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Tracking Fatigue

Utku Kandemir, Safa Herfat, Mary Herzog, Paul Viscogliosi, Murat Pekmezci
OBJECTIVES: The goal of this study is to compare the fatigue strength of a locking intramedullary nail (LN) construct to a double locking plate (DLP) construct in comminuted proximal extra-articular tibia fractures. METHODS: Eight pairs of fresh frozen cadaveric tibias with low bone mineral density (Age: 80 ± 7 (SD) years, T-score: -2.3 ± 1.2) were used. One tibia from each pair was fixed with LN while the contralateral side was fixed with DLP for complex extra-articular multifragmentary, metaphyseal fractures (simulating OTA41-A3...
October 7, 2016: Journal of Orthopaedic Trauma
Wolfgang Fuhl, Thiago Santini, Carsten Reichert, Daniel Claus, Alois Herkommer, Hamed Bahmani, Katharina Rifai, Siegfried Wahl, Enkelejda Kasneci
Modern microsurgery is a long and complex task requiring the surgeon to handle multiple microscope controls while performing the surgery. Eye tracking provides an additional means of interaction for the surgeon that could be used to alleviate this situation, diminishing surgeon fatigue and surgery time, thus decreasing risks of infection and human error. In this paper, we introduce a novel algorithm for pupil detection tailored for eye images acquired through an unmodified microscope ocular. The proposed approach, the Hough transform, and six state-of-the-art pupil detection algorithms were evaluated on over 4000 hand-labeled images acquired from a digital operating microscope with a non-intrusive monitoring system for the surgeon eyes integrated...
October 7, 2016: Computers in Biology and Medicine
Stephanie A Kolakowsky-Hayner, Kimberly Bellon, Ketra Toda, Tamara Bushnik, Jerry Wright, Linda Isaac, Jeffrey Englander
Fatigue is one of the most commonly reported sequelae after traumatic brain injury (TBI). This study evaluated the impact of a graduated physical activity programme on fatigue after TBI. Using a prospective randomised single-blind crossover design, 123 individuals with TBI, over the age of 18, were enrolled. Interventions included a home-based walking programme utilising a pedometer to track daily number of steps at increasing increments accompanied by tapered coaching calls over a 12-week period. Nutritional counselling with the same schedule of coaching calls served as the control condition...
October 13, 2016: Neuropsychological Rehabilitation
Carolina A Moreira, John P Bilezikian
CONTEXT: Stress fractures are repetitive use injuries in which recurrent strains lead to material fatigue and microarchitectural discontinuities. Stress fractures account for up to 20% of athletic injuries, more commonly sustained by women and in those who engage in track-and-field events. The pathogenesis of stress fractures is multifactorial. Although most stress fracture are reported among women who may experience menstrual disturbances, low body mass index, low energy intake and sometimes low bone mass, these individuals do not regularly seek endocrinological attention...
October 12, 2016: Journal of Clinical Endocrinology and Metabolism
Zizheng Guo, Ruiya Chen, Kan Zhang, Yirun Pan, Jianhui Wu
The impairing effects of mental fatigue on visual sustained attention were assessed by event-related potentials (ERPs). Subjects performed a dual visual task, which includes a continuous tracking task (primary task) and a random signal detection task (secondary task), for 63 minutes nonstop in order to elicit ERPs. In this period, the data such as subjective levels of mental fatigue, behavioral performance measures, and electroencephalograms were recorded for each subject. Comparing data from the first interval (0-25 min) to that of the second, the following phenomena were observed: the subjective fatigue ratings increased with time, which indicates that performing the tasks leads to increase in mental fatigue levels; reaction times prolonged and accuracy rates decreased in the second interval, which indicates that subjects' sustained attention decreased...
2016: PloS One
Jørgen Riis Jepsen, Hanna B Rasmussen
BACKGROUND: The metabolic syndrome (MS) represents a cluster of risk factors related to insulin resistance. Metabolic syndrome is a strong risk factor for chronic metabolic and cardiovascular diseases and is related to nutritional factors, sleep patterns, work-related stress, fatigue, and physical activity - all of which are critical issues at sea. We have previously demonstrated a MS prevalence of 24.2% in Danish seafarers. This study aimed to follow the trend of MS after 2 years' intervention...
