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Query: UMLS:C0015672 (fatigue)
 51,768 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In many industries workers perform manual assembly tasks with hands postured above the shoulders. Awkward shoulder and arm postures are often viewed as acceptable given costs of workplace modification, postural exertions which are in compliance with current design recommendations, ready availability of strong workers, and numbers of electromyographic studies which fail to detect significant signs of localized muscle fatigue (LMF). An experiment was conducted to: (a) study the onset and severity of (LMF) in the shoulder when performing a stylus-to-hole Fitts reciprocal movement task under a range of postures, hand loads, ratios of work-to-rest, and task durations, and (b) to evaluate the efficacy of three techniques (i.e., changes in EMG behaviour, postural tremor, and cross-modal matching estimates) in detecting and monitoring posturally-based LMF and discomfort in the shoulder complex. Experimental findings showed that posturing hands above shoulder level significantly increased the risk of LMF and postural discomfort even in light-weight manual assembly environs where postural exertions are small, and that cross-modal matching estimates and postural tremor were more sensitive metrics of LMF in the shoulder complex than EMG RMS voltage and mean spectral power frequency metrics. The basis for experimental findings, as well as potential application of LMF metrics in future postural stress investigations, are discussed. Recommendations for workplace posture are provided for job designers facing work height decisions in manual assembly environs.
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PMID:Shoulder posture and localized muscle fatigue and discomfort. 271 48

The purpose of this study was to determine the effect of syndesmotic screw fixation on ankle motion. Eight unpaired osteoligamentous cadaver ankles were tested. The study quantified ankle flexion, talar tilt, ankle drawer, and tibiotalar rotation for each specimen using an MTS biomechanical testing system. Each specimen was tested under a 15-kg and a 70-kg axial load. The testing was repeated after the placement of a syndesmotic screw, a 4.5-mm cortical screw, in accordance with AO technique. There was a statistically significant decrease (P less than .05) in tibiotalar external rotation. There was no statistical difference in ankle flexion. There was a significant decrease in the anterior and the posterior drawer tests with the foot in plantar flexion. These were the most significant results. Syndesmotic screw fixation is used for the internal fixation of certain unstable ankle fractures. Opinions differ as to whether the screw should be removed at 6 weeks (prior to weightbearing) or left in place indefinitely. It was concluded that the syndesmotic screw should be removed prior to the return to full activity. Leaving it in place will contribute to abnormal ankle motion; this may result in local discomfort and a possible fatigue fracture of the screw.
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PMID:Effect of the syndesmotic screw on ankle motion. 276 62

A modified version of the McCorkle & Young Symptom Distress Scale, based on a linear analogue self-assessment scoring system, was used to assess symptom distress in a heterogeneous sample of 53 cancer patients. The scale was simultaneously completed by the nurses caring for those patients, who were asked to rate the patient according to how they perceived he was feeling with regard to each particular symptom. The scores were compared for congruency. This preliminary study suggests that, although nurses appear able to estimate the degree of distress due to changes in mobility and appearance or the presence of diarrhoea, constipation and tiredness, they are less effective in perceiving the degree of distress due to the less 'visible' symptoms such as pain, nausea, anorexia, sleeping disturbances, concentration and mood. Perhaps surprisingly, the trend was for nurses to overestimate the degree of distress when this was compared with the patients' self-assessment.
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PMID:Patients' and nurses' perceptions of symptom distress in cancer. 280 38

Sixty-eight medical, social, and occupational history variables were analyzed in a general population of 442 men and 478 women, aged 30, 40, 50, and 60 years to identify possible indicators for first-time experience and recurrence or persistence of low-back trouble (LBT) during a 1-year follow-up. Variables that in univariate analyses showed statistically significant indications for future LBT were subjected to stepwise logistic regression analyses. The most important indicators for recurrence or persistence of LBT thus identified were, for men, intermittent claudication, restlessness, or other discomfort in the lower limbs, frequent headache, and living alone. For women, the corresponding indicators were rumbling of "the stomach" and feeling of fatigue. For first-time experience of LBT, the indicators identified by the regression analyses were frequent pain in the top of the stomach, previous hospitalizations and operations, daily smoking, and a long distance from home to work. The result suggests that the population likely to experience future LBT does not enjoy good general health even prior to its first LBT episode, and this, in turn, may be due to greater psychosocial pressure.
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PMID:Medical, social and occupational history as risk indicators for low-back trouble in a general population. 294 36

We have conducted a Phase I and pharmacological study of flavone acetic acid, one of a series of novel flavonoids. The drug was administered i.v. weekly for 4 weeks, with a 2-week rest and then repeated. Flavone acetic acid was given initially in a 1-h infusion, but at the 3900-mg/m2 dose level, the infusion time was lengthened to 3 h. A total of 31 patients were treated with 9 different dose levels, ranging from 330 to 6400 mg/m2. Dose-limiting toxicity was acute hypotension that began after about one-third of each drug dose had been infused and rarely lasted more than a few minutes after the infusion was discontinued. In addition, subjective fatigue and asthenia causing unacceptable patient discomfort was dose limiting. A significant side effect noted that was not dose limiting was diarrhea during the infusion. This drug exhibited nonlinear pharmacokinetic behavior. Plasma levels exceeded 300 micrograms/ml during the infusion at the maximally tolerated dose. After the infusion ended the principal half-life was about 2 h. In 24-h urine collections 27% of the flavone acetic acid dose was recovered as intact drug and an additional 37% was recovered as a metabolite. The maximally tolerated dose determined in this study is 6400 mg/m2 given i.v. over 3 h.
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PMID:Phase I and clinical pharmacology study of intravenous flavone acetic acid (NSC 347512). 316 43

