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Power duration relationship

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https://www.readbyqxmd.com/read/27918961/the-promise-of-subtraction-ictal-spect-co-registered-to-mri-for-improved-seizure-localization-in-pediatric-epilepsies-affecting-factors-and-relationship-to-the-surgical-outcome
#1
Catherine Stamoulis, Nishant Verma, Himanshu Kaulas, Jonathan J Halford, Frank H Duffy, Phillip L Pearl, S Ted Treves
OBJECTIVE: Ictal SPECT is promising for accurate non-invasive localization of the epileptogenic brain tissue in focal epilepsies. However, high quality ictal scans require meticulous attention to the seizure onset. In a relatively large cohort of pediatric patients, this study investigated the impact of the timing of radiotracer injection, MRI findings and seizure characteristics on ictal SPECT localizations, and the relationship between concordance of ictal SPECT, scalp EEG and resected area with seizure freedom following epilepsy surgery...
November 30, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27918663/comparison-of-critical-power-and-w-derived-from-two-or-three-maximal-tests
#2
Len Parker Simpson, Mehdi Kordi
PURPOSE: Typically, accessing the asymptote (Critical Power; CP) and curvature constant (W') parameters of the hyperbolic power-duration relationship requires multiple constant-power, exhaustive exercise trials, spread over several visits. However, more recently single-visit protocols and personal power meters have been used. We investigated the practicality of using a two-trial, single-visit protocol in providing reliable CP & W' estimates. METHODS: 8 trained cyclists underwent 3- and 12-min maximal exercise trials in a single session to derive (2-trial) CP & W' estimates...
December 5, 2016: International Journal of Sports Physiology and Performance
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
#3
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/27806677/power-duration-relationship-physiology-fatigue-and-the-limits-of-human-performance
#4
Mark Burnley, Andrew M Jones
The duration that exercise can be maintained decreases as the power requirements increase. In this review, we describe the power-duration (PD) relationship across the full range of attainable power outputs in humans. We show that a remarkably small range of power outputs is sustainable (power outputs below the critical power, CP). We also show that the origin of neuromuscular fatigue differs considerably depending on the exercise intensity domain in which exercise is performed. In the moderate domain (below the lactate threshold, LT), fatigue develops slowly and is predominantly of central origin (residing in the central nervous system)...
November 3, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27802372/preserving-self-medication-taking-practices-and-preferences-of-older-adults-with-multiple-chronic-medical-conditions
#5
Roxanne Vandermause, Joshua J Neumiller, Brian J Gates, Prabu David, Molly Altman, Daniel J Healey, Patricia Benson, Duane Sunwold, Gail Burton, Katherine R Tuttle, Cynthia F Corbett
PURPOSE: To examine the experiences of older adults with multiple chronic medical conditions when a new medication was added to their existing multiple medication regimen. DESIGN: A multimethod qualitative design was used. Thirty adults 60 years of age with (a) at least three chronic medical diagnoses, (b) at least five medications at baseline, and (c) a new medication prescription were enrolled in a prospective study of 30 days duration, participating from their homes...
November 2016: Journal of Nursing Scholarship
https://www.readbyqxmd.com/read/27787608/the-constant-work-rate-critical-power-protocol-overestimates-ramp-incremental-exercise-performance
#6
Matthew I Black, Andrew M Jones, James A Kelly, Stephen J Bailey, Anni Vanhatalo
PURPOSE: The parameters of the power-duration relationship (i.e., the critical power, CP, and the curvature constant, W') may theoretically predict maximal performance capability for exercise above the CP. The CP and W' are associated with the parameters of oxygen uptake ([Formula: see text]O2) kinetics, which can be altered by manipulation of the work-rate forcing function. We tested the hypothesis that the CP and W' derived from constant work-rate (CWR) prediction trials would overestimate ramp incremental exercise performance...
October 27, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27735982/temporal-organization-of-stride-duration-variability-as-a-marker-of-gait-instability-in-parkinson-s-disease
#7
Thibault Warlop, Christine Detrembleur, Benjamin Bollens, Gaëtan Stoquart, Frédéric Crevecoeur, Anne Jeanjean, Thierry M Lejeune
OBJECTIVE: Gait instability and fall risk are major concerns in Parkinson's disease. This study shows that the temporal organization of gait variability can represent a marker of gait instability that complements standard assessment of motor deficits in Parkinson's disease. METHODS: Temporal organization (long-range autocorrelation; LRA) of stride duration variability, collected from 20 persons with Parkinson's disease walking overground at a comfortable speed, was studied...