2016: International Maritime Health
João Gustavo Claudino, John Cronin, Bruno Mezêncio, Daniel Travis McMaster, Michael McGuigan, Valmor Tricoli, Alberto Carlos Amadio, Julio Cerca Serrão
OBJECTIVES: The primary objective of this meta-analysis was to compare countermovement jump (CMJ) performance in studies that reported the highest value as opposed to average value for the purposes of monitoring neuromuscular status (i.e., fatigue and supercompensation). The secondary aim was to determine the sensitivity of the dependent variables. DESIGN: Systematic review with meta-analysis. METHODS: The meta-analysis was conducted on the highest or average of a number of CMJ variables...
August 25, 2016: Journal of Science and Medicine in Sport
Micha Mm Wilhelmus, Justin L Hay, Rob Gja Zuiker, Pieter Okkerse, Christelle Perdrieu, Julien Sauser, Maurice Beaumont, Jeroen Schmitt, Joop Ma van Gerven, Beata Y Silber
Caffeine induces positive effects on sustained attention, although studies assessing the acute effects of low caffeine dose (<75 mg) on sustained attention are limited and use short-term tests. Therefore, we investigated the acute effects of a 60 mg dose of caffeine on sustained attention in tests lasting up to 45 minutes using 82 low or non-caffeine-consuming healthy male (n=41) and female (n=41) adults aged between 40 and 60 years. Vigilance was measured using Mackworth Clock test, Rapid Visual Information Processing Test, adaptive tracking test, saccadic eye movement and attention switch test...
September 20, 2016: Journal of Psychopharmacology
Evan L Ardiel, Andrew C Giles, Alex J Yu, Theodore H Lindsay, Shawn R Lockery, Catharine H Rankin
Habituation is a highly conserved phenomenon that remains poorly understood at the molecular level. Invertebrate model systems, like Caenorhabditis elegans, can be a powerful tool for investigating this fundamental process. Here we established a high-throughput learning assay that used real-time computer vision software for behavioral tracking and optogenetics for stimulation of the C. elegans polymodal nociceptor, ASH. Photoactivation of ASH with ChR2 elicited backward locomotion and repetitive stimulation altered aspects of the response in a manner consistent with habituation...
October 2016: Learning & Memory
Jean-François Brunet, Dominique Dagenais, Marc Therrien, Daniel Gartenberg, Geneviève Forest
Despite its high sensitivity and validity in the context of sleep loss, the Psychomotor Vigilance Test (PVT) could be improved. The aim of the present study was to validate a new smartphone PVT-type application called sleep-2-Peak (s2P) by determining its ability to assess fatigue-related changes in alertness in a context of extended wakefulness. Short 3-min versions of s2P and of the classic PVT were administered at every even hour during a 35-h total sleep deprivation protocol. In addition, subjective measures of sleepiness were collected...
September 8, 2016: Behavior Research Methods
Susan L Murphy, Anna L Kratz, Stacey L Schepens Niemiec
BACKGROUND: Fatigue in older adults is associated with functional decline and reduced participation in daily life; however, it is not well characterized. Examining fatigue within activity performance, or "fatigability," is a recommended approach to begin to understand fatigue and its underlying mechanisms. This study examined the construct validity of lab-based measures of fatigability and compared these measures with fatigability in daily life (termed ecological fatigability). METHODS: Participants with osteoarthritis and fatigue (n = 163) underwent laboratory assessments, completed questionnaires, and wore accelerometers for 7 days while tracking symptoms and behaviors...
August 29, 2016: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
(no author information available yet)
Reports an error in "Shifts in attention during mental fatigue: Evidence from subjective, behavioral, physiological, and eye-tracking data" by Jesper F. Hopstaken, Dimitri van der Linden, Arnold B. Bakker, Michiel A. J. Kompier and Yik Kiu Leung (, 2016[Jun], Vol 42[6], 878-889). In the article, there were formatting errors in columns 1 through 8 of Table 2. The correct table is present in the erratum. (The following abstract of the original article appeared in record .) There is an increasing amount of evidence that during mental fatigue, shifts in motivation drive performance rather than reductions in finite mental energy...
September 2016: Journal of Experimental Psychology. Human Perception and Performance
Donna P Phillips, Joseph D Zuckerman, Adina Kalet, Kenneth A Egol
The Accreditation Council of Graduate Medical Education requires that residency programs teach and assess trainees in six core competencies. Assessments are imperative to determine trainee competence and to ensure that excellent care is provided to all patients. A structured, direct observation program is feasible for assessing nontechnical core competencies and providing trainees with immediate constructive feedback. Direct observation of residents in the outpatient setting by trained faculty allows assessment of each core competency...
