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

The study investigated the effects of fatigue and task repetition on the relationship between integrated electromyogram and force output during subjective clinical testing of upper extremity muscles. Muscles were studied under two conditions differing in the nature and duration of constant force production (SHORT-F) and (LONG-F). The findings included a significant relationship between force output and integrated EMG, a significant increase in efficiency of muscle activity with task repetition, and significant difference between Force/integrated EMG ratios for muscles labeled "Strong" and "Weak" in the LONG-F condition. This supports Smith's 1974 notion that practice results in increased muscular efficiency. With fatigue, integrated EMG activity increased strongly and functional (force) output of the muscle remained stable or decreased. Fatigue results in a less efficient muscle process. Muscles subjectively testing "Weak" or "Strong" yield effects significantly different from fatigue.
Percept Mot Skills 1995 Jun
PMID:Electromyographic effects of fatigue and task repetition on the validity of estimates of strong and weak muscles in applied kinesiological muscle-testing procedures. 756 18

The influence of depression on the cerebral hemispheric motor functioning of 40 right-handed women, half of whom had been classified as depressed, the other half as nondepressed, was examined. The depressed women were also characterized by elevated state and trait anxiety, suggestive of an anxious-depressive state with heightened arousal. A hand dynamometer was used as a standardized measure of hemispheric motor functioning such as hand-grip strength, perseveration, and fatigue. Primary findings indicated that depressed women displayed significantly less perseveration at the left hand than did nondepressed women, but a nonsignificant trend only was noted for less perseveration at the right hand. These results suggest possible differential arousal of the left and right cerebral hemispheres in this sample of anxious-depressed women and are discussed in terms of arousal theory.
Percept Mot Skills 1994 Jun
PMID:Functional asymmetry in the motor performances of women: neuropsychological effects of depression. 793 60

Limited research indicates positive affective change following acute bouts of exercise, but whether this improved affect among younger subjects may be generalized to older individuals is not known. The present study, then, examined the effects of a single bout of physical activity among older participants. 16 trained women (Mage = 64.5 +/- 7.6 yr.) completed an abbreviated Profile of Mood States prior to and immediately following a 75-min. session of aerobic line dancing. A series of one-way analyses of variance with repeated measures were used to examine differences between pre- and posttest subscores on mood states. Significant decreases following exercise in scores on Tension, Depression, Fatigue, and Anger and a significant increase in scores on Vigor relative to preexercise (control) scores were found. Global mood was significantly improved after the exercise session. No significant difference was found between pre- and postexercise measures of Confusion. Previous findings of significant improvements in affect immediately after an acute bout of exercise may be generalized to older adults. Repetition with a nonexercised control group is desirable.
Percept Mot Skills 1994 Aug
PMID:Mood alterations in older adults following acute exercise. 799 8

This article describes a contact-lens method to sustain asymmetry in visual deprivation and the use of this method to test the general hypothesis that asymmetry in input deprivation can shift activation balance in the integrated brain, differentially influencing lateral hemispheric function. Effects of asymmetrical visual deprivation were as predicted on lateral asymmetry of EEG theta, producing more theta over the deprived hemisphere. Cross-modal influence of such visual deprivation was found in the perception of pleasantness of odors. An interaction was found between side of visual deprivation and performance on verbal reasoning and spatial orientation tasks. A line-bisection test of visual attention was not sensitive to the effects. Fatigue as rated on the Profile of Mood States was greatest when the left hemisphere was deprived.
Percept Mot Skills 1993 Jun
PMID:Asymmetrical visual deprivation: a technique to differentially influence lateral hemispheric function. 833 93

Male Shotokan karate players (karateka) (N = 208) completed the Competitive State Anxiety Inventory-2 and the Profile of Mood States about 40 minutes before a competition. Single-factor multivariate analysis of variance of preperformance mood and anxiety scores indicated significant differences between winning and losing competitors. Winners scored higher on Vigor, Anger, and Self-confidence, and lower on Tension, Depression, Fatigue, Confusion, Cognitive Anxiety, and Somatic Anxiety. Discriminant function analysis showed that 91.96% of participants could be correctly classified as winners or losers on the basis of preperformance mood scores. This figure rose to 93.47% when scores on the anxiety subscales were also included in the discriminant function analysis. Anxiety scores alone produced 78.89% discrimination. Mood profiles for winning karateka were in line with the "mental health" profile of Morgan except for above-average scores on Anger. This result supports the view of McGowan and Miller that anger may facilitate performance in karate competition. The capacity of measures of psychological state to discriminate performance exceeds previous reports, suggesting that karate performance may be exceptionally mood-dependent. These results suggest that interventions which increase scores on Vigor and Anger and reduce scores on Tension, Depression, Fatigue, and Confusion may be particularly efficacious for Shotokan karate performance.
Percept Mot Skills 1995 Aug
PMID:Discriminant effectiveness of psychological state measures in predicting performance outcome in karate competition. 853 68