November 11, 2016: Journal of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27730072/study-of-vitamin-b12-deficiency-and-peripheral-neuropathy-in-metformin-treated-early-type-2-diabetes-mellitus
#8
Rudra Prasad Roy, Kaushik Ghosh, Manas Ghosh, Amitava Acharyya, Ambarish Bhattacharya, Mrinal Pal, Sisir Chakraborty, Nilanjan Sengupta
BACKGROUND: Long-term therapy with metformin was shown to decrease the Vitamin B12 level and manifested as peripheral neuropathy. AIM: The aim of this study is to define the prevalence of Vitamin B12 deficiency in early Type 2 diabetic patients (duration ≤5 years or drug treatment ≤3 years) and the relationship among metformin exposure and levels of cobalamin (Cbl), folic acid, and homocysteine (Hcy) with severity of peripheral neuropathy. METHODOLOGY: This is a cross-sectional study involving randomly selected ninety patients (male 56, female 34) between age groups of 35 and 70 years, comparing those who had received >6 months of metformin (Group A) (n = 35) with those without metformin (Group B) (n = 35) and patients taking metformin with other oral hypoglycemic agent (Group C) (n = 20)...
September 2016: Indian Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27703445/asking-new-questions-with-old-data-the-centralized-open-access-rehabilitation-database-for-stroke
#9
Keith R Lohse, Sydney Y Schaefer, Adam C Raikes, Lara A Boyd, Catherine E Lang
BACKGROUND: This paper introduces a tool for streamlining data integration in rehabilitation science, the Centralized Open-Access Rehabilitation database for Stroke (SCOAR), which allows researchers to quickly visualize relationships among variables, efficiently share data, generate hypotheses, and enhance clinical trial design. METHODS: Bibliographic databases were searched according to inclusion criteria leaving 2,892 titles that were further screened to 514 manuscripts to be screened by full text, leaving 215 randomized controlled trials (RCTs) in the database (489 independent groups representing 12,847 patients)...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27688431/w-expenditure-and-reconstitution-during-severe-intensity-constant-power-exercise-mechanistic-insight-into-the-determinants-of-w
#10
Ryan M Broxterman, Phillip F Skiba, Jesse C Craig, Samuel L Wilcox, Carl J Ade, Thomas J Barstow
The sustainable duration of severe intensity exercise is well-predicted by critical power (CP) and the curvature constant (W'). The development of the W'BAL model allows for the pattern of W' expenditure and reconstitution to be characterized and this model has been applied to intermittent exercise protocols. The purpose of this investigation was to assess the influence of relaxation phase duration and exercise intensity on W' reconstitution during dynamic constant power severe intensity exercise. Six men (24...
October 2016: Physiological Reports
https://www.readbyqxmd.com/read/27677914/effect-of-glycemic-index-of-a-pre-exercise-meal-on-endurance-exercise-performance-a-systematic-review-and-meta-analysis
#11
Catriona A Burdon, Inge Spronk, Hoi Lun Cheng, Helen T O'Connor
BACKGROUND: Low glycemic index (GI) pre-exercise meals may enhance endurance performance by maintaining euglycemia and altering fuel utilization. However, evidence for performance benefits is equivocal. OBJECTIVE: To evaluate the effect of a low GI (LGI) versus a high GI (HGI) pre-exercise meal on endurance performance using meta-analyses. METHODS: Data sources included MEDLINE, SPORTDiscus, AUSPORT, AusportMed, Web of Science, and Scopus...
September 28, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27637608/severity-scoring-of-manganese-health-effects-for-categorical-regression
#12
Donald R Mattison, Brittany Milton, Daniel Krewski, Len Levy, David C Dorman, Peter J Aggett, Harry A Roels, Melvin E Andersen, Nataliya A Karyakina, Natalia Shilnikova, Siva Ramoju, Doreen McGough
Characterizing the U-shaped exposure response relationship for manganese (Mn) is necessary for estimating the risk of adverse health from Mn toxicity due to excess or deficiency. Categorical regression has emerged as a powerful tool for exposure-response analysis because of its ability to synthesize relevant information across multiple studies and species into a single integrated analysis of all relevant data. This paper documents the development of a database on Mn toxicity designed to support the application of categorical regression techniques...
September 13, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27625755/comparison-of-mental-toughness-and-power-test-performances-in-high-level-kickboxers-by-competitive-success
#13
Maamer Slimani, Bianca Miarka, Walid Briki, Foued Cheour
BACKGROUND: Kickboxing is a high-intensity intermittent striking combat sport, which is characterized by complex skills and tactical key actions with short duration. OBJECTIVES: The present study compared and verified the relationship between mental toughness (MT), countermovement jump (CMJ) and medicine ball throw (MBT) power tests by outcomes of high-level kickboxers during National Championship. MATERIALS AND METHODS: Thirty two high-level male kickboxers (winner = 16 and loser = 16: 21...
June 2016: Asian Journal of Sports Medicine
https://www.readbyqxmd.com/read/27585632/skin-autofluorescence-predicts-cardio-renal-outcome-in-type-1-diabetes-a-longitudinal-study
#14
Fritz-Line Vélayoudom-Céphise, Kalina Rajaobelina, Catherine Helmer, Sovanndany Nov, Emilie Pupier, Laurence Blanco, Marie Hugo, Blandine Farges, Cyril Astrugue, Henri Gin, Vincent Rigalleau
BACKGROUND: We aimed to analyze the relationships between skin autofluorescence (SAF) and incident macrovascular events and renal impairment after 4 years of follow-up in patients with type 1 diabetes (T1D). METHODS: Two hundred and forty-three patients (51.2 ± 16.7 years old) with T1D participated. SAF was measured by AGE-Reader-TM at inclusion. Macrovascular events (MVE), estimated glomerular filtration rate (eGFR) and urinary albumin excretion rate (AER) were recorded then and 4 years later...
