying requires sufficient detrusor contractile power, velocity, and durability. The urodynamic term for inadequate detrusor contraction is detrusor underactivity (DU). Although this definition was provided by the ICS, it may not be clinically practical. Analogous to the relationship between overactive bladder (OAB) and detrusor overactivity (DO), the symptom complex caused by DU is termed underactive bladder (UAB)...
September 29, 2017: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/28928757/development-of-a-critical-nitrogen-dilution-curve-based-on-leaf-area-duration-in-wheat
#20
Xiaolong Wang, Tianyang Ye, Syed Tahir Ata-Ul-Karim, Yan Zhu, Leilei Liu, Weixing Cao, Liang Tang
Precise quantification of plant nitrogen (N) nutrition status is essential for crop N management. The concept of critical N concentration (Nc) has been widely used for assessment of plant N status. This study aimed to develop a new winter wheat Nc dilution curve based on leaf area duration (LAD). Four field experiments were performed on different cultivars with different N fertilization modes in the Yangtze River basin and Yellow River basin in China. Results showed that the increase in LAD with increasing cumulative thermal time took the shape of an "S" type curve; whereas shoot N concentration decreased with increasing LAD, according to a power function...
2017: Frontiers in Plant Science
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