Soldiers must often carry heavy loads which can lead to symptoms of body soreness, aches, pains, and tiredness. This study assessed symptoms when soldiers carried loads in the standard U.S. Army ALICE pack (a single backpack) and in a prototype Double Pack (a two-pack system designed to alleviate symptoms by evenly distributing the load between a backpack and a frontpack). Each of 15 male soldiers completed a 20-km (12.4 mi) road march while carrying either 34, 48, or 61 kg (75, 105, or 135 lb) and while wearing either the ALICE pack or the Double Pack. Symptoms included feeling alert, good, and wide awake. Postmarch symptoms included tiredness, muscle tightness, and soreness of the legs, feet, back, and shoulders. Analyses of eight symptom factors showed that (a) as load increased, fatigue and muscle discomfort intensified, and alertness and feelings of well-being diminished and (b) distress and heat-illness indices were most intense at 61 kg with the Double Pack.
Percept Mot Skills 1995 Aug
PMID:Symptoms during load carrying: effects of mass and load distribution during a 20-km road march. 853 76

The ability to discriminate grip force was investigated in 30 preschool children aged 5 to 6 years in an experiment controlling for motivation and muscle fatigue. The subjects were required to maintain a relatively high force during the discrimination with forces of the standard stimulus being 1.0, 2.0, and 3.0 kgf. Comparison stimuli changed at an interval of 0.1 kgf. Discrimination was measured in terms of the lower threshold, upper threshold, and interval of uncertainty. Since the statistical analyses indicated that there were no significant gender differences, data for boys and girls were combined. Although the upper and lower thresholds and the interval of uncertainty increased with the force required by the standard stimuli, Weber fractions did not remain constant when the stimulus intensity changed, unlike the findings in previous studies for adults.
Percept Mot Skills 1996 Feb
PMID:Discrimination of grip force for preschool children aged 5 to 6 years. 866 84

The sensitivity of postural responses to the effects of work fatigue and circadian changes was explored in a pilot study using a specific method of multiplate posturography based on the differential assessment of vertical pressure on four separate platforms for each heel and set of toes of each foot, respectively 8 normal subjects, M.D.s, were given six posturographic examinations immediately before and after three 8-hr. work shifts in the emergency room of a major hospital in Tel-Aviv. 3 posturographic measures (stability, spectral power of postural sway at low frequency of 0.1-0.25 Hz, and unilateral weakening of heel-toe synchronisation) were significantly affected by work fatigue whilst also showing interaction with circadian rhythm. 2 additional measures (power of sway at high frequency of 1.00-3.00 Hz and dysharmonic distribution of weight over the four platforms) were not related to workload but showed significant circadian changes. These effects appeared only on positions involving restricted visual and somatosensory feedback causing vestibular stress. Results justify the application of multiplate posturography as an ancillary tool in measuring objectively the effects of fatigue and circadian changes as well as the interaction between endogenous chronobiological processes and their external conditioning factors (Zeitgebers). Pragmatic implications of the findings in the context of industrial medicine and interdisciplinary efforts to prevent road and air accidents are discussed.
Percept Mot Skills 1996 Apr
PMID:An initial evaluation of work fatigue and circadian changes as assessed by multiplate posturography. 872 27

The relationship between visual discomfort (or asthenopia) and different types of work using display units for 10,626 videodisplay terminal operators of the Italian Telecommunication Company was studied. Visual discomfort was evaluated as related to data entry, data checking, word processing, dialogue, enquiry, and various services. Chi-squared indicated that visual discomfort was not significantly related to any particular type of work for subjects with similar amounts of weekly time using videodisplay units. These findings are consistent with earlier results indicating that the main factor determining visual fatigue in VDT operators is the amount of time spent on the display units.
Percept Mot Skills 1996 Jun
PMID:Psychology of computer use: XXXVI. Visual discomfort and different types of work at videodisplay terminals. 877 34

Subjects (N = 60) were randomly assigned to an elated, depressed, or neutral mood-induction condition to assess the effect of mood state on cognitive functioning. In the elated condition film fragments expressing happiness and euphoria were shown. In the depressed condition some frightening and distressing film fragments were presented. The neutral group watched no film. Mood states were measured using the Profile of Mood States, and a Stroop task assessed selective attention. Both were presented by computer. The induction groups differed significantly in the expected direction on the mood subscales Anger, Tension, Depression, Vigour, and Fatigue, and also in the mean scale response times, i.e., slower responses for the depressed condition and faster for the elated one. Differences between conditions were found in the errors on the Stroop: in the depressed condition were the fewest errors and significantly longer error reaction times. Speed of error was associated with self-reported fatigue.
Percept Mot Skills 1997 Apr
PMID:Induced mood and selective attention. 910 34


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