2016: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/27532143/the-effectiveness-of-mindful-parenting-programs-in-promoting-parents-and-children-s-wellbeing-a-systematic-review
#15
Kishani Townshend, Zoe Jordan, Matthew Stephenson, Komla Tsey
BACKGROUND: The rationale for undertaking this review was to investigate a potential strategy to address the rising prevalence of child and adolescent mental health disorders. The central tenants of mindful parenting appear to be emotional awareness, emotional regulation, attention regulation, intentionality and non-judgmental acceptance. OBJECTIVES: The primary objective of this review was to systematically evaluate the effectiveness of mindful parenting programs in promoting children's, adolescents' and parents' wellbeing, particularly in relation to the intensity of symptoms associated with internalizing (depression, anxiety, stress) and externalizing (conduct) disorders...
March 2016: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/27502001/natriuretic-peptide-levels-taken-following-unplanned-admission-to-a-cardiology-department-predict-the-duration-of-hospitalization
#16
Marte Asphaug, Øyvind Skadberg, Ingvild Dalen, Kenneth Dickstein
AIMS: Natriuretic peptide (NP) levels are routinely employed as useful diagnostic and prognostic tools in the evaluation of patients with heart failure (HF). As hospitalization is the major consumer of healthcare resources, the prognostic power of admission NPs with regard to the duration of hospitalization deserves further investigation. METHODS AND RESULTS: We assessed retrospectively the association between NP values sampled shortly following unplanned admission and the duration of hospitalization in 2978 patients admitted to a cardiology department...
December 2016: European Journal of Heart Failure
https://www.readbyqxmd.com/read/27475538/unwanted-sexual-attention-at-work-and-long-term-sickness-absence-a-follow-up-register-based-study
#17
Annie Hogh, Paul Maurice Conway, Thomas Clausen, Ida Elisabeth Huitfeldt Madsen, Hermann Burr
BACKGROUND: The current understanding of the relationship between unwanted sexual attention at work and long-term sickness absence (LTSA) is limited for three reasons: 1) the under-researched role of unwanted sexual attention perpetrated by individuals outside the work organization; 2) a widespread use of self-reported measures of sickness absence, with an unclear identification of sickness absence episodes of long duration; 3) the cross-sectional design of most existing studies. The aim of this study was therefore to investigate the relationship between self-reported unwanted sexual attention at work and subsequent LTSA (≥3 weeks), stratifying by gender and source of exposure (i...
2016: BMC Public Health
https://www.readbyqxmd.com/read/27439061/glycosaminoglycan-chemical-exchange-saturation-transfer-in-human-lumbar-intervertebral-discs-effect-of-saturation-pulse-and-relationship-with-low-back-pain
#18
Tatsuhiro Wada, Osamu Togao, Chiaki Tokunaga, Ryohei Funatsu, Yasuo Yamashita, Kouji Kobayashi, Yasuhiko Nakamura, Hiroshi Honda
PURPOSE: To evaluate the dependence of saturation pulse power and duration on glycosaminoglycan chemical exchange saturation transfer (gagCEST) imaging and assess the degeneration of human lumbar intervertebral discs (IVDs) using this method. MATERIALS AND METHODS: All images were acquired on a 3T magnetic resonance imaging (MRI) scanner. The CEST effects were measured in the glycosaminoglycan (GAG) phantoms with different concentrations. In the human study, CEST effects were measured in the nucleus pulposus of IVD...
July 20, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27436859/the-cycle-of-abuse-when-victims-become-offenders
#19
Malory Plummer, Annie Cossins
Various psychological theories exist in the literature to explain the behavior of men who commit child sex offences, including the belief that child sexual abuse (CSA) is a predisposing factor for the transition from victim to offender. These theories are, however, unable to explain the fact that while most victims of CSA are female, most perpetrators of CSA are male. The sex specificity of CSA in terms of victims and offenders suggests that the experience of CSA and its psychosocial effects may be different for boys, compared to girls...
July 19, 2016: Trauma, Violence & Abuse
https://www.readbyqxmd.com/read/27426961/life-history-trait-plasticity-and-its-relationships-with-plant-adaptation-and-insect-fitness-a-case-study-on-the-aphid-sitobion-avenae
#20
Peng Dai, Xiaoqin Shi, Deguang Liu, Zhaohong Ge, Da Wang, Xinjia Dai, Zhihao Yi, Xiuxiang Meng
Phenotypic plasticity has recently been considered a powerful means of adaptation, but its relationships with corresponding life-history characters and plant specialization levels of insects have been controversial. To address the issues, Sitobion avenae clones from three plants in two areas were compared. Varying amounts of life-history trait plasticity were found among S. avenae clones on barley, oat and wheat. In most cases, developmental durations and their corresponding plasticities were found to be independent, and fecundities and their plasticities were correlated characters instead...
2016: Scientific Reports
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