Knee extensor fatigue and endurance during repeated maximum isokinetic manoeuvres were studied in five sprinters and five marathon runners, all males. Fatigue and endurance were expressed in terms of output (contractional work, CW) and input (integrated electromyograms, iEMG), and was related to muscle fibre composition of m. vastus lateralis and to cross-sectional area (CSA) of m. quadriceps. The initially performed contractional work was positively related to the calculated absolute type II fibre area of m. vastus lateralis, but not to the cross-sectional area of m. quadriceps. During the first 25 contractions, sprinters fatigued, with a slope of decline in contractional work that was correlated to the absolute type II fibre area, also after correction of performed work for CSA of m. quadriceps. As the electromyographic activity decreased less than the contractional work, a drastic fall in the CW/iEMG ratio was found in the sprinter group. Three out of five sprinters could perform less than 50 knee extensions, due to subjective discomfort in tested thighs. In contrast, all marathon runners could, after a minor similar decline in electromyographic activity and contractional work during the first part of the experiment, maintain a steady-state endurance level of CW and iEMG throughout the test (200 knee extensions). In conclusion, fatigue during isokinetic maximal knee extensions is closely related to the muscle structure of m. vastus lateralis.
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PMID:Fatigue during dynamic muscle contractions in male sprinters and marathon runners: relationships between performance, electromyographic activity, muscle cross-sectional area and morphology. 322 91

The syndrome variously called Da Costa's syndrome, effort syndrome, neurocirculatory asthenia, etc has been studied for more than 100 years by many distinguished physicians. Originally identified in men in wartime, it has been widely recognised as a common chronic condition in both sexes in civilian life. Although the symptoms may seem to appear after infections and various physical and psychological stresses, neurocirculatory asthenia is most often encountered as a familial disorder that is unrelated to these factors, although they may aggravate an existing tendency. Respiratory complaints (including breathlessness, with and without effort, and smothering sensations) are almost universal, and palpitation, chest discomfort, dizziness and faintness, and fatigue are common. The physical examination is normal. The aetiology is obscure but patients usually have a normal life span. Reassurance and measures to improve physical fitness are helpful.
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PMID:Da Costa's syndrome or neurocirculatory asthenia. 331 50

The concept of 'quality of life' has had a paradigmatic effect in psychosomatic medicine by focussing on the measurements of psychological distress. This concept has been phenomenologically described under such names as discomfort and psychological boredom. Elements of fatigue, anxiety and depression seem to be core symptoms of dysfunctions in quality of life. An objective and nomothetic approach to quality of life has been demonstrated in this review when referring to the instrumental use of rating scales, e.g. the General Health Questionnaire. Furthermore, it has been recommended to follow the multiaxial approach of DSM-III including dimensions of personality, psychosocial stressors and social functioning.
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PMID:Quality of life in psychosomatic research. A psychometric model. 332 35

The lighting conditions, luminance, contrast, and design of the workplace were studied in video display terminal (VDT) work stations operated by a group of female VDT data-acquisition clerks. VDT-induced symptoms were assessed by means of subject answers to a questionnaire. To measure VDT-induced ocular fatigue objectively, refraction power was determined before and at the end of workshift by an infrared autorefractometer. Job-induced refraction changes were then related to visual complaints and conditions in the workplace. The results confirmed that VDT data-acquisition work can lead to temporary myopia (myopization) in a remarkable percentage of operators; a significant correlation between eye discomfort, ocular asthenopia, and myopization was also found. Illumination levels, luminance, and contrast seem to be of paramount importance regarding visual symptoms: neither asthenopia nor myopization was observed when all of these conditions were adequate. If the ergonomic design of the workplace and the viewing distance are adequate, there are also usually fewer musculoskeletal symptoms. Our results suggest that changes in the ocular refraction status before and at the end of the work-shift, as determined by an automatic refractometer, provide a good objective index of VDT-induced "ocular fatigue", which in our study proved to be significantly related to workplace conditions.
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PMID:Visual fatigue in video display terminal operators: objective measure and relation to environmental conditions. 334 85

This investigation examined the receipt of professional counseling services in response to problems related to stress in one state-wide sample of special education teachers. An analysis of variance was conducted for each stress variable to estimate the significance of mean differences between groups of counseling recipients and nonrecipients. Most comparisons indicated significantly stronger and more frequent stressful experiences for counseling recipients than for nonrecipients with respect to scores on Professional Distress, Emotional Manifestations, Physiological-Fatigue Manifestations, and Total Stress.
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PMID:Occupational stress and receipt of professional counseling in special education. 343 46


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