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

Eight cases of fatigue fracture were observed by the authors. In two patients, they presented in metatarsal bones; others were in the lower end of the tibia, in the shaft of the fibula, in the patella, at the upper end of the fibula, in the shaft to the tibia and in the neck of the femur. The main features of these fractues, which occurred in previously intact bones, are reviewed. The role of previous muscle imbalance, or metabolic disturbance, (by age or in pregnancy) is discussed. Good results were obtained by simple immobilization. Surgery may be indicated in the two situations: 1. To eliminate the possibility of a bone tumour by biopsy and, 2. For internal fixation in special sites such as the femoral neck to avoid coxa vara or when healing is very slow, as occurs particularly in the femoral shaft.
Rev Chir Orthop Reparatrice Appar Mot 1977 Dec
PMID:[Fatigue fractures: apropos of 8 cases]. 14 4

Amongst approximately 1 500 spastic children under treatment, the authors have seen three cases of fatigue fracture of the patella. One patient was spastic and two others were athetotic. The fatigue fractures can be explained by a flexed knee gait aggravated by a contracture of the hamstring tendons. No fracture was seen in patients treated by Egger's operation. It is concluded that this procedure both prevents and cures fatigue fracture of the patella.
Rev Chir Orthop Reparatrice Appar Mot 1979 Mar
PMID:[Fatigue fracture of the patella in cerebral palsy (author's transl)]. 15 3

The pupillary light reflex was recorded under control, stress and fatigue conditions for 30 subjects equally divided into groups low, moderate, and high in Neuroticism. The effects of stress were distinguished by a decrease in both latency and extent of pupillary constriction during the initial light stimulation trials, as well as by a greater magnitude of redilation. Latency to maximum constriction and extent of constriction and redilation progressively decreased during the fatigue condition. No differences between Neuroticism groups were observed although it was noted that Neuroticism was negatively correlated with magnitude of redilation during the post-stress condition.
Percept Mot Skills 1979 Oct
PMID:Neuroticism and the effect of stress on the pupillary light reflex. 51 86

Workload is an important factor related to perception of physical fatigue. Because a person engaged in physical activity eventually leading to painful exhaustion is in a pay-off situation, the paradigm of signal detection might be applicable to the perception of differences in load. Two male track and field athletes, aged 22 and 24 yr., participated in two experiments. In Exp. 1 difference threshold were determined with 25%, 50%, 60%, 65% and 70% of VO2 max as basic loads on a bicycle ergometer. Results showed a decreasing k over increasing work loads, contrary to Weber's law. In Exp. 2 a non-parametric signal detection procedure was used, with 25%, 40%, 50% and 60% of VO2 max as noise levels and a signal intensity of 1.5 watt in every condition. A chi 2 test for a 2-factor design showed only an effect of noise level. The converging results of both experiments led to the conclusion of a relative increasing sensitivity across increasing work loads. The main goal for future research will be to develop the signal detection method as a framework for research on fatigue.
Percept Mot Skills 1978 Jun
PMID:Physical fatigue and the perception of differences in load: a signal detection approach. 67 33

Sustaining an isometric contraction at a percentage of maximum contraction value prior to fatigue is significantly longer for the dominant arm than the non-dominant arm as reanalysis of data shows. This peripheral motor parameter which differentiates handedness as reflected in motoneuron pools may clarify the relationship between contralateral motor function and functional cerebral lateralizations.
Percept Mot Skills 1978 Dec
PMID:Duration of task: an indicator of differentiation between motoneuron pools. 74 Apr 68

The present study was designed to investigate the effects of exercise to exhaustion on different components of visual capacity: visual field, and coincidence/anticipation capacity. 16 male subjects were first familiarized with the three visual tests, one day before being submitted to a prefatigue visual test. Metabolic fatigue was induced by working to exhaustion on a bicycle ergometer. Once fatigued, all subjects undertook the visual tests. Pre- and post-fatigue visual measurements were not significantly different. The results demonstrated the independence between metabolic fatigue and visual capacity.
Percept Mot Skills 1978 Dec
PMID:Influence of imposed metabolic fatigue on visual capacity components. 74 14

There is evidence for discrete property analyzers in mammalian visual systems. Research has indicated that prolonged stimulation of such units reduces their sensitivity to subsequent stimulation. Psychophysical studies have employed this effect, terned selective adaptation, to study feature extractors in the human visual system. The purpose of this study was to determine the role of density and deviation in the adaptation figure on the recognition thresholds of simple and complex text figures. A selective adaptation paradigm was employed. A strict property analyzer model suggests that increases in density, deviation, or complexity should lead to an increased recognition time for the test figures. This was not confirmed. The complexity of the test figure had no effect on its recognition time. Both increased density and deviation did have an effect on the recognition times of the test figures. The results thus suggest that contour adaptation involves at least two processes: a general, probably peripheral effect due to the fatigue of visual receptor units and a more specific effect generated by the similarity between test figure and adaptation contours, independent of the site of stimulation.
Percept Mot Skills 1977 Apr
PMID:Specific and general contour adaptation effects found using a selective adaptation paradigm. 86 61

Although numerous studies have investigated the diagnostic effectiveness of the Speech Sounds Perception Tests, few have investigated the qualities of the test make it effective. Different writers have suggested that it may be effective because of interference from earlier syllables and items, an inability to understand speech, fatigue or an inability to match letters and sounds. If the effectiveness is due to fatigue or interference, the lengh of the test (60 items) would contribute to its accuracy. Otherwise, a short form of the test could be as effective. Data from 37 brain-damaged and 21 normal individuals indicated that a 30-item version of the test was slightly more accurate diagnostically than the 60-item form. This suggests that a short form of the test could be used without sacrificing diagnostic accuracy, enabling the clinician to save time in assessing neuropsychological patients.
Percept Mot Skills 1977 Oct
PMID:Short form of the Speech Sounds Perception Test. 91 3

This investigation was designed for the purpose of ascertaining if one muscle group (dorsi flexors, abdominals, plantar flexors, or knee and hip flexors and extensors) could be identified which most significantly affects dynamic balance. The dependent variable was the dynabalometer. Subjects were 100 male volunteers, between the ages of 19 and 25 yr. Subjects were randomly assigned to a control or 1 of 4 treatment groups. Testing was counterbalanced over time and day. Controls had a practice period and 3 performance trials; other Ss had a practice period, localized fatigue of a muscle group followed by 3 performance trials. Analysis of variance indicated a significant difference between treatment groups (F = 312.09, p less than .01). Multiple comparisons of treatment means showed that only one muscle group, the knee and hip flexors and extensors, differed significantly from all other groups (q = 4.75, p less than .01). Results indicate strongly that the knee and hip flexors and extensors can be considered a most important muscle group for performance by ordinary male college students on the dynabalometer.
Percept Mot Skills 1976 Feb
PMID:Localized muscle fatigue and dynamic balance. 94 58

This investigation was designed to determine the relationship between the tactual two-point threshold and the two-point supraliminal difference limen. The yes/no method was employed and three localities were tested. The results confirmed the hypothesis that as the initial two-point threshold increases, the two-point supraliminal difference limen also increases. No significant differences were obtained between the right and the left sides of each body area tested and only on the hand was a reliable difference obtained between the first 9 and second 9 sessions. This difference was interpreted in terms of a peripheral fatigue phenomenon.
Percept Mot Skills 1976 Aug
PMID:A signal-detection determination of the two-point supraliminal difference limen on three different body areas. 95 13


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