September 2016: Journal of the American Academy of Orthopaedic Surgeons
Thibault Taillandier-Thomas, Stéphane Roux, François Hild
Based on the assumption that the time evolution of a sample observed by computed tomography requires many less parameters than the definition of the microstructure itself, it is proposed to reconstruct these changes based on the initial state (using computed tomography) and very few radiographs acquired at fixed intervals of time. This Letter presents a proof of concept that for a fatigue cracked sample its kinematics can be tracked from no more than two radiographs in situations where a complete 3D view would require several hundreds of radiographs...
July 8, 2016: Physical Review Letters
Toshiyuki Ohya, Ryo Yamanaka, Masahiro Hagiwara, Marie Oriishi, Yasuhiro Suzuki
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
M Flethøj, C C Schwarzwald, M M Haugaard, H Carstensen, J K Kanters, L H Olsen, R Buhl
BACKGROUND: Prolonged exercise in human athletes is associated with transient impairment of left ventricular (LV) function, known as cardiac fatigue. Cardiac effects of prolonged exercise in horses remain unknown. OBJECTIVES: To investigate the effects of prolonged exercise on LV systolic and diastolic function in horses. ANIMALS: Twenty-six horses competing in 120-160 km endurance rides. METHODS: Cross-sectional field study...
July 2016: Journal of Veterinary Internal Medicine
Joel T Fuller, Clint R Bellenger, Dominic Thewlis, John Arnold, Rebecca L Thomson, Margarita D Tsiros, Eileen Y Robertson, Jonathan D Buckley
PURPOSE: Stride-to-stride fluctuations in running stride interval display long-range correlations that breakdown in the presence of fatigue accumulated during an exhaustive run. The purpose of our study was to investigate whether long-range correlations in running stride interval were reduced by fatigue accumulated during prolonged exposure to a high training load (functional overreaching) and were associated with decrements in performance caused by functional overreaching. METHODS: Ten trained male runners completed 7-days of light training (LT7), 14-days of heavy training (HT14) designed to induce a state of functional overreaching and 10-days of light training (LT10) in a fixed order...
June 13, 2016: International Journal of Sports Physiology and Performance
Brianna L Cowling, Brad Harwood, David B Copithorne, Charles L Rice
Investigations of high-intensity isometric fatiguing protocols report decreases in motor unit firing rates (MUFRs), but little is known regarding changes in MUFRs following fatigue induced by high-intensity dynamic contractions. Our purpose was to evaluate MUFRs of the anconeus (an accessory elbow extensor) and elbow extension power production as a function of time to task failure (TTF) during high-velocity fatiguing concentric contractions against a moderately heavy resistance. Fine-wire intramuscular electrode pairs were inserted into the anconeus to record MUs in 12 male participants (25 ± 3 yr), over repeated sessions on separate days...
August 1, 2016: Journal of Applied Physiology
Daisuke Ishigaki, Hidenobu Okuyama, Koichi Yuki, Yoko Sato, Naomi Ogawa, Osamu Hirono, Isao Kubota
A 78-year-old woman was referred to our hospital because of general fatigue. The electrocardiogram showed ST elevation in the I, II, aVL, and V2-V6 leads. Echocardiography showed left ventricular apical akinesis. On emergent cardiac catheterization, left ventricular basal hyperkinesis and apical akinesis without coronary artery stenosis were found. The patient was diagnosed with Takotsubo cardiomyopathy. Two-dimensional myocardial speckle tracking echocardiography was performed on admission, the 8th hospital day, and the 15th hospital day...
October 2012: Journal of Medical Ultrasonics
Andrew A Flatt, Michael R Esco, Fabio Y Nakamura
The purpose of this study was to track changes in training load (TL) and recovery status indicators throughout a 2-week preseason and to interpret the meaning of these changes on an individual basis among 8 Division-1 female soccer players. Weekly averages for heart rate variability (lnRMSSD), TL and psychometrics were compared with effect sizes (ES) and magnitude based inferences. Relationships were determined with Pearson correlations. Group analysis showed a very likely moderate decrease for total training load (TTL) (TTL week 1 = 1203 ± 198, TTL week 2 = 977 ± 288; proportion = 1/2/97, ES = -0...
May 23, 2016: Journal of Strength and Conditioning Research
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