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

Flights aboard modern vehicles are associated with high nervous-emotional and physical stresses. This may induce depletion of reserve capabilities, development of fatigue and, consequently, reduction of work capacity of crewmembers. The paper discusses approaches and results of the use of drugs by pilots and cosmonauts in order to alleviate their fatigue and emotional stress. It gives indications and contraindications for the adminstration of stimulants and tranquilizers. On the basis of a comprehensive analysis of the literature data and their own findings, the authors draw the conclusion that the use of stimulants and anxiolytics may increase the level of reliability and performance of air- and spacecraft pilots during programmed and, particularly, contigent situations of the flight.
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PMID:[Psychopharmacology in aviation and astronautics]. 1 70

The purpose of the study is to evaluate mental loading due to working activities in two occupational groups--flight managers and punching machine operators. Changes in residual mental capacity are studied in relation to character of the specific work performed and working conditions. Residual capacity changes, measured with the method of double task assignment, disclose an essential difference in the nature of labour inherent of the two professions under study. The increased quantity of tasks performed under normal conditions of work exerts less influence on the level of residual mental capacity than work assignments fulfilled under complicated situations (such as bad weather conditions and the like). The level of residual mental capacity is likewise altered under the effect of fatigue in the course of the working day.
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PMID:[Assessment of the mental load of flight managers and of perforating machine operators by means of measuring the residual mental capacity via the subsidiary task method]. 1 58

Nineteen men, aged 41-64 years, with stable angina pectoris have completed a random double-blind study of atenolol, 50 mg b.i.d., atenolol, 100 mg b.i.d., and placebo. Fifteen patients had subjective improvement on atenolol, two were unchanged and two felt worse (because of asthenia/leg fatigue). No significant placebo effect was found. On both atenolol dosages there were highly significant reductions in heart rate at rest and during exercise and in BP. Only the maximal heart rate decreased significantly more on 100 mg atenolol than on 50 mg (p less than 0.01). Fourteen patients had the same or a better physical performance on the 50 mg b.i.d. regimen than on the 100 mg b.i.d. regimen, although this difference was not significant. Sixteen patients had higher bicycle exercise performance on atenolol than on placebo. Disregarding the three non-responders, a mean increase of 44% in bicycle performance was found. No serious side-effects were seen. Most individuals reported an increased feeling of well-being on atenolol.
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PMID:Atenolol in the treatment of angina pectoris. 1 96

A nonblind clinical study was carried out by administering Lorazepam at a low dosage to patients with a light to moderate state of reactive anxiety. The drug was shown to be effective in the management of the target symptoms studied: anorexia, sleep induction, rhythm, and duration disturbances, depression, irritability and moodiness, fatigue, anxiety and tension, somatic anxiety, social adaptation. The results obtained are practically identical to those reported in the literature for higher doses. Moreover, low-dose Lorazepam was well tolerated and without undesired side-effects.
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PMID:[Use of an anxiolytic agent (lorazepam) in low doses in the treatment of anxiety states]. 1 89

A double-blind between-patient trial over 6 weeks to compare the effects of 1.6 g tolmetin daily with 4 g alclofenac daily was completed by 37 out of 44 out-patients with rheumatoid arthritis. Tolmetin proved as effective as alclofenac in relieving pain and in reducing both the articular index score and the number of inflamed joints. However, alclofenac produced a significantly greater reduction in the duration of morning stiffness, which could have been related to the timing of the initial daily dose of tolmetin. Onset of fatigue was significantly improved by both drugs. Neither treatment group exhibited any significant changes in the serum levels of IgG, IgA, and IgM, nor in the latex and sheep-cell agglutination titres. Although neither drug gave rise to serious side-effects, 3 patients (2 on tolmetin, 1 on alclofenac) were withdrawn because of skin rash, 2 (on tolmetin) because of gastro-intestinal upsets, and 1 from each group because of lack of analgesic effects.
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PMID:Treatment of rheumatoid arthritis with tolmetin: a comparison with alclofenac. 1 5

Fourteen rested and fatigued residents read a set of 25 test radiographs on two separate occasions approximately one month apart. The radiographs were made with partial chest phantom using pulmonary nodules as test objects. Seven rested and 7 fatigued residents read the radiographs, and a month later the order of fatigue was reversed. Fatigued residents had worked a minimum of 15 consecutive hours before their interpretations. Performance did not deteriorate with fatigue, and the nodule detection rate was almost identical on both occasions.
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PMID:The effect of fatigue on resident performance. 1 11

Investigated auditory word discrimination skill in children diagnosed as having minimal brain dysfunction (MBD), a heretofore unexplored topic in the study of MBD. A lack of auditory discrimination skill seems relevant to learning deficiency in language acquisition, a typical sign of MBD. The present study tested the hypothesis that phonemic aural discriminations would be difficult to make for boys diagnosed as having MBD. Errors and nonresponses made while Ss performed an extended auditory word discrimination task were compared between a group of 26 boys diagnosed as having MBD and a matched normal group. As expected, the MBD group had a significantly higher error rate than the normal group even when Ss were discriminating easy word pairs composed of dissimilar items (e.g., reading, math). These and other results suggested that the MBD group was very susceptible to fatigue even while motivated to perform well and while able to improve with practice. The relatively inferior performance of the MBD group was interpreted as resulting directly from a lack of auditory discrimination skill and indirectly from fatigue and its accompanying attention loss.
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PMID:Auditory word discrimination in male children diagnosed as having minimal brain dysfunction. 2 90

Studies of the effect of induced mood on the autonomic nervous system (ANS) suggested that naturally occurring mood might also covary with the ANS. Ss were 13 men and women aged 20 to 70. Fatigue, confusion, and depression were measured on the Profile of Mood States, while barometric pressure and the ANS indices of heart rate and body temperature were also recorded. Fatigue and confusion each showed negative relationships to both heart rate and body temperature. Barometric pressure showed a suggestively positive relationship to the mood of depression. Hypothalamic serotonin concentration was suggested as a central factor producing the covariations between the mood indices (alertness and clear thinking) and the ANS measures.
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PMID:Alertness and clear thinking as characteristics of high naturally occurring autonomic nervous system arousal. 2 43

Four causes of flying accidents due to human factors are discussed: physical and psycological unfitness, insufficient physical and psychological training, and flight fatigue. Ways in which these factors can be eliminated or their effects diminished are indicated, including the establishment of a national aeronautical health service manned by physicians specialising in aerospace medicine.
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PMID:[The human factor as a cause of flight accidents]. 2 7

The interaction of anxiety and autonomic activation as a factor in the development and persistency of pathological anxiety was investigated with the aid of self-rating procedures and a habituation experiment. The state of activation was varied systematically in 40 normal subjects by various experimental conditions and by the administration of a tranquilizer. The degree of anxiety and activation were able to be differentiated in the investigated range of mean attentiveness. Anxious expectancy is perceived in particular as subjective anxiety. Fatigue and sedation, on the other hand, demonstrate subjective and autonomic desactivation. Corresponding differences can be demonstrated for the anxiolytic and sedative effects of tranquilizers. The time course of habituation is a more exact indicator than the amplitude of the orienting response. Cognitively provoked apprehensiveness, thus, appears to be qualitatively different as compared to psychoautonomically caused anxieties of psychiatric disorders.
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PMID:Anxiety, arousal, and autonomic habituation. 2 31


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